Trying to add month with a Date

Question

Hi All,
I am trying to add month with a date. it will take the earlier month and add one month . Here is my code
declare @CollectionDate date='10-30-2014'
select @CollectionDate
;WITH CTemp AS (
SELECT TransactionDate=CAST(@CollectionDate AS DATE) ,RemainingTransaction=1
UNION all
SELECT TransactionDate=DATEADD(MONTH,1,CONVERT(date, CONVERT(varchar(4), YEAR(TransactionDate))
+'-'+CONVERT(varchar(2),MONTH(TransactionDate))
+'-'+ CONVERT(varchar(2),DATEPART(day, @CollectionDate)))),
RemainingTransaction+1
FROM CTemp
WHERE RemainingTransaction < 9
select * from CTemp
When I am giving date 10-28-2014 then it is working fine. But when the date is 10-31-2014 then it shows me the error
Msg 241, Level 16, State 1, Line 3
Conversion failed when converting date and/or time from character string.
I can undestand it is for the month of February but how do I overcome it?
Can anyone help me on this?
Thanks in advance!!
Niladri Biswas

Answer 1

Try the below:
--To find the last day of the month, use the below:
declare @CollectionDate date='10-30-2014'
select @CollectionDate
;WITH CTemp AS (
SELECT TransactionDate=CAST(@CollectionDate AS DATE) ,RemainingTransaction=1
UNION all
SELECT TransactionDate=cast(DATEADD(day,-1,DATEADD(month,MONTH(Transactiondate)-1,DATEADD(year,YEAR(TransactionDate)-1900,0))) as DATE),
RemainingTransaction+1
FROM CTemp
WHERE RemainingTransaction < 9
select * from CTemp
--Just to add a month, use the below
declare @CollectionDate date='10-30-2014'
select @CollectionDate
;WITH CTemp AS (
SELECT TransactionDate=CAST(@CollectionDate AS DATE) ,RemainingTransaction=1
UNION all
SELECT TransactionDate=DATEADD(month,-1,TransactionDate),
RemainingTransaction+1
FROM CTemp
WHERE RemainingTransaction < 9
select * from CTemp
EDIT: You may change -1 to 1 if you want the future months.(I am bit confused whether you are looking for previous months or future months.)