Editing Module:YMD to ISO

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local p = {}
local function month_number(month_name)
local months_full = {january=1, february=2, march=3, april=4, may=5, june=6, july=7, august=8, september=9, october=10, november=11, december=12}
local months_abbr = {jan=1, feb=2, mar=3, apr=4, may=5, jun=6, jul=7, aug=8, sep=9, sept=9, oct=10, nov=11, dec=12}
local month_lc, _ = string.gsub(string.lower(month_name),'%.','',1)
local month_num = months_full[month_lc] or months_abbr[month_lc] or 0
return month_num
end
local function days_in_month(month_num,year)
-- modified from code in Module:Citation/CS1/Date_validation
local days = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}
local month_length
if month_num == 2 then -- February: 28 days, unless leap year
month_length = 28
if year <= 1582 then -- Julian calendar before Oct 1582
if (year%4) == 0 then
month_length = 29 -- if leap year, then 29 days
end
 
 
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* The module exports are available as the variable "p", including unsaved modifications. * Precede a line with "=" to evaluate it as an expression or use print(). Use mw.logObject() for tables. * Use mw.log() and mw.logObject() in module code to send messages to this console.

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