TGRTweet.m

+ (NSDate *)dateFromTwitterDate:(NSString *)dateString
{
    static dispatch_once_t onceToken;
    static NSDateFormatter *dateFormatter;
    
    dispatch_once(&onceToken, ^{
        dateFormatter = [[NSDateFormatter alloc] init];
        [dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_US_POSIX"]];
        [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:0]];
        [dateFormatter setDateFormat:@"eee MMM dd HH:mm:ss ZZZZ yyyy"];
    });
    
    return [dateFormatter dateFromString:dateString];
}