Get first Sunday of next month using T-SQL

Question

Looking for a way to get the date in the format \"11/1/2009\", which would be the first sunday of next month. I want to run this query after the first sunday in october to get

Answer 1

Here is the non-system specific way to determine the first Sunday of the following month:

First, get the current month and add one month. Next, set the date of that variable to be on the first. Next, find the day value of that date (let's assume Mondays are 1 and Sundays are 7). Next, subtract the day value of the 1st of the month from the day value of Sunday (7).

You now have the number of days between the first of the month and the first Sunday. You could then add that to the date variable to get the first Sunday, or, since we know the first of the month is 1, you could just add one to the difference (found in that last step above) and that is the date of the first Sunday. (You have to add one because it's subtracting and thus if the first of the given month IS Sunday, you'd end up with 0).

I have been looking through the T-SQL documentation and it is not at all intuitive as to how how you would use my method, but you will need the concept of "day of week number" to make it work no matter what.