[TYPO3] first steps in extension progging

[T.M.Snyder]

Hi all,

i have made a simple extension for to getting started.
All dates are saved as timestamp.
Whenn I see all my records in the BE, the date is displayed as timestamp.
Ok, I can understand that, because it's in the db like this.

How can I achieve, that the timestamp from the db is shown as formatted date 
in the BE record listing?

Thanks
T.