1706 lines
47 KiB
Text
1706 lines
47 KiB
Text
-- Date functions for use by other modules.
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-- I18N and time zones are not supported.
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local MINUS = '−' -- Unicode U+2212 MINUS SIGN
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local floor = math.floor
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local Date, DateDiff, diffmt -- forward declarations
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local uniq = { 'unique identifier' }
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local function is_date(t)
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-- The system used to make a date read-only means there is no unique
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-- metatable that is conveniently accessible to check.
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return type(t) == 'table' and t._id == uniq
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end
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local function is_diff(t)
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return type(t) == 'table' and getmetatable(t) == diffmt
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end
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local function _list_join(list, sep)
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return table.concat(list, sep)
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end
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local function collection()
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-- Return a table to hold items.
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return {
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n = 0,
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add = function (self, item)
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self.n = self.n + 1
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self[self.n] = item
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end,
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join = _list_join,
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}
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end
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local function strip_to_nil(text)
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-- If text is a string, return its trimmed content, or nil if empty.
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-- Otherwise return text (convenient when Date fields are provided from
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-- another module which may pass a string, a number, or another type).
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if type(text) == 'string' then
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text = text:match('(%S.-)%s*$')
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end
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return text
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end
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local function is_leap_year(year, calname)
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-- Return true if year is a leap year.
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if calname == 'Julian' then
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return year % 4 == 0
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end
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return (year % 4 == 0 and year % 100 ~= 0) or year % 400 == 0
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end
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local function days_in_month(year, month, calname)
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-- Return number of days (1..31) in given month (1..12).
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if month == 2 and is_leap_year(year, calname) then
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return 29
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end
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return ({ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 })[month]
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end
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local function h_m_s(time)
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-- Return hour, minute, second extracted from fraction of a day.
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time = floor(time * 24 * 3600 + 0.5) -- number of seconds
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local second = time % 60
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time = floor(time / 60)
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return floor(time / 60), time % 60, second
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end
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local function hms(date)
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-- Return fraction of a day from date's time, where (0 <= fraction < 1)
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-- if the values are valid, but could be anything if outside range.
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return (date.hour + (date.minute + date.second / 60) / 60) / 24
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end
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local function julian_date(date)
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-- Return jd, jdz from a Julian or Gregorian calendar date where
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-- jd = Julian date and its fractional part is zero at noon
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-- jdz = same, but assume time is 00:00:00 if no time given
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-- http://www.tondering.dk/claus/cal/julperiod.php#formula
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-- Testing shows this works for all dates from year -9999 to 9999!
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-- JDN 0 is the 24-hour period starting at noon UTC on Monday
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-- 1 January 4713 BC = (-4712, 1, 1) Julian calendar
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-- 24 November 4714 BC = (-4713, 11, 24) Gregorian calendar
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local offset
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local a = floor((14 - date.month)/12)
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local y = date.year + 4800 - a
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if date.calendar == 'Julian' then
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offset = floor(y/4) - 32083
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else
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offset = floor(y/4) - floor(y/100) + floor(y/400) - 32045
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end
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local m = date.month + 12*a - 3
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local jd = date.day + floor((153*m + 2)/5) + 365*y + offset
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if date.hastime then
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jd = jd + hms(date) - 0.5
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return jd, jd
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end
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return jd, jd - 0.5
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end
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local function set_date_from_jd(date)
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-- Set the fields of table date from its Julian date field.
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-- Return true if date is valid.
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-- http://www.tondering.dk/claus/cal/julperiod.php#formula
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-- This handles the proleptic Julian and Gregorian calendars.
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-- Negative Julian dates are not defined but they work.
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local calname = date.calendar
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local low, high -- min/max limits for date ranges −9999-01-01 to 9999-12-31
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if calname == 'Gregorian' then
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low, high = -1930999.5, 5373484.49999
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elseif calname == 'Julian' then
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low, high = -1931076.5, 5373557.49999
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else
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return
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end
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local jd = date.jd
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if not (type(jd) == 'number' and low <= jd and jd <= high) then
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return
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end
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local jdn = floor(jd)
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if date.hastime then
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local time = jd - jdn -- 0 <= time < 1
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if time >= 0.5 then -- if at or after midnight of next day
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jdn = jdn + 1
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time = time - 0.5
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else
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time = time + 0.5
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end
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date.hour, date.minute, date.second = h_m_s(time)
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else
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date.second = 0
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date.minute = 0
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date.hour = 0
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end
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local b, c
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if calname == 'Julian' then
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b = 0
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c = jdn + 32082
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else -- Gregorian
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local a = jdn + 32044
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b = floor((4*a + 3)/146097)
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c = a - floor(146097*b/4)
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end
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local d = floor((4*c + 3)/1461)
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local e = c - floor(1461*d/4)
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local m = floor((5*e + 2)/153)
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date.day = e - floor((153*m + 2)/5) + 1
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date.month = m + 3 - 12*floor(m/10)
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date.year = 100*b + d - 4800 + floor(m/10)
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return true
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end
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local function fix_numbers(numbers, y, m, d, H, M, S, partial, hastime, calendar)
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-- Put the result of normalizing the given values in table numbers.
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-- The result will have valid m, d values if y is valid; caller checks y.
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-- The logic of PHP mktime is followed where m or d can be zero to mean
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-- the previous unit, and -1 is the one before that, etc.
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-- Positive values carry forward.
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local date
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if not (1 <= m and m <= 12) then
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date = Date(y, 1, 1)
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if not date then return end
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date = date + ((m - 1) .. 'm')
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y, m = date.year, date.month
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end
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local days_hms
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if not partial then
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if hastime and H and M and S then
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if not (0 <= H and H <= 23 and
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0 <= M and M <= 59 and
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0 <= S and S <= 59) then
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days_hms = hms({ hour = H, minute = M, second = S })
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end
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end
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if days_hms or not (1 <= d and d <= days_in_month(y, m, calendar)) then
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date = date or Date(y, m, 1)
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if not date then return end
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date = date + (d - 1 + (days_hms or 0))
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y, m, d = date.year, date.month, date.day
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if days_hms then
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H, M, S = date.hour, date.minute, date.second
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end
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end
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end
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numbers.year = y
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numbers.month = m
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numbers.day = d
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if days_hms then
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-- Don't set H unless it was valid because a valid H will set hastime.
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numbers.hour = H
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numbers.minute = M
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numbers.second = S
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end
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end
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local function set_date_from_numbers(date, numbers, options)
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-- Set the fields of table date from numeric values.
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-- Return true if date is valid.
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if type(numbers) ~= 'table' then
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return
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end
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local y = numbers.year or date.year
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local m = numbers.month or date.month
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local d = numbers.day or date.day
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local H = numbers.hour
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local M = numbers.minute or date.minute or 0
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local S = numbers.second or date.second or 0
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local need_fix
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if y and m and d then
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date.partial = nil
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if not (-9999 <= y and y <= 9999 and
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1 <= m and m <= 12 and
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1 <= d and d <= days_in_month(y, m, date.calendar)) then
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if not date.want_fix then
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return
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end
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need_fix = true
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end
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elseif y and date.partial then
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if d or not (-9999 <= y and y <= 9999) then
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return
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end
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if m and not (1 <= m and m <= 12) then
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if not date.want_fix then
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return
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end
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need_fix = true
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end
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else
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return
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end
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if date.partial then
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H = nil -- ignore any time
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M = nil
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S = nil
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else
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if H then
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-- It is not possible to set M or S without also setting H.
