Setting a future timestamp based off another timestamp field value

[Anonymous]

I would like the abilitiy to create a timestamp of a future date based off a current timestamp field. 

For example:

Trial starts date is 1/12/14
Trial length is 14 days

I need to set the "trial end date" timestamp to 1/26/14.

Salesforce can't (easily) do this right now. Seems pretty straight forward. 

[Anonymous]

Caleb it works! 

Thanks so much for your help. 

[Anonymous]

We just built out a workflow in SF to populate a date when a trial end date is populated. Called it trial date minus28. It seems to be working.