current_time( 'mysql' ) returns local site time: 2021-05-13 12:29:09
current_time( 'mysql', 1 ) returns GMT: 2021-05-13 16:29:09
current_time( 'timestamp' ) returns local site time: 2021-05-13 12:29:09current_time( 'timestamp', 1 ) returns GMT: 2021-05-13 16:29:09