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date.hastime = true
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else
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H = 0
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end
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if not (0 <= H and H <= 23 and
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0 <= M and M <= 59 and
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0 <= S and S <= 59) then
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if date.want_fix then
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need_fix = true
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else
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return
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end
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end
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end
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date.want_fix = nil
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if need_fix then
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fix_numbers(numbers, y, m, d, H, M, S, date.partial, date.hastime, date.calendar)
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return set_date_from_numbers(date, numbers, options)
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end
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date.year = y -- -9999 to 9999 ('n BC' → year = 1 - n)
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date.month = m -- 1 to 12 (may be nil if partial)
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date.day = d -- 1 to 31 (* = nil if partial)
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date.hour = H -- 0 to 59 (*)
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date.minute = M -- 0 to 59 (*)
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date.second = S -- 0 to 59 (*)
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if type(options) == 'table' then
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for _, k in ipairs({ 'am', 'era', 'format' }) do
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if options[k] then
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date.options[k] = options[k]
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end
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end
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end
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return true
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end
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local function make_option_table(options1, options2)
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-- If options1 is a string, return a table with its settings, or
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-- if it is a table, use its settings.
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-- Missing options are set from table options2 or defaults.
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-- If a default is used, a flag is set so caller knows the value was not intentionally set.
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-- Valid option settings are:
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-- am: 'am', 'a.m.', 'AM', 'A.M.'
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-- 'pm', 'p.m.', 'PM', 'P.M.' (each has same meaning as corresponding item above)
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-- era: 'BCMINUS', 'BCNEGATIVE', 'BC', 'B.C.', 'BCE', 'B.C.E.', 'AD', 'A.D.', 'CE', 'C.E.'
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-- Option am = 'am' does not mean the hour is AM; it means 'am' or 'pm' is used, depending on the hour,
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-- and am = 'pm' has the same meaning.
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-- Similarly, era = 'BC' means 'BC' is used if year <= 0.
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-- BCMINUS displays a MINUS if year < 0 and the display format does not include %{era}.
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-- BCNEGATIVE is similar but displays a hyphen.
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local result = { bydefault = {} }
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if type(options1) == 'table' then
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result.am = options1.am
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result.era = options1.era
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elseif type(options1) == 'string' then
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-- Example: 'am:AM era:BC' or 'am=AM era=BC'.
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for item in options1:gmatch('%S+') do
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local lhs, rhs = item:match('^(%w+)[:=](.+)$')
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if lhs then
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result[lhs] = rhs
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end
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end
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end
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options2 = type(options2) == 'table' and options2 or {}
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local defaults = { am = 'am', era = 'BC' }
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for k, v in pairs(defaults) do
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if not result[k] then
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if options2[k] then
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result[k] = options2[k]
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else
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result[k] = v
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result.bydefault[k] = true
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end
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end
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end
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return result
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end
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local ampm_options = {
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-- lhs = input text accepted as an am/pm option
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-- rhs = code used internally
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['am'] = 'am',
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['AM'] = 'AM',
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['a.m.'] = 'a.m.',
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['A.M.'] = 'A.M.',
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['pm'] = 'am', -- same as am
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['PM'] = 'AM',
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['p.m.'] = 'a.m.',
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['P.M.'] = 'A.M.',
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}
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local era_text = {
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-- Text for displaying an era with a positive year (after adjusting
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-- by replacing year with 1 - year if date.year <= 0).
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-- options.era = { year<=0 , year>0 }
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['BCMINUS'] = { 'BC' , '' , isbc = true, sign = MINUS },
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['BCNEGATIVE'] = { 'BC' , '' , isbc = true, sign = '-' },
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['BC'] = { 'BC' , '' , isbc = true },
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['B.C.'] = { 'B.C.' , '' , isbc = true },
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['BCE'] = { 'BCE' , '' , isbc = true },
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['B.C.E.'] = { 'B.C.E.', '' , isbc = true },
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['AD'] = { 'BC' , 'AD' },
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['A.D.'] = { 'B.C.' , 'A.D.' },
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['CE'] = { 'BCE' , 'CE' },
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['C.E.'] = { 'B.C.E.', 'C.E.' },
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}
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local function get_era_for_year(era, year)
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return (era_text[era] or era_text['BC'])[year > 0 and 2 or 1] or ''
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end
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local function strftime(date, format, options)
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-- Return date formatted as a string using codes similar to those
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-- in the C strftime library function.
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local sformat = string.format
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local shortcuts = {
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['%c'] = '%-I:%M %p %-d %B %-Y %{era}', -- date and time: 2:30 pm 1 April 2016
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['%x'] = '%-d %B %-Y %{era}', -- date: 1 April 2016
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['%X'] = '%-I:%M %p', -- time: 2:30 pm
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}
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if shortcuts[format] then
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format = shortcuts[format]
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end
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local codes = {
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a = { field = 'dayabbr' },
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A = { field = 'dayname' },
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b = { field = 'monthabbr' },
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B = { field = 'monthname' },
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u = { fmt = '%d' , field = 'dowiso' },
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w = { fmt = '%d' , field = 'dow' },
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d = { fmt = '%02d', fmt2 = '%d', field = 'day' },
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m = { fmt = '%02d', fmt2 = '%d', field = 'month' },
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Y = { fmt = '%04d', fmt2 = '%d', field = 'year' },
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H = { fmt = '%02d', fmt2 = '%d', field = 'hour' },
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M = { fmt = '%02d', fmt2 = '%d', field = 'minute' },
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S = { fmt = '%02d', fmt2 = '%d', field = 'second' },
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j = { fmt = '%03d', fmt2 = '%d', field = 'dayofyear' },
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I = { fmt = '%02d', fmt2 = '%d', field = 'hour', special = 'hour12' },
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p = { field = 'hour', special = 'am' },
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}
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options = make_option_table(options, date.options)
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local amopt = options.am
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local eraopt = options.era
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local function replace_code(spaces, modifier, id)
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local code = codes[id]
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if code then
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local fmt = code.fmt
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if modifier == '-' and code.fmt2 then
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fmt = code.fmt2
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end
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local value = date[code.field]
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if not value then
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return nil -- an undefined field in a partial date
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end
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local special = code.special
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if special then
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if special == 'hour12' then
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value = value % 12
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value = value == 0 and 12 or value
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elseif special == 'am' then
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local ap = ({
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['a.m.'] = { 'a.m.', 'p.m.' },
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['AM'] = { 'AM', 'PM' },
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['A.M.'] = { 'A.M.', 'P.M.' },
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})[ampm_options[amopt]] or { 'am', 'pm' }
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return (spaces == '' and '' or ' ') .. (value < 12 and ap[1] or ap[2])
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end
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end
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if code.field == 'year' then
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local sign = (era_text[eraopt] or {}).sign
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if not sign or format:find('%{era}', 1, true) then
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sign = ''
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if value <= 0 then
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value = 1 - value
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end
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else
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if value >= 0 then
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sign = ''
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else
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value = -value
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end
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end
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return spaces .. sign .. sformat(fmt, value)
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end
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return spaces .. (fmt and sformat(fmt, value) or value)
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end
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end
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local function replace_property(spaces, id)
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if id == 'era' then
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-- Special case so can use local era option.
