Calendar exceptions
If you want to add exceptions to your calendar (e.g., public holidays, extra working days), you can do so by setting the calendar in the Attendance/absence > Calendar menu - Calendar exceptions button.
Exceptions can be added to the calendar manually or by bulk import.

You can add an exception manually using the Add exception button. After filling in the available fields, selecting the desired exception type, and saving, the exception will be automatically added to the employee's calendar.

Public holidays can be imported into the calendar in bulk using the Import button. Select the country and year for which you want to import public holidays.

To set up list fields, go to the main system settings - you'll find them under the wrench symbol in the top black bar. In the left panel, select List fields, and in the drop-down list on the right, select Location. Add the code you found in the calendar exceptions list to the desired country.

After saving the country code, import the holidays into the calendar as described above. If the holidays were successfully imported, they will automatically be added to the calendar exceptions list.