I. Configure a working calendar

For better management, Kepler - Color fields | SLA & Custom actions gives you the possibility to configure one or more working calendar 

Configuration 

1. Add a calendar (Administration >SLA Calendars > Calendar Management)

2. To configure the calendar, Fill in the following fields

1. Set the name of the new calendar.
2. Set the description of the new calendar.
3. Click on the checkbox to choose the working day of the week.
4. Define the start time of work for each working day.
5. Define the end time of work for each working day.
6. Add new holidays to the calendar.
7. Set the date of the holiday.
8. Is it a repeated or exceptional holiday? ( Checked = Repeated).
9. Click 'ADD' to add the holiday.
10. After filling all the fields, save the new calendar by clicking on 'SAVE'.