current_time( 'mysql' ) returns local site time: 2019-12-06 18:41:56
current_time( 'mysql', 1 ) returns GMT: 2019-12-06 23:41:56
current_time( 'timestamp' ) returns local site time: 2019-12-06 18:41:56current_time( 'timestamp', 1 ) returns GMT: 2019-12-06 23:41:56
