将秒数转换成NSDate,加上时区偏移

-(NSDate*)zoneChange:(NSString*)second{

NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:[second intValue]];

NSTimeZone *zone = [NSTimeZone systemTimeZone];

    NSInteger interval = [zone secondsFromGMTForDate:confromTimesp];

    NSDate *localeDate = [confromTimesp  dateByAddingTimeInterval: interval];

    return localeDate;

}