T-sql Monday before date

Question

I work at a college and our student management systems academic year start date is determined by the Monday on or before the 1st of August. I need to match this in my query, is there a way to easily get the date of the Monday on or before this date.

Accepted Answer

```
set datefirst 1; -- Make Monday the first day of the week

select dateadd(dd, -1*(datepart(dw, '2009-08-01')-1), '2009-08-01')
```

Returns July 27th, 2009, which is the Monday on or before August 1. Change it to 2005 when Aug 1 was a Monday and the query will return 08-01

T-sql Monday before date

Solution

Problem