Is there a daylight savings check in Swift?

Question

I need to check to see if the current date is during daylight savings time. In pseudocode that would be like this:

let date = NSDate()

if date.isDaylightSav         


        

Answer 1

An NSDate alone represents an absolute point in time. To decide if a date is during daylight savings time or not it needs to be interpreted in the context of a time zone.

Therefore you'll find that method in the NSTimeZone class and not in the NSDate class. Example:

let date = NSDate()

let tz = NSTimeZone.localTimeZone()
if tz.isDaylightSavingTimeForDate(date) {

}

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Update for Swift 3/4:

let date = Date()

let tz = TimeZone.current
if tz.isDaylightSavingTime(for: date) {
    print("Summertime, and the livin' is easy ...                                                                     

                                                        
            

Answer 2

Swift 4.0 or later

You can check a date isDaylightSavingTime in two ways by time zone identifier or abbreviation.

let timeZone = TimeZone(identifier: "America/New_York")!
if timeZone.isDaylightSavingTime(for: Date()) {
   print("Yes, daylight saving time at a given date")        
}

let timeZone = TimeZone(abbreviation: "EST")!
if timeZone.isDaylightSavingTime(for: Date()) {
   print("Yes, daylight saving time at a given date")     
}