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local result = get_era_for_year(eraopt, date.year)
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if result == '' then
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return ''
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end
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return (spaces == '' and '' or ' ') .. result
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end
|
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local result = date[id]
|
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if type(result) == 'string' then
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return spaces .. result
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end
|
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if type(result) == 'number' then
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return spaces .. tostring(result)
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end
|
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if type(result) == 'boolean' then
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return spaces .. (result and '1' or '0')
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end
|
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-- This occurs if id is an undefined field in a partial date, or is the name of a function.
|
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return nil
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end
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local PERCENT = '\127PERCENT\127'
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return (format
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:gsub('%%%%', PERCENT)
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:gsub('(%s*)%%{(%w+)}', replace_property)
|
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:gsub('(%s*)%%(%-?)(%a)', replace_code)
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:gsub(PERCENT, '%%')
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)
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end
|
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|
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local function _date_text(date, fmt, options)
|
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-- Return a formatted string representing the given date.
|
||
if not is_date(date) then
|
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error('date:text: need a date (use "date:text()" with a colon)', 2)
|
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end
|
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if type(fmt) == 'string' and fmt:match('%S') then
|
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if fmt:find('%', 1, true) then
|
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return strftime(date, fmt, options)
|
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end
|
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elseif date.partial then
|
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fmt = date.month and 'my' or 'y'
|
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else
|
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fmt = 'dmy'
|
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if date.hastime then
|
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fmt = (date.second > 0 and 'hms ' or 'hm ') .. fmt
|
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end
|
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end
|
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local function bad_format()
|
||
-- For consistency with other format processing, return given format
|
||
-- (or cleaned format if original was not a string) if invalid.
|
||
return mw.text.nowiki(fmt)
|
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end
|
||
if date.partial then
|
||
-- Ignore days in standard formats like 'ymd'.
|
||
if fmt == 'ym' or fmt == 'ymd' then
|
||
fmt = date.month and '%Y-%m %{era}' or '%Y %{era}'
|
||
elseif fmt == 'my' or fmt == 'dmy' or fmt == 'mdy' then
|
||
fmt = date.month and '%B %-Y %{era}' or '%-Y %{era}'
|
||
elseif fmt == 'y' then
|
||
fmt = date.month and '%-Y %{era}' or '%-Y %{era}'
|
||
else
|
||
return bad_format()
|
||
end
|
||
return strftime(date, fmt, options)
|
||
end
|
||
local function hm_fmt()
|
||
local plain = make_option_table(options, date.options).bydefault.am
|
||
return plain and '%H:%M' or '%-I:%M %p'
|
||
end
|
||
local need_time = date.hastime
|
||
local t = collection()
|
||
for item in fmt:gmatch('%S+') do
|
||
local f
|
||
if item == 'hm' then
|
||
f = hm_fmt()
|
||
need_time = false
|
||
elseif item == 'hms' then
|
||
f = '%H:%M:%S'
|
||
need_time = false
|
||
elseif item == 'ymd' then
|
||
f = '%Y-%m-%d %{era}'
|
||
elseif item == 'mdy' then
|
||
f = '%B %-d, %-Y %{era}'
|
||
elseif item == 'dmy' then
|
||
f = '%-d %B %-Y %{era}'
|
||
else
|
||
return bad_format()
|
||
end
|
||
t:add(f)
|
||
end
|
||
fmt = t:join(' ')
|
||
if need_time then
|
||
fmt = hm_fmt() .. ' ' .. fmt
|
||
end
|
||
return strftime(date, fmt, options)
|
||
end
|
||
|
||
local day_info = {
|
||
-- 0=Sun to 6=Sat
|
||
[0] = { 'Sun', 'Sunday' },
|
||
{ 'Mon', 'Monday' },
|
||
{ 'Tue', 'Tuesday' },
|
||
{ 'Wed', 'Wednesday' },
|
||
{ 'Thu', 'Thursday' },
|
||
{ 'Fri', 'Friday' },
|
||
{ 'Sat', 'Saturday' },
|
||
}
|
||
|
||
local month_info = {
|
||
-- 1=Jan to 12=Dec
|
||
{ 'Jan', 'January' },
|
||
{ 'Feb', 'February' },
|
||
{ 'Mar', 'March' },
|
||
{ 'Apr', 'April' },
|
||
{ 'May', 'May' },
|
||
{ 'Jun', 'June' },
|
||
{ 'Jul', 'July' },
|
||
{ 'Aug', 'August' },
|
||
{ 'Sep', 'September' },
|
||
{ 'Oct', 'October' },
|
||
{ 'Nov', 'November' },
|
||
{ 'Dec', 'December' },
|
||
}
|
||
|
||
local function name_to_number(text, translate)
|
||
if type(text) == 'string' then
|
||
return translate[text:lower()]
|
||
end
|
||
end
|
||
|
||
local function day_number(text)
|
||
return name_to_number(text, {
|
||
sun = 0, sunday = 0,
|
||
mon = 1, monday = 1,
|
||
tue = 2, tuesday = 2,
|
||
wed = 3, wednesday = 3,
|
||
thu = 4, thursday = 4,
|
||
fri = 5, friday = 5,
|
||
sat = 6, saturday = 6,
|
||
})
|
||
end
|
||
|
||
local function month_number(text)
|
||
return name_to_number(text, {
|
||
jan = 1, january = 1,
|
||
feb = 2, february = 2,
|
||
mar = 3, march = 3,
|
||
apr = 4, april = 4,
|
||
may = 5,
|
||
jun = 6, june = 6,
|
||
jul = 7, july = 7,
|
||
aug = 8, august = 8,
|
||
sep = 9, september = 9, sept = 9,
|
||
oct = 10, october = 10,
|
||
nov = 11, november = 11,
|
||
dec = 12, december = 12,
|
||
})
|
||
end
|
||
|
||
local function _list_text(list, fmt)
|
||
-- Return a list of formatted strings from a list of dates.
|
||
if not type(list) == 'table' then
|
||
error('date:list:text: need "list:text()" with a colon', 2)
|
||
end
|
||
local result = { join = _list_join }
|
||
for i, date in ipairs(list) do
|
||
result[i] = date:text(fmt)
|
||
end
|
||
return result
|
||
end
|
||
|
||
local function _date_list(date, spec)
|
||
-- Return a possibly empty numbered table of dates meeting the specification.
|
||
-- Dates in the list are in ascending order (oldest date first).
|
||
-- The spec should be a string of form "<count> <day> <op>"
|
||
-- where each item is optional and
|
||
-- count = number of items wanted in list
|
||
-- day = abbreviation or name such as Mon or Monday
|
||
-- op = >, >=, <, <= (default is > meaning after date)
|
||
-- If no count is given, the list is for the specified days in date's month.
|
||
-- The default day is date's day.
|
||
-- The spec can also be a positive or negative number:
|
||
-- -5 is equivalent to '5 <'
|
||
-- 5 is equivalent to '5' which is '5 >'
|
||
if not is_date(date) then
|
||
error('date:list: need a date (use "date:list()" with a colon)', 2)
|
||
end
|
||
local list = { text = _list_text }
|
||
if date.partial then
|
||
return list
|
||
end
|
||
local count, offset, operation
|
||
local ops = {
|
||
['>='] = { before = false, include = true },
|
||
['>'] = { before = false, include = false },
|
||
['<='] = { before = true , include = true },
|
||
['<'] = { before = true , include = false },
|
||
}
|
||
if spec then
|
||
if type(spec) == 'number' then
|
||
count = floor(spec + 0.5)
|
||
if count < 0 then
|
||
count = -count
|
||
operation = ops['<']
|
||
end
|
||
elseif type(spec) == 'string' then
|
||
local num, day, op = spec:match('^%s*(%d*)%s*(%a*)%s*([<>=]*)%s*$')
|
||
if not num then
|
||
return list
|
||
end
|
||
if num ~= '' then
|
||
count = tonumber(num)
|
||
end
|
||
if day ~= '' then
|
||
local dow = day_number(day:gsub('[sS]$', '')) -- accept plural days
|
||
if not dow then
|
||
return list
|
||
end
|
||
offset = dow - date.dow
|
||
end
|
||
operation = ops[op]
|
||
else
|
||
return list
|
||
end
|
||
end
|
||
offset = offset or 0
|
||
operation = operation or ops['>']
|
||
local datefrom, dayfirst, daylast
|
||
if operation.before then
|
||
if offset > 0 or (offset == 0 and not operation.include) then
|
||
offset = offset - 7
|
||
end
|
||
if count then
|
||
if count > 1 then
|
||
offset = offset - 7*(count - 1)
|
||
end
|
||
datefrom = date + offset
|
||
else
|
||
daylast = date.day + offset
|
||
dayfirst = daylast % 7
|
||
if dayfirst == 0 then
|
||
dayfirst = 7
|
||
end
|
||
end
|
||
else
|
||
if offset < 0 or (offset == 0 and not operation.include) then
|
||
offset = offset + 7
|
||
end
|
||
if count then
|
||
datefrom = date + offset
|
||
else
|
||
dayfirst = date.day + offset
|
||
daylast = date.monthdays
|
||
end
|
||
end
|
||
if not count then
|
||
if daylast < dayfirst then
|
||
return list
|
||
end
|
||
count = floor((daylast - dayfirst)/7) + 1
|
||
datefrom = Date(date, {day = dayfirst})
|
||
end
|
||
for i = 1, count do
|
||
if not datefrom then break end -- exceeds date limits
|
||
list[i] = datefrom
|
||
datefrom = datefrom + 7
|
||
end
|
||
return list
|
||
end
|
||
|
||
-- A table to get the current date/time (UTC), but only if needed.
