gistfile1.m

+ (NSDateFormatter *)utcDateFormatter {

    if (nil == _utcDateFormatter) {
        _utcDateFormatter = [[NSDateFormatter alloc] init];
        [_utcDateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"] autorelease]];
        [_utcDateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
        [_utcDateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss zzz"];

        [_utcDateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
    }

    return _utcDateFormatter;
}