Date from a string and int value in ssis

Question

hi so my table is as follows
active      expirymonth     
expiryyear
0              October                         2014
0              February                            2015
1               January                        2012
and so on
now my requirement is that if active =0 then in a new table lets say LASTDATE and they want a date with the last day of the expiry month and year  and if active is anything else write NULL for eg
LASTDATE
10/31/2014
02/28/2015
NULL
I went to derived tables and made a new table called lastdate. What expression do i build in the expression builder to get the required result as i could not find a way to convert the text into int and then into a date

Answer 1

Hi Bharatb111,
If you want to achieve this using Derived Columns transform, you have to use following expression to first convert the month name value to integer:
([expirymonth]==”January”)?1:([expirymonth]==“February”)?2: ([expirymonth]==”March”)?3:([expirymonth]==“April”)?4:5
However, if we need to validate a couple of or even all of twelve months, the expression validation will be failed. So, the Derived Column approach is impossible.
To achieve your goal, you can use a Script Component to perform the date format conversion. This way, we can convert “dd/MMMM/yyyy(such as “01/October/2014”) format string value to “MM/dd/yyyy” (such as “10/01/2014”), and assign this value to a new output
column (assuming its name is “DateVal” and its data type is DT_DATE) of the Script Component. Then, we can drag a Derived Column under the Script Component and connect them. In the Derived Column, we can add a new column named “LASTDATE” with the following
expression:
([active]==0)?DATEADD(“d”,-1, DATEADD(“Month”),1,DateVal]):NULL(DT_DATE)
For the Script Component code snippet, please refer to Reza’s answer:
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/1661339c-252c-4197-9cfd-943e1d86b573/convert-a-string-to-date-format?forum=sqlintegrationservices 
Hope this helps.
Regards,
Mike Yin
TechNet Community Support