iOS 当前时区

   NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
   [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
   
   NSTimeZone *localZone = [NSTimeZone localTimeZone];
   NSInteger seconds= [localZone secondsFromGMT];

  //当前时区
   NSInteger LocaleN=seconds/3600;
    //如果不设置 默认是0时区 ，
   [dateFormatter setTimeZone:[NSTimeZone timeZoneForSecondsFromGMT:LocaleN]];//解决8小时时间差问题

   NSDate *newDate = [dateFormatter dateFromString:@"2020-1-15 17:00:00"];