ios - Creating NSDate from Int components -

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i have calendar select date:

func sacalendardate(calendar: sacalendar!, didselectdate day: int32, month: int32, year: int32) {     var date = date.from(year: int(year), month: int(month), day: int(day))      print("\(year) , \(month) , \(day)")      let formatter = nsdateformatter()     formatter.datestyle = nsdateformatterstyle.mediumstyle     formatter.timestyle = nsdateformatterstyle.nostyle     let datestring = formatter.stringfromdate(date)      buttonselectdates.settitle("\(datestring)", forstate: uicontrolstate.normal)     getusers(date) }

when feed "date" in method:

class func from(#year:int, month:int, day:int) -> nsdate {     var c = nsdatecomponents()     c.year = year     c.month = month     c.day = day      var gregorian = nscalendar(identifier:nscalendaridentifiergregorian)     var date = gregorian!.datefromcomponents(c)     return date! }

i date 1 day behind: selecteddate: 2015-07-14 22:00:00 +0000 , parameters are: 2015, 7 , 15. why happen?

nsdate single point in time represented seconds since 1.1.1970, not care timezones or - "timezone" gmt , +0000 (no offset). if create nsdate calendar local timezone, example +0200 timezone offset taken off actual date provide represent point in time without timezone. readable date representation of nsdate need use nsdateformatter knows current timezone:

let date = from(2015, month: 7, day: 15) let dateformatter = nsdateformatter() dateformatter.dateformat = "yyyy-mm-dd hh:mm:ss z"  print(dateformatter.stringfromdate(date)) print(date)

you receive following printed output:

2015-07-15 00:00:00 +0200
2015-07-14 22:00:00 +0000


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