|
||
local current = setmetatable({}, {
|
||
__index = function (self, key)
|
||
local d = os.date('!*t')
|
||
self.year = d.year
|
||
self.month = d.month
|
||
self.day = d.day
|
||
self.hour = d.hour
|
||
self.minute = d.min
|
||
self.second = d.sec
|
||
return rawget(self, key)
|
||
end })
|
||
|
||
local function extract_date(newdate, text)
|
||
-- Parse the date/time in text and return n, o where
|
||
-- n = table of numbers with date/time fields
|
||
-- o = table of options for AM/PM or AD/BC or format, if any
|
||
-- or return nothing if date is known to be invalid.
|
||
-- Caller determines if the values in n are valid.
|
||
-- A year must be positive ('1' to '9999'); use 'BC' for BC.
|
||
-- In a y-m-d string, the year must be four digits to avoid ambiguity
|
||
-- ('0001' to '9999'). The only way to enter year <= 0 is by specifying
|
||
-- the date as three numeric parameters like ymd Date(-1, 1, 1).
|
||
-- Dates of form d/m/y, m/d/y, y/m/d are rejected as potentially ambiguous.
|
||
local date, options = {}, {}
|
||
if text:sub(-1) == 'Z' then
|
||
-- Extract date/time from a Wikidata timestamp.
|
||
-- The year can be 1 to 16 digits but this module handles 1 to 4 digits only.
|
||
-- Examples: '+2016-06-21T14:30:00Z', '-0000000180-00-00T00:00:00Z'.
|
||
local sign, y, m, d, H, M, S = text:match('^([+%-])(%d+)%-(%d%d)%-(%d%d)T(%d%d):(%d%d):(%d%d)Z$')
|
||
if sign then
|
||
y = tonumber(y)
|
||
if sign == '-' and y > 0 then
|
||
y = -y
|
||
end
|
||
if y <= 0 then
|
||
options.era = 'BCE'
|
||
end
|
||
date.year = y
|
||
m = tonumber(m)
|
||
d = tonumber(d)
|
||
H = tonumber(H)
|
||
M = tonumber(M)
|
||
S = tonumber(S)
|
||
if m == 0 then
|
||
newdate.partial = true
|
||
return date, options
|
||
end
|
||
date.month = m
|
||
if d == 0 then
|
||
newdate.partial = true
|
||
return date, options
|
||
end
|
||
date.day = d
|
||
if H > 0 or M > 0 or S > 0 then
|
||
date.hour = H
|
||
date.minute = M
|
||
date.second = S
|
||
end
|
||
return date, options
|
||
end
|
||
return
|
||
end
|
||
local function extract_ymd(item)
|
||
-- Called when no day or month has been set.
|
||
local y, m, d = item:match('^(%d%d%d%d)%-(%w+)%-(%d%d?)$')
|
||
if y then
|
||
if date.year then
|
||
return
|
||
end
|
||
if m:match('^%d%d?$') then
|
||
m = tonumber(m)
|
||
else
|
||
m = month_number(m)
|
||
end
|
||
if m then
|
||
date.year = tonumber(y)
|
||
date.month = m
|
||
date.day = tonumber(d)
|
||
return true
|
||
end
|
||
end
|
||
end
|
||
local function extract_day_or_year(item)
|
||
-- Called when a day would be valid, or
|
||
-- when a year would be valid if no year has been set and partial is set.
|
||
local number, suffix = item:match('^(%d%d?%d?%d?)(.*)$')
|
||
if number then
|
||
local n = tonumber(number)
|
||
if #number <= 2 and n <= 31 then
|
||
suffix = suffix:lower()
|
||
if suffix == '' or suffix == 'st' or suffix == 'nd' or suffix == 'rd' or suffix == 'th' then
|
||
date.day = n
|
||
return true
|
||
end
|
||
elseif suffix == '' and newdate.partial and not date.year then
|
||
date.year = n
|
||
return true
|
||
end
|
||
end
|
||
end
|
||
local function extract_month(item)
|
||
-- A month must be given as a name or abbreviation; a number could be ambiguous.
|
||
local m = month_number(item)
|
||
if m then
|
||
date.month = m
|
||
return true
|
||
end
|
||
end
|
||
local function extract_time(item)
|
||
local h, m, s = item:match('^(%d%d?):(%d%d)(:?%d*)$')
|
||
if date.hour or not h then
|
||
return
|
||
end
|
||
if s ~= '' then
|
||
s = s:match('^:(%d%d)$')
|
||
if not s then
|
||
return
|
||
end
|
||
end
|
||
date.hour = tonumber(h)
|
||
date.minute = tonumber(m)
|
||
date.second = tonumber(s) -- nil if empty string
|
||
return true
|
||
end
|
||
local item_count = 0
|
||
local index_time
|
||
local function set_ampm(item)
|
||
local H = date.hour
|
||
if H and not options.am and index_time + 1 == item_count then
|
||
options.am = ampm_options[item] -- caller checked this is not nil
|
||
if item:match('^[Aa]') then
|
||
if not (1 <= H and H <= 12) then
|
||
return
|
||
end
|
||
if H == 12 then
|
||
date.hour = 0
|
||
end
|
||
else
|
||
if not (1 <= H and H <= 23) then
|
||
return
|
||
end
|
||
if H <= 11 then
|
||
date.hour = H + 12
|
||
end
|
||
end
|
||
return true
|
||
end
|
||
end
|
||
for item in text:gsub(',', ' '):gsub(' ', ' '):gmatch('%S+') do
|
||
item_count = item_count + 1
|
||
if era_text[item] then
|
||
-- Era is accepted in peculiar places.
|
||
if options.era then
|
||
return
|
||
end
|
||
options.era = item
|
||
elseif ampm_options[item] then
|
||
if not set_ampm(item) then
|
||
return
|
||
end
|
||
elseif item:find(':', 1, true) then
|
||
if not extract_time(item) then
|
||
return
|
||
end
|
||
index_time = item_count
|
||
elseif date.day and date.month then
|
||
if date.year then
|
||
return -- should be nothing more so item is invalid
|
||
end
|
||
if not item:match('^(%d%d?%d?%d?)$') then
|
||
return
|
||
end
|
||
date.year = tonumber(item)
|
||
elseif date.day then
|
||
if not extract_month(item) then
|
||
return
|
||
end
|
||
elseif date.month then
|
||
if not extract_day_or_year(item) then
|
||
return
|
||
end
|
||
elseif extract_month(item) then
|
||
options.format = 'mdy'
|
||
elseif extract_ymd(item) then
|
||
options.format = 'ymd'
|
||
elseif extract_day_or_year(item) then
|
||
if date.day then
|
||
options.format = 'dmy'
|
||
end
|
||
else
|
||
return
|
||
end
|
||
end
|
||
if not date.year or date.year == 0 then
|
||
return
|
||
end
|
||
local era = era_text[options.era]
|
||
if era and era.isbc then
|
||
date.year = 1 - date.year
|
||
end
|
||
return date, options
|
||
end
|
||
|
||
local function autofill(date1, date2)
|
||
-- Fill any missing month or day in each date using the
|
||
-- corresponding component from the other date, if present,
|
||
-- or with 1 if both dates are missing the month or day.
