RACK 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 a
password, you
can't kill me since i am the only one who
knows
the password and every day the password is
different The robber

shot the cashier,
entered the
password opened the vault and robbed
all the
money. WHAT IS THE PASSWORD???