iOS - How to get raw offset for timezone?

Question

How do I get the raw offset in milliseconds for Coordinated Universal Time in iOS programmatically?

Answer 1

NSInteger millisecondsFromGMT = 1000 * [[NSTimeZone localTimeZone] secondsFromGMT];

In Swift 3 and Swift 4:

let millisecondsFromGmt = 1000 * TimeZone.autoupdatingCurrent.secondsFromGMT()