יחידה:תאריך: הבדלים בין גרסאות בדף

→ העריכה הקודמת העריכה הבאה ←

@@ שורה 1: / שורה 1: @@
 local Date = {}
+local maxDaysInMonth = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
 --Internal functions
@@ שורה 199: / שורה 200: @@
      return ((year % 4) == 0) and
              (not (((year % 100) == 0) and ((year % 400) ~= 0)))
+end
+local isDateInLeapYear = function(indate)
+	if indate.calendar == Date.CALENDAR.JULIAN then
+		return 0 == indate.year % 4
+	end
+	return leapGregorian(indate.year)
 end
@@ שורה 245: / שורה 253: @@
      return year, month, day
+end
+-- adapted from ro:Modul:GregorianDate
+local initialOffset = -3
+local limitDates = {
+	{year = 4, month = 3, day = 3, calendar = 'julian' },
+	{year = 100, month = 3, day = 2, calendar = 'julian' },
+	{year = 200, month = 3, day = 1, calendar = 'julian' },
+	{year = 300, month = 2, day = 29, calendar = 'julian' },
+	{year = 500, month = 2, day = 28, calendar = 'julian' },
+	{year = 600, month = 2, day = 27, calendar = 'julian' },
+	{year = 700, month = 2, day = 26, calendar = 'julian' },
+	{year = 900, month = 2, day = 25, calendar = 'julian' },
+	{year = 1000, month = 2, day = 24, calendar = 'julian' },
+	{year = 1100, month = 2, day = 23, calendar = 'julian' },
+	{year = 1300, month = 2, day = 22, calendar = 'julian' },
+	{year = 1400, month = 2, day = 21, calendar = 'julian' },
+	{year = 1500, month = 2, day = 20, calendar = 'julian' },
+	{year = 1700, month = 2, day = 19, calendar = 'julian' },
+	{year = 1800, month = 2, day = 18, calendar = 'julian' },
+	{year = 1900, month = 2, day = 17, calendar = 'julian' },
+	{year = 2100, month = 2, day = 16, calendar = 'julian' },
+	{year = 2200, month = 2, day = 15, calendar = 'julian' },
+	{year = 2300, month = 2, day = 14, calendar = 'julian' }
+}
+function Date.julianToGregorian(indate)
+	if indate.calendar ~= Date.CALENDAR.JULIAN then
+			return indate
+	end
+	local offset = initialOffset
+	local limitDateIdx = 1
+	while limitDateIdx < #limitDates and le(limitDates[limitDateIdx], indate) do
+		limitDateIdx = limitDateIdx + 1
+		offset = offset + 1
+	end
+	local outputDate = Date.addDaysToDate(indate, offset)
+	outputDate.calendar = Date.CALENDAR.GREGORIAN
+	outputDate.calendarmodel = 'http://www.wikidata.org/entity/Q1985727'
+	return Date.new(outputDate)
+end
+function Date.addDaysToDate(indate, days)
+	local outdate = mw.clone(indate)
+	outdate.day = outdate.day + days
+	local lastDayOfMonth = maxDaysInMonth[outdate.month]
+	while outdate.day > lastDayOfMonth do
+		lastDayOfMonth = maxDaysInMonth[outdate.month]
+		if outdate.month == 2 and isDateInLeapYear(outdate) then lastDayOfMonth = 29 end
+		outdate.month = outdate.month + 1
+		outdate.day = outdate.day - lastDayOfMonth
+	end
+	while outdate.month > 12 do
+		outdate.year = outdate.year + 1
+		outdate.month = outdate.month - 12
+	end
+	return outdate
 end