iOS NSDate may not respond to +dateWithString

There is no mention of dateWithString: in the iOS NSDate Class Reference. It is is the the Mac OS X NSDate Class Reference, but it's use is discouraged. If it does in fact work in iOS, it's private API, and should be avoided.

You should send dateFromString: to an NSDateFormatter object instead, if your dates are in fact in a string.

If you dates aren't in a string but instead you have them as separate components, check out the NSDateComponents class.

thedollarhunter said:

Thanks for pointing that out, I will use dateFromString instead.

Another rookie question though, if I use NSDateFormatter to parse my string will it still work on devices with different regional settings?

Code:

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd MMM yyyy HH:mm:ss ZZ"];

NSDate *dateToCheck = [dateFormatter dateFromString:@"24 Dec 2011 00:00:00 -0000"];

NSTimeInterval dateDiff = [dateToCheck timeIntervalSinceNow];

Click to expand...

The user's locale and calendar are taken into consideration, so you want to set the locale before you set the format.

See Parsing Date String. In particular take heed of the advice to use the en_US_POSIX locale, not the en_US locale.