|
||
-- This gives a good result for calculating the difference
|
||
-- between two partial dates when no range is wanted.
|
||
-- Return filled date1, date2 (two full dates).
|
||
local function filled(a, b)
|
||
-- Return date a filled, if necessary, with month and/or day from date b.
|
||
-- The filled day is truncated to fit the number of days in the month.
|
||
local fillmonth, fillday
|
||
if not a.month then
|
||
fillmonth = b.month or 1
|
||
end
|
||
if not a.day then
|
||
fillday = b.day or 1
|
||
end
|
||
if fillmonth or fillday then -- need to create a new date
|
||
a = Date(a, {
|
||
month = fillmonth,
|
||
day = math.min(fillday or a.day, days_in_month(a.year, fillmonth or a.month, a.calendar))
|
||
})
|
||
end
|
||
return a
|
||
end
|
||
return filled(date1, date2), filled(date2, date1)
|
||
end
|
||
|
||
local function date_add_sub(lhs, rhs, is_sub)
|
||
-- Return a new date from calculating (lhs + rhs) or (lhs - rhs),
|
||
-- or return nothing if invalid.
|
||
-- The result is nil if the calculated date exceeds allowable limits.
|
||
-- Caller ensures that lhs is a date; its properties are copied for the new date.
|
||
if lhs.partial then
|
||
-- Adding to a partial is not supported.
|
||
-- Can subtract a date or partial from a partial, but this is not called for that.
|
||
return
|
||
end
|
||
local function is_prefix(text, word, minlen)
|
||
local n = #text
|
||
return (minlen or 1) <= n and n <= #word and text == word:sub(1, n)
|
||
end
|
||
local function do_days(n)
|
||
local forcetime, jd
|
||
if floor(n) == n then
|
||
jd = lhs.jd
|
||
else
|
||
forcetime = not lhs.hastime
|
||
jd = lhs.jdz
|
||
end
|
||
jd = jd + (is_sub and -n or n)
|
||
if forcetime then
|
||
jd = tostring(jd)
|
||
if not jd:find('.', 1, true) then
|
||
jd = jd .. '.0'
|
||
end
|
||
end
|
||
return Date(lhs, 'juliandate', jd)
|
||
end
|
||
if type(rhs) == 'number' then
|
||
-- Add/subtract days, including fractional days.
|
||
return do_days(rhs)
|
||
end
|
||
if type(rhs) == 'string' then
|
||
-- rhs is a single component like '26m' or '26 months' (with optional sign).
|
||
-- Fractions like '3.25d' are accepted for the units which are handled as days.
|
||
local sign, numstr, id = rhs:match('^%s*([+-]?)([%d%.]+)%s*(%a+)$')
|
||
if sign then
|
||
if sign == '-' then
|
||
is_sub = not (is_sub and true or false)
|
||
end
|
||
local y, m, days
|
||
local num = tonumber(numstr)
|
||
if not num then
|
||
return
|
||
end
|
||
id = id:lower()
|
||
if is_prefix(id, 'years') then
|
||
y = num
|
||
m = 0
|
||
elseif is_prefix(id, 'months') then
|
||
y = floor(num / 12)
|
||
m = num % 12
|
||
elseif is_prefix(id, 'weeks') then
|
||
days = num * 7
|
||
elseif is_prefix(id, 'days') then
|
||
days = num
|
||
elseif is_prefix(id, 'hours') then
|
||
days = num / 24
|
||
elseif is_prefix(id, 'minutes', 3) then
|
||
days = num / (24 * 60)
|
||
elseif is_prefix(id, 'seconds') then
|
||
days = num / (24 * 3600)
|
||
else
|
||
return
|
||
end
|
||
if days then
|
||
return do_days(days)
|
||
end
|
||
if numstr:find('.', 1, true) then
|
||
return
|
||
end
|
||
if is_sub then
|
||
y = -y
|
||
m = -m
|
||
end
|
||
assert(-11 <= m and m <= 11)
|
||
y = lhs.year + y
|
||
m = lhs.month + m
|
||
if m > 12 then
|
||
y = y + 1
|
||
m = m - 12
|
||
elseif m < 1 then
|
||
y = y - 1
|
||
m = m + 12
|
||
end
|
||
local d = math.min(lhs.day, days_in_month(y, m, lhs.calendar))
|
||
return Date(lhs, y, m, d)
|
||
end
|
||
end
|
||
if is_diff(rhs) then
|
||
local days = rhs.age_days
|
||
if (is_sub or false) ~= (rhs.isnegative or false) then
|
||
days = -days
|
||
end
|
||
return lhs + days
|
||
end
|
||
end
|
||
|
||
local full_date_only = {
|
||
dayabbr = true,
|
||
dayname = true,
|
||
dow = true,
|
||
dayofweek = true,
|
||
dowiso = true,
|
||
dayofweekiso = true,
|
||
dayofyear = true,
|
||
gsd = true,
|
||
juliandate = true,
|
||
jd = true,
|
||
jdz = true,
|
||
jdnoon = true,
|
||
}
|
||
|
||
-- Metatable for a date's calculated fields.
|
||
local datemt = {
|
||
__index = function (self, key)
|
||
if rawget(self, 'partial') then
|
||
if full_date_only[key] then return end
|
||
if key == 'monthabbr' or key == 'monthdays' or key == 'monthname' then
|
||
if not self.month then return end
|
||
end
|
||
end
|
||
local value
|
||
if key == 'dayabbr' then
|
||
value = day_info[self.dow][1]
|
||
elseif key == 'dayname' then
|
||
value = day_info[self.dow][2]
|
||
elseif key == 'dow' then
|
||
value = (self.jdnoon + 1) % 7 -- day-of-week 0=Sun to 6=Sat
|
||
elseif key == 'dayofweek' then
|
||
value = self.dow
|
||
elseif key == 'dowiso' then
|
||
value = (self.jdnoon % 7) + 1 -- ISO day-of-week 1=Mon to 7=Sun
|
||
elseif key == 'dayofweekiso' then
|
||
value = self.dowiso
|
||
elseif key == 'dayofyear' then
|
||
local first = Date(self.year, 1, 1, self.calendar).jdnoon
|
||
value = self.jdnoon - first + 1 -- day-of-year 1 to 366
|
||
elseif key == 'era' then
|
||
-- Era text (never a negative sign) from year and options.
|
||
value = get_era_for_year(self.options.era, self.year)
|
||
elseif key == 'format' then
|
||
value = self.options.format or 'dmy'
|
||
elseif key == 'gsd' then
|
||
-- GSD = 1 from 00:00:00 to 23:59:59 on 1 January 1 AD Gregorian calendar,
|
||
-- which is from jd 1721425.5 to 1721426.49999.
|
||
value = floor(self.jd - 1721424.5)
|
||
elseif key == 'juliandate' or key == 'jd' or key == 'jdz' then
|
||
local jd, jdz = julian_date(self)
|
||
rawset(self, 'juliandate', jd)
|
||
rawset(self, 'jd', jd)
|
||
rawset(self, 'jdz', jdz)
|
||
return key == 'jdz' and jdz or jd
|
||
elseif key == 'jdnoon' then
|
||
-- Julian date at noon (an integer) on the calendar day when jd occurs.
