ios - Swift days between two NSDates -

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i'm wondering if there new , awesome possibility amount of days between 2 nsdates in swift / "new" cocoa?

e.g. in ruby do:

(end_date - start_date).to_i

the accepted answer won't return correct day number between 2 dates. have consider time difference well. example if compare dates 2015-01-01 10:00 , 2015-01-02 09:00, days between dates return 0 (zero) since difference between dates less 24 hours (it's 23 hours).

if purpose exact day number between 2 dates, can work around issue this: 

// assuming firstdate , seconddate defined // ...  let calendar = nscalendar.currentcalendar()  // replace hour (time) of both dates 00:00 let date1 = calendar.startofdayfordate(firstdate) let date2 = calendar.startofdayfordate(seconddate)  let flags = nscalendarunit.day let components = calendar.components(flags, fromdate: date1, todate: date2, options: [])  components.day  // return number of day(s) between dates

swift 3 version

let calendar = nscalendar.current  // replace hour (time) of both dates 00:00 let date1 = calendar.startofday(for: firstdate) let date2 = calendar.startofday(for: seconddate)  let components = calendar.datecomponents([.day], from: date1, to: date2)

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