Navigate Here: Utilities > System Calendars
You can browse all system calendars on the Browse System Calendars page.
A brief summary of each system calendar displays in the table. The summary includes Calendar Name and Is Base Calendar. You can sort the system calendars by clicking the linked column headers. If there are too many records to display in one page, you can use the navigation control to view another page.
You can quickly find the system calendar you want by using the search function. Enter search conditions in the search fields and click the Search button. The system calendar will be filtered and the table will show the records that match the search conditions. Click the Reset button to clear the search conditions.
Click the Edit icon 
at the end of the row. The system will then open Calendar Setting screen for editing the select calendar.
Click the Add icon 
and the system will open the Calendar Setting screen for adding a new system calendar, the calendar day settings are initially copying from the current system base calendar.
Note: There is only one system base calendar exists, all other new system calendars will be created as not base calendar.