[O] changing all timestamps in a document by a certain value?

[Matt Price]

Hi,

I'm revising my course syllabi for next Fall and therefore need to update all the timestamps.  In this case, I need to add 361 days to every stamp.  Is there a function somewhere that can read a timestamp, convert it to a numerical value, change the value, and then record the new value in the right format? It would make my life easier if I could at least define a macro to do this.  

Thanks guys!
Matt