[ios] How do you create a Swift Date object?

Swift doesn't have its own Date type, but you to use the existing Cocoa NSDate type, e.g:

class Date {

    class func from(year: Int, month: Int, day: Int) -> Date {
        let gregorianCalendar = NSCalendar(calendarIdentifier: .gregorian)!

        var dateComponents = DateComponents()
        dateComponents.year = year
        dateComponents.month = month
        dateComponents.day = day

        let date = gregorianCalendar.date(from: dateComponents)!
        return date
    }

    class func parse(_ string: String, format: String = "yyyy-MM-dd") -> Date {
        let dateFormatter = DateFormatter()
        dateFormatter.timeZone = NSTimeZone.default
        dateFormatter.dateFormat = format

        let date = dateFormatter.date(from: string)!
        return date
    }
}

Which you can use like:

var date = Date.parse("2014-05-20")
var date = Date.from(year: 2014, month: 05, day: 20)

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