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 that the vault is not opened with keys like in old days but by 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,enteredthe password,openedthe vault and robbed all the money. What is the password???