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swift3nscalendar

Swift 3 Date Extension: Getting 'daysFrom' a date

In my old code I had a Date extension called "daysFrom" and I can't seem to migrate to Swift 3:

func daysFrom(_ date:Date) -> Int{
    //Swift 2: 
    //return Calendar.current.date(.firstWeekday, from: date, to: self, options: []).day

    //My Swift 3 attempt, doesn't work:
    return Calendar.current.date([.firstWeekday], from: date, to: self).day
}

I found this Swift thread which says:

...neither NSCalendarUnit in Swift 2 nor Calendar.Component in Swift 3 contain the components firstWeekday...

So how do I replace this extension??

Solution

  • To get days between two dates, use dateComponents:

    extension Date {
    func days(from date: Date) -> Int {
        return Calendar.current.dateComponents([.day], from: date, to: self).day!
    }
}

    And then

    let days = endDate.days(from: startDate)