The energy efficient control is an important and popular task nowadays. E.g. heater unit may decrease temperature when there is no people inside a premise and this save energy.
WebHMI itself has calendar, scripts to describe the necessary periods and respective actions for the connected equipment. But when you have many devices distributed over area with same holiday and working day schedule it is very convinent to share the schedule to many WebHMIs.
The working day and weekends calender is located in Level2 - Resources menu:
There you can select day type: