current_time( 'mysql' ) returns local site time: 2021-07-28 03:53:08
current_time( 'mysql', 1 ) returns GMT: 2021-07-28 01:53:08
current_time( 'timestamp' ) returns local site time: 2021-07-28 03:53:08current_time( 'timestamp', 1 ) returns GMT: 2021-07-28 01:53:08
