current_time( 'mysql' ) returns local site time: 2020-08-11 02:07:30
current_time( 'mysql', 1 ) returns GMT: 2020-08-11 00:07:30
current_time( 'timestamp' ) returns local site time: 2020-08-11 02:07:30current_time( 'timestamp', 1 ) returns GMT: 2020-08-11 00:07:30
