current_time( 'mysql' ) returns local site time: 2021-07-27 21:54:30
current_time( 'mysql', 1 ) returns GMT: 2021-07-28 01:54:30
current_time( 'timestamp' ) returns local site time: 2021-07-27 21:54:30current_time( 'timestamp', 1 ) returns GMT: 2021-07-28 01:54:30
