Module:Infobox/dates

local getArgs = require('Module:Arguments').getArgs

local default_error_category = "Category:Pages using infobox television with nonstandard dates"

local p = {}

function p.start_end_date_template_validation(frame)

local args = getArgs(frame)

local error_category = args.error_category or default_error_category

local start_date = args.first_aired or args.released or args.airdate or args.release_date or args.airdate_overall

if start_date then

if not start_date:find("dtstart") then

return error_category

end

end

local end_date = args.last_aired

if end_date then

if not end_date:find("dtend") and end_date ~= "present" then

return error_category

end

end

end

function p.dates(frame)

local returnval

local args = getArgs(frame)

if table.getn(args) < 2 then

if args['1'] == nil and args['2'] == nil then

return ''

elseif args['1'] == nil then

return args['2']

elseif args['2'] == nil then

return args['1']

end

end

args['1'] = args['1']:gsub(" "," ")

args['2'] = args['2']:gsub(" "," ")

local dmy = false

local pr1, m1, d1, y1, su1 = string.match(args['1'], '(.-)(%u%a+)%s(%d+),%s(%d+)(.*)')

local pr2, m2, d2, y2, su2 = string.match(args['2'], '(.-)(%u%a+)%s(%d+),%s(%d+)(.*)')

if y1 == nil then

dmy = true

pr1, d1, m1, y1, su1 = string.match(args['1'], '(.-)(%d%d?)%s(%a+)%s(%d+)(.*)')

pr2, d2, m2, y2, su2 = string.match(args['2'], '(.-)(%d%d?)%s(%a+)%s(%d+)(.*)')

end

local dash = ' –
'

if y1 ~= nil and y2 ~= nil then

su1 = su1 or ''

su2 = su2 or ''

local MONTHS = {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 diff = os.time({year=y2, month=MONTHS[m2], day=d2, hour=0, min=0, sec=0}) - os.time({year=y1, month=MONTHS[m1], day=d1, hour=0, min=0, sec=0})

if diff < 0 then

returnval = 'Invalid date range'

else

if y1 == y2 then

if dmy == false then

returnval = pr1 .. m1 .. ' ' .. d1 .. su1 .. dash .. pr2 .. m2 ..' '.. d2 ..', '.. y2 .. su2

else

returnval = pr1 .. d1 .. ' ' .. m1 .. su1 .. dash .. pr2 .. d2 .. ' ' .. m2 .. ' ' .. y2 .. su2

end

else

if dmy == false then

returnval = pr1 .. m1 .. ' ' .. d1 ..', '.. y1 .. su1 .. dash .. pr2 .. m2 .. ' '.. d2 .. ', ' .. y2 .. su2

else

returnval = pr1 .. d1 .. ' ' .. m1 ..' '.. y1 .. su1 .. dash .. pr2 .. d2 .. ' '.. m2 .. ' ' .. y2 .. su2

end

end

end

else

returnval = args['1']..dash..args['2'];

end

return returnval;

end

return p