Log into your phone system management console, refer to article below:
https://helpdesk.vcausupport.com/en-au/article/logging-into-vcloud-pbx-management-system/
Go to settings on the left
Select Timezone, Office Hours & Holidays
Scroll to the bottom to the Configure Holidays section
Press the Add button
Enter Name for the holiday, eg: Australia Day
Set the time range from when the holiday starts and ends
Press OK
https://helpdesk.vcausupport.com/en-au/article/logging-into-vcloud-pbx-management-system/
Go to settings on the left
Select Timezone, Office Hours & Holidays
Scroll to the bottom to the Configure Holidays section
Press the Add button
Enter Name for the holiday, eg: Australia Day
Set the time range from when the holiday starts and ends
Press OK
Updated on: 12 / 01 / 2019