|
||
value = floor(self.jd + 0.5)
|
||
elseif key == 'isleapyear' then
|
||
value = is_leap_year(self.year, self.calendar)
|
||
elseif key == 'monthabbr' then
|
||
value = month_info[self.month][1]
|
||
elseif key == 'monthdays' then
|
||
value = days_in_month(self.year, self.month, self.calendar)
|
||
elseif key == 'monthname' then
|
||
value = month_info[self.month][2]
|
||
end
|
||
if value ~= nil then
|
||
rawset(self, key, value)
|
||
return value
|
||
end
|
||
end,
|
||
}
|
||
|
||
-- Date operators.
|
||
local function mt_date_add(lhs, rhs)
|
||
if not is_date(lhs) then
|
||
lhs, rhs = rhs, lhs -- put date on left (it must be a date for this to have been called)
|
||
end
|
||
return date_add_sub(lhs, rhs)
|
||
end
|
||
|
||
local function mt_date_sub(lhs, rhs)
|
||
if is_date(lhs) then
|
||
if is_date(rhs) then
|
||
return DateDiff(lhs, rhs)
|
||
end
|
||
return date_add_sub(lhs, rhs, true)
|
||
end
|
||
end
|
||
|
||
local function mt_date_concat(lhs, rhs)
|
||
return tostring(lhs) .. tostring(rhs)
|
||
end
|
||
|
||
local function mt_date_tostring(self)
|
||
return self:text()
|
||
end
|
||
|
||
local function mt_date_eq(lhs, rhs)
|
||
-- Return true if dates identify same date/time where, for example,
|
||
-- Date(-4712, 1, 1, 'Julian') == Date(-4713, 11, 24, 'Gregorian') is true.
|
||
-- This is called only if lhs and rhs have the same type and the same metamethod.
|
||
if lhs.partial or rhs.partial then
|
||
-- One date is partial; the other is a partial or a full date.
|
||
-- The months may both be nil, but must be the same.
|
||
return lhs.year == rhs.year and lhs.month == rhs.month and lhs.calendar == rhs.calendar
|
||
end
|
||
return lhs.jdz == rhs.jdz
|
||
end
|
||
|
||
local function mt_date_lt(lhs, rhs)
|
||
-- Return true if lhs < rhs, for example,
|
||
-- Date('1 Jan 2016') < Date('06:00 1 Jan 2016') is true.
|
||
-- This is called only if lhs and rhs have the same type and the same metamethod.
|
||
if lhs.partial or rhs.partial then
|
||
-- One date is partial; the other is a partial or a full date.
|
||
if lhs.calendar ~= rhs.calendar then
|
||
return lhs.calendar == 'Julian'
|
||
end
|
||
if lhs.partial then
|
||
lhs = lhs.partial.first
|
||
end
|
||
if rhs.partial then
|
||
rhs = rhs.partial.first
|
||
end
|
||
end
|
||
return lhs.jdz < rhs.jdz
|
||
end
|
||
|
||
--[[ Examples of syntax to construct a date:
|
||
Date(y, m, d, 'julian') default calendar is 'gregorian'
|
||
Date(y, m, d, H, M, S, 'julian')
|
||
Date('juliandate', jd, 'julian') if jd contains "." text output includes H:M:S
|
||
Date('currentdate')
|
||
Date('currentdatetime')
|
||
Date('1 April 1995', 'julian') parse date from text
|
||
Date('1 April 1995 AD', 'julian') using an era sets a flag to do the same for output
|
||
Date('04:30:59 1 April 1995', 'julian')
|
||
Date(date) copy of an existing date
|
||
Date(date, t) same, updated with y,m,d,H,M,S fields from table t
|
||
Date(t) date with y,m,d,H,M,S fields from table t
|
||
]]
|
||
function Date(...) -- for forward declaration above
|
||
-- Return a table holding a date assuming a uniform calendar always applies
|
||
-- (proleptic Gregorian calendar or proleptic Julian calendar), or
|
||
-- return nothing if date is invalid.
|
||
-- A partial date has a valid year, however its month may be nil, and
|
||
-- its day and time fields are nil.
|
||
-- Field partial is set to false (if a full date) or a table (if a partial date).
|
||
local calendars = { julian = 'Julian', gregorian = 'Gregorian' }
|
||
local newdate = {
|
||
_id = uniq,
|
||
calendar = 'Gregorian', -- default is Gregorian calendar
|
||
hastime = false, -- true if input sets a time
|
||
hour = 0, -- always set hour/minute/second so don't have to handle nil
|
||
minute = 0,
|
||
second = 0,
|
||
options = {},
|
||
list = _date_list,
|
||
subtract = function (self, rhs, options)
|
||
return DateDiff(self, rhs, options)
|
||
end,
|
||
text = _date_text,
|
||
}
|
||
local argtype, datetext, is_copy, jd_number, tnums
|
||
local numindex = 0
|
||
local numfields = { 'year', 'month', 'day', 'hour', 'minute', 'second' }
|
||
local numbers = {}
|
||
for _, v in ipairs({...}) do
|
||
v = strip_to_nil(v)
|
||
local vlower = type(v) == 'string' and v:lower() or nil
|
||
if v == nil then
|
||
-- Ignore empty arguments after stripping so modules can directly pass template parameters.
|
||
elseif calendars[vlower] then
|
||
newdate.calendar = calendars[vlower]
|
||
elseif vlower == 'partial' then
|
||
newdate.partial = true
|
||
elseif vlower == 'fix' then
|
||
newdate.want_fix = true
|
||
elseif is_date(v) then
|
||
-- Copy existing date (items can be overridden by other arguments).
|
||
if is_copy or tnums then
|
||
return
|
||
end
|
||
is_copy = true
|
||
newdate.calendar = v.calendar
|
||
newdate.partial = v.partial
|
||
newdate.hastime = v.hastime
|
||
newdate.options = v.options
|
||
newdate.year = v.year
|
||
newdate.month = v.month
|
||
newdate.day = v.day
|
||
newdate.hour = v.hour
|
||
newdate.minute = v.minute
|
||
newdate.second = v.second
|
||
elseif type(v) == 'table' then
|
||
if tnums then
|
||
return
|
||
end
|
||
tnums = {}
|
||
local tfields = { year=1, month=1, day=1, hour=2, minute=2, second=2 }
|
||
for tk, tv in pairs(v) do
|
||
if tfields[tk] then
|
||
tnums[tk] = tonumber(tv)
|
||
end
|
||
if tfields[tk] == 2 then
|
||
newdate.hastime = true
|
||
end
|
||
end
|
||
else
|
||
local num = tonumber(v)
|
||
if not num and argtype == 'setdate' and numindex == 1 then
|
||
num = month_number(v)
|
||
end
|
||
if num then
|
||
if not argtype then
|
||
argtype = 'setdate'
|
||
end
|
||
if argtype == 'setdate' and numindex < 6 then
|
||
numindex = numindex + 1
|
||
numbers[numfields[numindex]] = num
|
||
elseif argtype == 'juliandate' and not jd_number then
|
||
jd_number = num
|
||
if type(v) == 'string' then
|
||
if v:find('.', 1, true) then
|
||
newdate.hastime = true
|
||
end
|
||
elseif num ~= floor(num) then
|
||
-- The given value was a number. The time will be used
|
||
-- if the fractional part is nonzero.
