Ever wonder how long you've been alive, down to the day? What about the precise amount of time since you met (or married) that special someone? How long 'till your next anniversary? DateDiff is a simple program that allows the user to find out how much time has elapsed between any two dates, in terms of days, months and years as well as the total number of days. Multiple date combinations ("events") can be stored, modified or deleted. The list of events is backed up with a HotSync, so that, if necessary, they can be restored after a hard reset. DateDiff is freeware, distributed under the GNU General Public License.
Visit http://www.foo-bar.org/palmos/ to get the sources. Update Description:
Version 3.1 (2002.03.21):

• Added ISO 8601 weeks functionality: dates may now be optionally displayed with week numbers
• Date formats (when not in weeks mode) can be changed to any one of four alternatives
• Help texts are stored in compressed format, saving a few Kb in application size
• Source divided into numerous different files for easier management