In iOS how to get current time like System.currentTimeMillis() in java?

If we are talking about taking the time with miliseconds, I'd use CACurrentMediaTime(). Consider that the miliseconds are the fractional part.

NSDate().timeIntervalSince1970 * 1000

You could use: NSDate().timeIntervalSince1970

"The interval between the date object and 00:00:00 UTC on 1 January 1970."