Method is_valid_time

sql/sql_class.h:2299–2302

TODO: this will be obsolete when we have support for 64 bit my_time_t */

  }
  /*TODO: this will be obsolete when we have support for 64 bit my_time_t */
  inline bool	is_valid_time() 
  { 
    return (IS_TIME_T_VALID_FOR_TIMESTAMP(start_time.tv_sec));
  }
  void set_time_after_lock()
  {
    utime_after_lock= my_micro_time();