You can use kron command.
This is an example:
kron occurrence NIGHT at 20:00 recurring
policy-list SHUT_DIALPEER
kron occurrence DAY at 8:00 recurring
policy-list NOSHUT_DIALPEER
kron policy-list SHUT_DIALPEER
cli dial-peer voice 119 pots
cli shutdown
kron policy-list NOSHUT_DIALPEER
cli dial-peer voice 119 pots
cli no shutdown
Regards.