How to convert NSDate into Unix timestamp in Objective C/iPhone?

Question

How can I convert an NSDate to a Unix timestamp in Objective-C?

Answer 1

NSDate *date = [NSDate date];
NSTimeInterval ti = [date timeIntervalSince1970];

NSTimeInterval is typedefed as a float, defined in seconds. If you want it in integer form, just cast the result to a long and use that instead, but this gives more precision.

Answer 2

I believe - [NSDate timeIntervalSince1970] is what you want. Jan 1, 1970 is the date of the Unix epoch.