SELECT WEEKDAY('2020-09-30');
SELECT WEEKDAY(CURDATE());
SELECT WEEKDAY(NOW());
SELECT WEEKDAY(CURDATE()- INTERVAL 1 DAY);
SELECT WEEKDAY(CURDATE()+ INTERVAL 1 DAY);
SELECT WEEKDAY(CURDATE()- INTERVAL 1 DAY) as yesterday,
WEEKDAY(CURDATE()) as today,
WEEKDAY(CURDATE()+ INTERVAL 1 DAY) as tomorrow;
SELECT WEEKDAY('2020-02-30');