[Typo3-dev] ['ctrl']['label'] generated by a function?

[Thomas Murphy]

Hello everyone,

my problem: The label field in my extension should be a date-string. 
It's only shown by it's equivalent mysql or unix-timestamp...
I would like to parse it through some kind of date() function, to show 
it in readable form.

Is this possible? I've been searching in Typo3 Core API (this stuff is 
great!) but have not found a solution yet.

bye,
Thomas