Enlightenment To Your Mood

Crack your Brainz

CRACK YOUR BRAINS:
On 28th Feb, 2012 (Tuesday) a robber went to rob a bank. He threatened to kill the cashier if he didn't open the vault. The cashier told him the vault is not opened with keys but with a password. You can't kill me since I am the only one who knows the password and everyday the password is different.
The robber shot the cashier, entered the password, opened the vault and robbed all the money.
What is the password?