current_time( 'mysql' ) returns local site time: 2021-04-14 01:04:29
current_time( 'mysql', 1 ) returns GMT: 2021-04-13 23:04:29
current_time( 'timestamp' ) returns local site time: 2021-04-14 01:04:29current_time( 'timestamp', 1 ) returns GMT: 2021-04-13 23:04:29
