current_time( 'mysql' ) returns local site time: 2021-04-12 06:04:56
current_time( 'mysql', 1 ) returns GMT: 2021-04-12 04:04:56
current_time( 'timestamp' ) returns local site time: 2021-04-12 06:04:56current_time( 'timestamp', 1 ) returns GMT: 2021-04-12 04:04:56
