How to make a calls ring to a group or extension on the weekend only on sl-1000

[Zero6]

Hi all,

I wanted to know how to make an incoming call ring only to a specific group or extension during the weekend.
Example so normally all incoming calls ring on ext 25, but when it is Friday 5pm to Sunday 11:59pm all calls ring to either a group or ext 30
At 12 am Monday all calls ring at ext 25 till Friday 4:49 pm

How can I do this?

Thank you in advance