Get the first/last day of the current week, month, quarter in MySQL

mysql 获取当年第一天的年月日格式：

SELECT DATE_SUB(CURDATE(),INTERVAL dayofyear(now())-1 DAY);

MySQLto get the current week、月、first day of the season/最后一天

The first day of the current week：

select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 1 DAY)

The last day of the current week：

select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) – 5 DAY)

The first day of the previous week：

select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 8 DAY)

前一周的最后一天：

select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 2 DAY)

The first day of the first two weeks：

select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 15 DAY)

The last day of the first two weeks：

select date_sub(curdate(),INTERVAL WEEKDAY(curdate()) + 9 DAY)

当前月的第一天：

SELECT concat(date_format(LAST_DAY(now()),’%Y-%m-’),’01′)

当前月的最后一天：

SELECT LAST_DAY(now())

The first day of the previous month：

SELECT concat(date_format(LAST_DAY(now() – interval 1 month),’%Y-%m-’),’01′)

The last day of the previous month：

SELECT LAST_DAY(now() – interval 1 month)

The first day of the first two months：

SELECT concat(date_format(LAST_DAY(now() – interval 2 month),’%Y-%m-’),’01′)

The last day of the first two months：

SELECT LAST_DAY(now() – interval 2 month)

The first day of the current season：

select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-3 month),’%Y-%m-’),’01′)

The last day of the current season：

select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-1 month)

The first day of the previous season：

select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-6 month),’%Y-%m-’),’01′)

The last day of the previous season：

select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-4 month)

The first day of the first two seasons：

select concat(date_format(LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-9 month),’%Y-%m-’),’01′)

The last day of the first two seasons：

select LAST_DAY(MAKEDATE(EXTRACT(YEAR FROM CURDATE()),1) + interval QUARTER(CURDATE())*3-7 month)