Recalculate a time- inferred date

[fhossfel]

It would be great if DateGroup supported something like refresh() to recalculate the relative dates. Ideally this would not require a reparse but even it does it seems to me a much cleaner API to have a refresh than to reparse the string everytime.

Background: i am using Natty for a caching servlet filter where I can specify expiry based on the refresh cacles of our data warehouse:

   <init-param>
       <param-name>EXPIRES</param-name>
       <param-value>tomorrow 8:00</param-value>
   </init-param>