apt-get update – release file expired

I was goin to update the server today when i walked up on this problem:

E: Release file expired, ignoring http://debian.lth.se/debian/dists/squeeze-updates/Release (invalid since 3d 1h 22min 1s)

Howto fix:

You can use this command to pass the errors:
apt-get -o Acquire::Check-Valid-Until=false update

or remove the complain source from: /etc/apt/sources.list