Module:Infobox/dates

local getArgs = require('Module:Arguments').getArgs local p = {}

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