The correct date format is:
[dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssxxx"];
or
[dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm:ssZZZZZ"];
See: ICU Formatting Dates and Times
NSString *datestring = @"2014-02-07T00:00:00+08:00";
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setDateFormat:@"yyyy-MM-dd'T'HH:mm:sszzz"];
NSDate *date = [dateFormat dateFromString:datestring];
NSDateFormatter *newDateFormatter = [[NSDateFormatter alloc]init];
[newDateFormatter setDateFormat:@"MM/dd/yyyy"];
NSString *newString = [newDateFormatter stringFromDate:date];
NSLog(@"Date: %@, formatted date: %@", date, newString);
NSLog output:
Date: 2014-02-06 16:00:00 +0000, formatted date: 02/06/2014