If i had a post dated paycheck?

and I accedentlly cashed it early (see i had two checks from the same company, one was last payday, and the one i cash was for today (1/28/11) but i cashed it last night.) I went to a local store and they took and and i didn't think anything of it, till i noticed the old paycheck in my car. I called them and told them, they said it was fine, and that the bank would get it prosessed tomorrow (today), since they did a late deposit to the bank...... Am I in the clear?