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objective-cnsdatenstimeinterval

Calculate time difference when different iPhone have different time settings

I'm making a Turn-Based game, and trying to figure out when the last turn happened. I get it to work by doing this:

NSDate *lastTurn = [NSDate date]; (When sending turn)

... And then calculate the difference for the next player when it's his/her turn: 

NSTimeInterval *diff = [lastTurn timeIntervalSinceNow];

This works great if both users have the same time settings. But if one player have their iphone set to a different timezone or have the time set all wrong, the result will be wrong.

How can i fix this?

Many thanks

Solution

  • Use GMT time instead of local time.

    Maybe something like this (I haven't tried):

    NSInteger sec = [[[NSCalendar currentCalendar] timeZone] secondsFromGMT];