How to change password automatically ?

Dear Sir/Madam Hello,

if i want to create seven password on administrator. Is it possible that these password are automatically changed accourding to the week name?
eg.
sun ******
mon *****
tue *****
wed *****
thr *****
Fri *****
sat *****

and they should be change with in 24 hours.
so that,is is possible?
If yes then give me solution please?