How do I get the raw offset in milliseconds for Coordinated Universal Time in iOS programmatically?
NSInteger millisecondsFromGMT = 1000 * [[NSTimeZone localTimeZone] secondsFromGMT];
In Swift 3 and Swift 4:
let millisecondsFromGmt = 1000 * TimeZone.autoupdatingCurrent.secondsFromGMT()
schmidt9
Please see answer to my question:
https://stackoverflow.com/a/31988549/3004003
It seems to be more precise regarding expression raw offset, because "raw" actually should mean "without DST at all", like it is in Java (getRawOffset() in java.util.TimeZone class)
来源：https://stackoverflow.com/questions/8188818/ios-how-to-get-raw-offset-for-timezone