date - Getting system time in iPhone

Question

I know that there is a method [NSDate date] which returns current date and time from iPhone clock. But if this clock time was changed manually it would rune my code. Is there any opportunity to get world time, not current time from iPhone?

Answer 1

Yes, you can have correct current time by using ntp/sntp.

Following uris might help you to write your own implementation:

Simple NTP client for iOS : http://code.google.com/p/ios-ntp/

NSDate from time server: http://pathoneycutt.com/2010/12/nsdate-from-time-server/