New Feature: Search/Sort on dates

New Feature Request:

     Ability to search/sort on dates particularly on "Date Page Created"
          Enhancements: -"Date Page Modified" and possibly "Last Date Viewed"
                                             (if tracked by Zim or if author is willing to add such tracking)
                                        -Any other dates already tracked
                                        -Embedded dates (Probably pretty difficult)

Ex: Show me: all sub-pages created before xx/xx/xxxx
                                        all sub-pages not modified since xx/xx/xxxx
                                        all sub-pages not viewed since creation
                                        all sub-pages with embedded dates in range xx/xx/xxxx to xx/xx/xxxx

This, or parts of this, is offered in similar applications (Treepad) and is useful for organizing/purging large text databases and retrieving chronological information.

Submitted as a bug at the (email) request of Jaap Karssenberg (RE: Question #228685).

Zim V0.60 on Ubuntu Linux 12.10