To set up the opening times and days of the center, you can go to Planning -> Centers Configuration

Here you can see the list of centers you have registered, and you can create a set up by clicking(You'll find just one center in most cases)

Once inside the center you will see a menu on the left. The General section will show the details of your centre. 

The Subcenter section is not used very often, unless there are more centers depending on a main one. If that is the case, you can create as many as you need.

The Timetable section is where you define the opening times of your center and define which days it will be closed, or operating with a different schedule than usual.

In the last section, Holidays, we define the days in which the center is open, but special fares apply.

Once you have clicked on Timetable, you will see the days and times your center is open/closed. Here is an example:

As you can see in the image above, the first entry is the usual opening hours, from 1st of January to 31st of December. The rest of the entries are special days, when the center is closed or has a different opening time.

If you press  or edit  one of the entries you can see a screen like the one below

If you want to set up your usual schedule then you might want to select the option "weekly", and you can enter the opening times from Monday to Sunday.

If you close one or more days every week you will need to uncheck the "open" checkbox below the opening times of those days.

To add a day that has different opening hours than usual or a day when the center is closed, you can create a new entry and then select "Daily". If it has a different opening hours then enter the hours on the Timeslot option, and if it is closed all day you can uncheck the option "Open".