As for now it just encforces leading zeros to be added to dates (month and day mainly) whenever its value would otherwise occupy just one digit (values less than 10).

So instead of 96/1/9 you will see 96/01/09 as long as the hack is active. More features to come - hence the hack name.

Please note the application needs to internally call particular Palm OS' functions for this hack to take effect.

Most apps do, but if your favourite one is immune, you may try to ask the developers how do they format date and time strings or point to this hack for them to investigate if they can join the wagon (assuming they would will so of course).

Update Description:
v1.1a (2007.03.28):
Unfortunately v1.1 release archive featured old 1.0 version of the hack. If you got it downloaded, check About dialog. It it says 1.0 you need to fetch 1.1a which is correctly packed.