比较 Swift 中的两个日期

Question

So I have to save my cache with the timestamp(named timestamp1) The next time app loads, I have to compare the difference with the current timestamp and timestamp1.

How will I implement this?

Answer 1

You can directly access it through property timeIntervalSinceNow of Date . Also, there is no need to use NSDate in Swift 3. Use Date and date(from:) method of DateFormatter return instance of Date? not NSDate? .

let timeInterval = date.timeIntervalSinceNow

And you can get TimeInterval between two dates using method timeIntervalSince(_:) .

let timeInterval = date1.timeIntervalSince(date2)