Is it possible to set timestamp to nsuserdefaults and then check, if it changed, then do action?
if ([[NSUserDefaults standardUserDefaults] boolForKey:@"timestamp"])
{
}
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You cannot store the timestamp itself in the NSUserDefaults, but you can store an integer representing the TimeStamp, these you can easily compare.
Check this for an example;
Example of timestamp – int conversion, storing in NSUserDefaults