I have this tag of xml code that I'd like to amend:

<Column Name="datebeg" DataType="datetime" Source="data" Value="periodstart"/>

The Period Start is a specific piece of data from a field in the application I'm working with.

If I leave this as it is, the result in my file will be 2012-03-24 which is the period start date.

I'd like my XML to look at this field, report it back into the file but then add 13 days to result so instead of seeing 2012-03-24 you'd see 2012-04-06.

Any thoughts on the coding I can use to accomplish this?