Take the 2-minute tour ×  I noticed that if I set my device time
manually, and turn off the automatic time sync on my iOS device,
[NSDate date] returns the date and time assuming the device time
is correct--which it may not be.  Since the docs mention that
NSDate has some sort of sync with NTP, I am wondering if there
is any built-in way to get the accurate date and time instead of
having to assume the device date and time is correct.
share|improve this question I find one valuable check is to
simply make sure that the phone's time value is greater than the
date you shipped your app (or some such), so that you eliminate
the case where the date has reset to Jan 1, 1970 or whatever. In
that case throw up a message "Set your clock, you idiot!" (Or
words to that effect.) –  Hot Licks Feb 19 '13 at 18:13
@HotLicks this will in no way ensure that the time is correct as
the OP is asking. –  twaldron Feb 19 '13 at 18:45 True, but it
catches, especially, a lot of iPad Touches with the clock set
totally wrong. –  Hot