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 the first sunday of the upcoming month. What is the best method to accomplish this with a T-SQL query?

Thanks

Answer 1

try this:

Declare @D Datetime 
Set @D = [Some date for which you want the following months' first sunday]
Select DateAdd(day, (8-DatePart(weekday, 
    DateAdd(Month, 1+DateDiff(Month, 0, @D), 0)))%7, 
    DateAdd(Month, 1+DateDiff(Month, 0, @D), 0))

EDIT Notes:

The first of next Month is given by the expression:

DateAdd(Month, 1+DateDiff(Month, 0, @D), 0)

or by: which can be modified to give the first of the month two months from now by changing the 1 to a 2:

DateAdd(Month, 2+DateDiff(Month, 0, @D), 0) 

EDIT: In response to @NissanFan, and @Anthony: to modify this to return the first Monday Tuesday Wednesday, etc, change the value 8 to a 9, 10, 11, etc....

Declare @Sun TinyInt Set @Sun = 8
Declare @Mon TinyInt Set @Mon = 9
Declare @Tue TinyInt Set @Tue = 10
Declare @Wed TinyInt Set @Wed = 11
Declare @Thu TinyInt Set @Thu = 12
Declare @Fri TinyInt Set @Fri = 13
Declare @Sat TinyInt Set @Sat = 14
Declare @D Datetime, @FONM DateTime -- FirstofNextMonth 
Set @D = [Some date for which you want the following months' first sunday]
Set @FONM = DateAdd(Month, 1+DateDiff(Month, 0, @D),0)

Select 
  DateAdd(day, (@Sun -DatePart(weekday, @FONM))%7, @FONM) firstSunInNextMonth,
  DateAdd(day, (@Mon -DatePart(weekday, @FONM))%7, @FONM) firstMonInNextMonth,
  DateAdd(day, (@Tue -DatePart(weekday, @FONM))%7, @FONM) firstTueInNextMonth,
  DateAdd(day, (@Wed -DatePart(weekday, @FONM))%7, @FONM) firstWedInNextMonth,
  DateAdd(day, (@Thu -DatePart(weekday, @FONM))%7, @FONM) firstThuInNextMonth,
  DateAdd(day, (@Fri -DatePart(weekday, @FONM))%7, @FONM) firstFriInNextMonth,
  DateAdd(day, (@Sat -DatePart(weekday, @FONM))%7, @FONM) firstSatInNextMonth

Answer 2

Just an FYI rather then coming up with some code to do this how about using a calendar table.

Take a look at this: http://web.archive.org/web/20070611150639/http://sqlserver2000.databases.aspfaq.com/why-should-i-consider-using-an-auxiliary-calendar-table.html

This also may help: http://www.sqlteam.com/forums/topic.asp?TOPIC_ID=99696