Swift语言中格式化日期跟其它编程语言很相似：

        

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var dformatter = NSDateFormatter()
 
dformatter.dateFormat = "yyyy年MM月dd日 HH:mm:ss"
 
var datestr = dformatter.stringFromDate(date)

 用Calendar操作日期 

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let gregorian = NSCalendar(calendarIdentifier: NSCalendarIdentifierGregorian)
 
let now = NSDate()
 
var dateformatter = NSDateFormatter()
dateformatter.dateFormat = "yyyy-MM-dd"
let birthday = dateformatter.dateFromString("1986-11-10")
 
let components = gregorian?.components(NSCalendarUnit.CalendarUnitYear, fromDate: birthday!, toDate: now, options: NSCalendarOptions(0))
 
components?.year