current_time( 'mysql' ) returns local site time: 2020-01-25 11:48:22
current_time( 'mysql', 1 ) returns GMT: 2020-01-25 16:48:22
current_time( 'timestamp' ) returns local site time: 2020-01-25 11:48:22current_time( 'timestamp', 1 ) returns GMT: 2020-01-25 16:48:22