|
||
newdate.hastime = true
|
||
end
|
||
else
|
||
return
|
||
end
|
||
elseif argtype then
|
||
return
|
||
elseif type(v) == 'string' then
|
||
if v == 'currentdate' or v == 'currentdatetime' or v == 'juliandate' then
|
||
argtype = v
|
||
else
|
||
argtype = 'datetext'
|
||
datetext = v
|
||
end
|
||
else
|
||
return
|
||
end
|
||
end
|
||
end
|
||
if argtype == 'datetext' then
|
||
if tnums or not set_date_from_numbers(newdate, extract_date(newdate, datetext)) then
|
||
return
|
||
end
|
||
elseif argtype == 'juliandate' then
|
||
newdate.partial = nil
|
||
newdate.jd = jd_number
|
||
if not set_date_from_jd(newdate) then
|
||
return
|
||
end
|
||
elseif argtype == 'currentdate' or argtype == 'currentdatetime' then
|
||
newdate.partial = nil
|
||
newdate.year = current.year
|
||
newdate.month = current.month
|
||
newdate.day = current.day
|
||
if argtype == 'currentdatetime' then
|
||
newdate.hour = current.hour
|
||
newdate.minute = current.minute
|
||
newdate.second = current.second
|
||
newdate.hastime = true
|
||
end
|
||
newdate.calendar = 'Gregorian' -- ignore any given calendar name
|
||
elseif argtype == 'setdate' then
|
||
if tnums or not set_date_from_numbers(newdate, numbers) then
|
||
return
|
||
end
|
||
elseif not (is_copy or tnums) then
|
||
return
|
||
end
|
||
if tnums then
|
||
newdate.jd = nil -- force recalculation in case jd was set before changes from tnums
|
||
if not set_date_from_numbers(newdate, tnums) then
|
||
return
|
||
end
|
||
end
|
||
if newdate.partial then
|
||
local year = newdate.year
|
||
local month = newdate.month
|
||
local first = Date(year, month or 1, 1, newdate.calendar)
|
||
month = month or 12
|
||
local last = Date(year, month, days_in_month(year, month), newdate.calendar)
|
||
newdate.partial = { first = first, last = last }
|
||
else
|
||
newdate.partial = false -- avoid index lookup
|
||
end
|
||
setmetatable(newdate, datemt)
|
||
local readonly = {}
|
||
local mt = {
|
||
__index = newdate,
|
||
__newindex = function(t, k, v) error('date.' .. tostring(k) .. ' is read-only', 2) end,
|
||
__add = mt_date_add,
|
||
__sub = mt_date_sub,
|
||
__concat = mt_date_concat,
|
||
__tostring = mt_date_tostring,
|
||
__eq = mt_date_eq,
|
||
__lt = mt_date_lt,
|
||
}
|
||
return setmetatable(readonly, mt)
|
||
end
|
||
|
||
local function _diff_age(diff, code, options)
|
||
-- Return a tuple of integer values from diff as specified by code, except that
|
||
-- each integer may be a list of two integers for a diff with a partial date, or
|
||
-- return nil if the code is not supported.
|
||
-- If want round, the least significant unit is rounded to nearest whole unit.
|
||
-- For a duration, an extra day is added.
|
||
local wantround, wantduration, wantrange
|
||
if type(options) == 'table' then
|
||
wantround = options.round
|
||
wantduration = options.duration
|
||
wantrange = options.range
|
||
else
|
||
wantround = options
|
||
end
|
||
if not is_diff(diff) then
|
||
local f = wantduration and 'duration' or 'age'
|
||
error(f .. ': need a date difference (use "diff:' .. f .. '()" with a colon)', 2)
|
||
end
|
||
if diff.partial then
|
||
-- Ignore wantround, wantduration.
|
||
local function choose(v)
|
||
if type(v) == 'table' then
|
||
if not wantrange or v[1] == v[2] then
|
||
-- Example: Date('partial', 2005) - Date('partial', 2001) gives
|
||
-- diff.years = { 3, 4 } to show the range of possible results.
|
||
-- If do not want a range, choose the second value as more expected.
|
||
return v[2]
|
||
end
|
||
end
|
||
return v
|
||
end
|
||
if code == 'ym' or code == 'ymd' then
|
||
if not wantrange and diff.iszero then
|
||
-- This avoids an unexpected result such as
|
||
-- Date('partial', 2001) - Date('partial', 2001)
|
||
-- giving diff = { years = 0, months = { 0, 11 } }
|
||
-- which would be reported as 0 years and 11 months.
|
||
return 0, 0
|
||
end
|
||
return choose(diff.partial.years), choose(diff.partial.months)
|
||
end
|
||
if code == 'y' then
|
||
return choose(diff.partial.years)
|
||
end
|
||
if code == 'm' or code == 'w' or code == 'd' then
|
||
return choose({ diff.partial.mindiff:age(code), diff.partial.maxdiff:age(code) })
|
||
end
|
||
return nil
|
||
end
|
||
local extra_days = wantduration and 1 or 0
|
||
if code == 'wd' or code == 'w' or code == 'd' then
|
||
local offset = wantround and 0.5 or 0
|
||
local days = diff.age_days + extra_days
|
||
if code == 'wd' or code == 'd' then
|
||
days = floor(days + offset)
|
||
if code == 'd' then
|
||
return days
|
||
end
|
||
return floor(days/7), days % 7
|
||
end
|
||
return floor(days/7 + offset)
|
||
end
|
||
local H, M, S = diff.hours, diff.minutes, diff.seconds
|
||
if code == 'dh' or code == 'dhm' or code == 'dhms' or code == 'h' or code == 'hm' or code == 'hms' or code == 'M' or code == 's' then
|
||
local days = floor(diff.age_days + extra_days)
|
||
local inc_hour
|
||
if wantround then
|
||
if code == 'dh' or code == 'h' then
|
||
if M >= 30 then
|
||
inc_hour = true
|
||
end
|
||
elseif code == 'dhm' or code == 'hm' then
|
||
if S >= 30 then
|
||
M = M + 1
|
||
if M >= 60 then
|
||
M = 0
|
||
inc_hour = true
|
||
end
|
||
end
|
||
elseif code == 'M' then
|
||
if S >= 30 then
|
||
M = M + 1
|
||
end
|
||
else
|
||
-- Nothing needed because S is an integer.
|
||
end
|
||
if inc_hour then
|
||
H = H + 1
|
||
if H >= 24 then
|
||
H = 0
|
||
days = days + 1
|
||
end
|
||
end
|
||
end
|
||
if code == 'dh' or code == 'dhm' or code == 'dhms' then
|
||
if code == 'dh' then
|
||
return days, H
|
||
elseif code == 'dhm' then
|
||
return days, H, M
|
||
else
|
||
return days, H, M, S
|
||
end
|
||
end
|
||
local hours = days * 24 + H
|
||
if code == 'h' then
|
||
return hours
|
||
elseif code == 'hm' then
|
||
return hours, M
|
||
elseif code == 'M' or code == 's' then
|
||
M = hours * 60 + M
|
||
if code == 'M' then
|
||
return M
|
||
end
|
||
return M * 60 + S
|
||
end
|
||
return hours, M, S
|
||
end
|
||
if wantround then
|
||
local inc_hour
|
||
if code == 'ymdh' or code == 'ymwdh' then
|
||
if M >= 30 then
|
||
inc_hour = true
|
||
end
|
||
elseif code == 'ymdhm' or code == 'ymwdhm' then
|
||
if S >= 30 then
|
||
M = M + 1
|
||
if M >= 60 then
|
||
M = 0
|
||
inc_hour = true
|
||
end
|
||
end
|
||
elseif code == 'ymd' or code == 'ymwd' or code == 'yd' or code == 'md' then
|
||
if H >= 12 then
|
||
extra_days = extra_days + 1
|
||
end
|
||
end
|
||
if inc_hour then
|
||
H = H + 1
|
||
if H >= 24 then
|
||
H = 0
|
||
extra_days = extra_days + 1
|
||
end
|
||
end
|
||
end
|
||
local y, m, d = diff.years, diff.months, diff.days
|
||
if extra_days > 0 then
|
||
d = d + extra_days
|
||
if d > 28 or code == 'yd' then
|
||
-- Recalculate in case have passed a month.
|
||
diff = diff.date1 + extra_days - diff.date2
|
||
y, m, d = diff.years, diff.months, diff.days
|
||
end
|
||
end
|
||
if code == 'ymd' then
|
||
return y, m, d
|
||
elseif code == 'yd' then
|
||
if y > 0 then
|
||
-- It is known that diff.date1 > diff.date2.
