current_time( 'mysql' ) returns local site time: 2019-12-12 21:27:35
current_time( 'mysql', 1 ) returns GMT: 2019-12-13 02:27:35
current_time( 'timestamp' ) returns local site time: 2019-12-12 21:27:35current_time( 'timestamp', 1 ) returns GMT: 2019-12-13 02:27:35
