1.  

- (NSDate*)localeDate:(NSDate*)date {
    NSTimeZone *zone = [NSTimeZone systemTimeZone];
    NSInteger interval = [zone secondsFromGMTForDate: date];
    NSDate *localeDate = [date dateByAddingTimeInterval: interval];
    return localeDate;
｝

 

2.  

[dateFormat setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];