|
||
diff = diff.date1 - (diff.date2 + (y .. 'y'))
|
||
end
|
||
return y, floor(diff.age_days)
|
||
elseif code == 'md' then
|
||
return y * 12 + m, d
|
||
elseif code == 'ym' or code == 'm' then
|
||
if wantround then
|
||
if d >= 16 then
|
||
m = m + 1
|
||
if m >= 12 then
|
||
m = 0
|
||
y = y + 1
|
||
end
|
||
end
|
||
end
|
||
if code == 'ym' then
|
||
return y, m
|
||
end
|
||
return y * 12 + m
|
||
elseif code == 'ymw' then
|
||
local weeks = floor(d/7)
|
||
if wantround then
|
||
local days = d % 7
|
||
if days > 3 or (days == 3 and H >= 12) then
|
||
weeks = weeks + 1
|
||
end
|
||
end
|
||
return y, m, weeks
|
||
elseif code == 'ymwd' then
|
||
return y, m, floor(d/7), d % 7
|
||
elseif code == 'ymdh' then
|
||
return y, m, d, H
|
||
elseif code == 'ymwdh' then
|
||
return y, m, floor(d/7), d % 7, H
|
||
elseif code == 'ymdhm' then
|
||
return y, m, d, H, M
|
||
elseif code == 'ymwdhm' then
|
||
return y, m, floor(d/7), d % 7, H, M
|
||
end
|
||
if code == 'y' then
|
||
if wantround and m >= 6 then
|
||
y = y + 1
|
||
end
|
||
return y
|
||
end
|
||
return nil
|
||
end
|
||
|
||
local function _diff_duration(diff, code, options)
|
||
if type(options) ~= 'table' then
|
||
options = { round = options }
|
||
end
|
||
options.duration = true
|
||
return _diff_age(diff, code, options)
|
||
end
|
||
|
||
-- Metatable for some operations on date differences.
|
||
diffmt = { -- for forward declaration above
|
||
__concat = function (lhs, rhs)
|
||
return tostring(lhs) .. tostring(rhs)
|
||
end,
|
||
__tostring = function (self)
|
||
return tostring(self.age_days)
|
||
end,
|
||
__index = function (self, key)
|
||
local value
|
||
if key == 'age_days' then
|
||
if rawget(self, 'partial') then
|
||
local function jdz(date)
|
||
return (date.partial and date.partial.first or date).jdz
|
||
end
|
||
value = jdz(self.date1) - jdz(self.date2)
|
||
else
|
||
value = self.date1.jdz - self.date2.jdz
|
||
end
|
||
end
|
||
if value ~= nil then
|
||
rawset(self, key, value)
|
||
return value
|
||
end
|
||
end,
|
||
}
|
||
|
||
function DateDiff(date1, date2, options) -- for forward declaration above
|
||
-- Return a table with the difference between two dates (date1 - date2).
|
||
-- The difference is negative if date1 is older than date2.
|
||
-- Return nothing if invalid.
|
||
-- If d = date1 - date2 then
|
||
-- date1 = date2 + d
|
||
-- If date1 >= date2 and the dates have no H:M:S time specified then
|
||
-- date1 = date2 + (d.years..'y') + (d.months..'m') + d.days
|
||
-- where the larger time units are added first.
|
||
-- The result of Date(2015,1,x) + '1m' is Date(2015,2,28) for
|
||
-- x = 28, 29, 30, 31. That means, for example,
|
||
-- d = Date(2015,3,3) - Date(2015,1,31)
|
||
-- gives d.years, d.months, d.days = 0, 1, 3 (excluding date1).
|
||
if not (is_date(date1) and is_date(date2) and date1.calendar == date2.calendar) then
|
||
return
|
||
end
|
||
local wantfill
|
||
if type(options) == 'table' then
|
||
wantfill = options.fill
|
||
end
|
||
local isnegative = false
|
||
local iszero = false
|
||
if date1 < date2 then
|
||
isnegative = true
|
||
date1, date2 = date2, date1
|
||
elseif date1 == date2 then
|
||
iszero = true
|
||
end
|
||
-- It is known that date1 >= date2 (period is from date2 to date1).
|
||
if date1.partial or date2.partial then
|
||
-- Two partial dates might have timelines:
|
||
---------------------A=================B--- date1 is from A to B inclusive
|
||
--------C=======D-------------------------- date2 is from C to D inclusive
|
||
-- date1 > date2 iff A > C (date1.partial.first > date2.partial.first)
|
||
-- The periods can overlap ('April 2001' - '2001'):
|
||
-------------A===B------------------------- A=2001-04-01 B=2001-04-30
|
||
--------C=====================D------------ C=2001-01-01 D=2001-12-31
|
||
if wantfill then
|
||
date1, date2 = autofill(date1, date2)
|
||
else
|
||
local function zdiff(date1, date2)
|
||
local diff = date1 - date2
|
||
if diff.isnegative then
|
||
return date1 - date1 -- a valid diff in case we call its methods
|
||
end
|
||
return diff
|
||
end
|
||
local function getdate(date, which)
|
||
return date.partial and date.partial[which] or date
|
||
end
|
||
local maxdiff = zdiff(getdate(date1, 'last'), getdate(date2, 'first'))
|
||
local mindiff = zdiff(getdate(date1, 'first'), getdate(date2, 'last'))
|
||
local years, months
|
||
if maxdiff.years == mindiff.years then
|
||
years = maxdiff.years
|
||
if maxdiff.months == mindiff.months then
|
||
months = maxdiff.months
|
||
else
|
||
months = { mindiff.months, maxdiff.months }
|
||
end
|
||
else
|
||
years = { mindiff.years, maxdiff.years }
|
||
end
|
||
return setmetatable({
|
||
date1 = date1,
|
||
date2 = date2,
|
||
partial = {
|
||
years = years,
|
||
months = months,
|
||
maxdiff = maxdiff,
|
||
mindiff = mindiff,
|
||
},
|
||
isnegative = isnegative,
|
||
iszero = iszero,
|
||
age = _diff_age,
|
||
duration = _diff_duration,
|
||
}, diffmt)
|
||
end
|
||
end
|
||
local y1, m1 = date1.year, date1.month
|
||
local y2, m2 = date2.year, date2.month
|
||
local years = y1 - y2
|
||
local months = m1 - m2
|
||
local d1 = date1.day + hms(date1)
|
||
local d2 = date2.day + hms(date2)
|
||
local days, time
|
||
if d1 >= d2 then
|
||
days = d1 - d2
|
||
else
|
||
months = months - 1
|
||
-- Get days in previous month (before the "to" date) given December has 31 days.
|
||
local dpm = m1 > 1 and days_in_month(y1, m1 - 1, date1.calendar) or 31
|
||
if d2 >= dpm then
|
||
days = d1 - hms(date2)
|
||
else
|
||
days = dpm - d2 + d1
|
||
end
|
||
end
|
||
if months < 0 then
|
||
years = years - 1
|
||
months = months + 12
|
||
end
|
||
days, time = math.modf(days)
|
||
local H, M, S = h_m_s(time)
|
||
return setmetatable({
|
||
date1 = date1,
|
||
date2 = date2,
|
||
partial = false, -- avoid index lookup
|
||
years = years,
|
||
months = months,
|
||
days = days,
|
||
hours = H,
|
||
minutes = M,
|
||
seconds = S,
|
||
isnegative = isnegative,
|
||
iszero = iszero,
|
||
age = _diff_age,
|
||
duration = _diff_duration,
|
||
}, diffmt)
|
||
end
|
||
|
||
return {
|
||
_current = current,
|
||
_Date = Date,
|
||
_days_in_month = days_in_month,
|
||
}
|