Power Platform Blog

Holidays in CRM are stored in the CalendarRules entity but unfortunately Retrieve and RetrieveMultiple messages are not supported for this entity.  Below is a snippet of code that will help to find the CalendarId that contains the holidays and how to retrieve the individual holidays themselves.

           var org = (from o in Context.OrganizationSet
                          select o).FirstOrDefault();

            var businessClosureCalendarId = org.BusinessClosureCalendarId.Value;
            var businessClosureCalendar = (from c in Context.CalendarSet
                                           where c.CalendarId == businessClosureCalendarId
                                           select c).FirstOrDefault();

            var calendarRules = businessClosureCalendar.CalendarRules;

Enjoy!