Custom field date => sort threads by this date ?

[cakissimo]

Hello,

I don't speak english very well, so sorry for this

I "build" a forum dedicated to referencing french free contests (list of websites promotions to win price...) and members who posted a thread have a Textbox field (with a Text Mask Filter to DATE ) MUST be completed.

This date is the deadline for participation for each contest...i'm looking for a way to sort thread by "deadline for participation" ,it would be much easier for my moderators to remove the finished contests topics.

...and maybe after that ,ideally, it's was a way to automatically move or delete topics with time exceeded ?

Tell me if my question is not understandable...
Thanks