[TYPO3-mvc] Ho do you get the timestamp from a DateTime property?

[Stephen Bungert]

I have a datetime property which works fine, but now I want to get the 
timestamp and not have a datetime object returned - I want to compare the 
datetime field in a query. What do  I have to do to get the timestamp (as 
stored in the database) and not a datetime object/array?

Stephen.