Also, lots of the stuff I'm reading on Google now says that a post-dated check actually becomes a Promissory Note (as in the legal definition).
So, in other words, no matter what the legal situation in your specific state/province/territory/autonomous corporate sector, don't assume that the...
http://www.powersource.com/cccs/richard/banking.htm
Note that this is in Texas, but should give you some ideas.
Q. I gave someone a check, post dated. I assumed that it couldn't be cashed until the date on the check. I intended on putting enough money in the bank to cover the check before it...