-- Examples showing how to use . See the talk page for output.local Date = require('Module:Date')._Date
local show -- function defined below to display results
-- A date can be constructed using various input formats.local function make_a_date show('Make a date') local same_dates = for _, date in ipairs(same_dates) do show(nil, date:text .. ' or ' .. date:text('mdy')) end local more_dates = for _, date in ipairs(more_dates) do show(nil, date.dayname .. ' ' .. date:text .. ' in the ' .. date.calendar .. ' calendar is Julian day ' .. date.jd) endend
-- A date can be displayed using various output formats.local function show_a_date show('Show a date') local dates = local format_option = for _, t in ipairs(format_option) do local format = t[1] local option = t[2] for _, date in ipairs(dates) do show(nil, date:text(format, option)) end endend
-- When an input date is parsed, its format is stored.local function keep_format show('Keep format of input date') local somedate = Date('March 9, 2016') local dates = show(nil, 'Format of somedate was ' .. somedate.format) for _, date in ipairs(dates) do show(nil, date:text .. ' or ' .. date:text(date.format)) endend
-- Using Date to get the current date, or current date and time.local function current_date local now_date = Date('currentdate') local now_datetime = Date('currentdatetime') show('Current date showing when this page was last purged', now_date:text, -- 7 March 2016 (for example) now_date:text('mdy'), -- March 7, 2016 now_date:text('ymd'), -- 2016-03-07 now_date:text('%A %-d %B %-Y'), -- Monday 7 March 2016 now_datetime:text, -- 21:32:45 7 March 2016 now_datetime:text('hms'), -- 21:32:45 now_datetime:text('%c') -- 9:32 pm 7 March 2016 )end
-- Using current to provide default values.local function current_as_default(year, month, day, hour, minute, second) local current = require('Module:Date')._current year = year or current.year month = month or current.month day = day or current.day hour = hour or current.hour minute = minute or current.minute second = second or current.second show('Using the current date as a default', year, month, day, hour, minute, second) -- Alternatively, a date can be constructed with specified items overridden. show(nil, Date('currentdatetime',):text('%c'))end
-- Make a date from the day number in a year.local function date_from_day_of_year -- Example: day 123 in 2015 and in 2016. show('Make a date from the day number in a year') local offset = 123 - 1 -- 1 January has day-of-year = 1 for _, year in ipairs do local date = Date(year, 1, 1) + offset show(nil, 'Day ' .. date.dayofyear .. ' in ' .. year .. ' is ' .. date:text) endend
-- Number of days in a month for Gregorian (default) and Julian calendars.local function days_in_month(year, month, calendar_name) local title = 'Days in month' if calendar_name then title = title .. ' (' .. calendar_name .. ' calendar)' end local monthdays = require('Module:Date')._days_in_month show(title, monthdays(year, month, calendar_name)) -- Alternative method, using Date. local date = Date(year, month, 1, calendar_name) show(nil, date.monthname .. ' ' .. date.year .. ' had ' .. date.monthdays .. ' days') show(nil, date:text('% % had % days')) -- sameend
-- Julian day number and date arithmetic.local function julian_date(year, month, count, calendar_name) if calendar_name then show('Julian date (' .. calendar_name .. ')') else show('Julian date (Gregorian)') -- Gregorian calendar by default local date = Date('24 November 4714 BCE') show(nil, 'Julian day number was ' .. date.jd .. ' on ' .. date:text('mdy')) end local first_of_month = Date(year, month, 1, calendar_name) for _ = 1, count do first_of_month = first_of_month + '1m' -- next month local date = first_of_month - '1d' -- last day of month show(nil, 'Last day in month (' .. date:text .. ' ' .. date.calendar .. ' calendar) had Julian day number ' .. date.jd ) endend
-- Number of days a date was in the past, or will be in the future.local function how_long(date_text) local now_date = Date('currentdate') local then_date = Date(date_text) if not then_date then show('How long', 'Invalid date: ' .. (date_text or )) return end local fmt = '%A %B %-d, %-Y % (day of year = %, serial day = %) ' local info = then_date:text(fmt) if then_date
1 and or 's' show('How long', info .. string.format(fmt, days, s)) local y, m, d = diff:age('ymd') -- age in years, months, days show(nil, string.format('(%d years + %d months + %d days)', y, m, d))end
-- First and third Fridays in each month of the given year.local function fridays(year) show('First and third Fridays in each month of ' .. year) for month = 1, 12 do local dates = Date(year, month, 1):list('Friday >=') show(nil, dates[1] .. ', ' .. dates[3]) endend
-- Next Friday after or before a particular date.local function next_friday show('Next Friday and last Friday for certain dates') local dates = for _, date in ipairs(dates) do -- 1 = number of Fridays that are wanted in the list local after = date:list('1 Friday')[1] local before = date:list('1 Friday <')[1] local format = '%A %-d %B %-Y' show(nil, 'For ' .. date:text(format) .. ', the next is ' .. after:text(format) .. ', and the last is ' .. before:text(format) ) endend
-- Results are held in the lines table.local linesfunction show(title, ...) -- for forward declaration above if title then if lines[1] then table.insert(lines, ) end table.insert(lines, "" .. title .. "") end for _, text in ipairs do table.insert(lines, ':' .. tostring(text)) endend
local function main lines = make_a_date show_a_date keep_format current_date current_as_default(nil, nil, nil, 14, 30, 0) -- 2:30 pm today date_from_day_of_year days_in_month(1900, 2) days_in_month(1900, 2, 'Julian') julian_date(1899, 11, 4) julian_date(-120, 11, 4, 'Julian') how_long('29 Feb 2100') -- an invalid date how_long('currentdate') how_long('29 Feb 2400') how_long('29 Feb 2401 BCE') fridays(2016) next_friday return table.concat(lines, '\n')end
return