Change iphone time

I want to set the time of system in the iphone application,but i don't know how to d开发者_运维技巧o. Would you know? Please tell me,thank you!

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You can't, as there is no public API provided by Apple to do that. Even then, it's bad practice to try and change a user system setting like that.

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Alternative: Use an NSDate and then modify it accordingly.

NSDate* now = [NSDate date];
    int hour = [[now dateWithCalendarFormat:nil timeZone:nil] hourOfDay];
    int min = [[now dateWithCalendarFormat:nil timeZone:nil] minuteOfHour];
    int sec = [[now dateWithCalendarFormat:nil timeZone:nil] secondOfMinute];
    NSLog(@"%d  /  %d  /  %d", hour+offset1, min+offset2, sec+offset2);

But you truly can't change the system clock. But, maybe this will help with what you want to do.

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It is not possible, check out this forum link:

http://www.iphonedevsdk.com/forum/iphone-sdk-development/51285-can-we-change-device-time-using-application.html