[objective-C]setDateFormat

NSDateFormatter *formatter =  [[NSDateFormatter alloc] init];[formatter setDateFormat:@"yyyy-MM-dd hh:mm:ss"];   //12hours[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];   //24hoursNSTimeZone* timeZone = [NSTimeZone timeZoneWithName:@"Asia/Shanghai"];[formatter setTimeZone:timeZone];NSString *loctime = [formatter stringFromDate:date];[formatter release];

若需要至毫秒：

[formatter setDateFormat:@"yyyy-MM-dd hh:mm:ss.SSS"];