iphone - NSDate - Convert Date to GMT -

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I need the ability to change to a NSDate value GMT date.

How can I go about converting NSDate value to GMT format to a NSDate value, which is used by the iPhone The known date is independent of the locale setting? 

  NSDateFormatter * dateFormatter = [[NSDateFormatter alloc] init]; DateFormatter.dateFormat = @ "yyyy-MM-dd'THH: mm"; Nstmezone * GMT = [Nstimeon TimezoneWithAbet: @ "GMT"]; [DateTimeSetimezone: GMT]; NSString * timestamp = [datefirm string string: [date of NSDT]]; [DateFormatter release];

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