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' tab on the left

Select Timezones, Office Hours & Holidays

Press configure on the day you want to set your operating hours. You can also set a break time here

Set Time Range in 24 hour clock format

Press OK

https://helpdesk.vcausupport.com/en-au/article/logging-into-vcloud-pbx-management-system/
Go to 'settings' tab on the left

Select Timezones, Office Hours & Holidays

Press configure on the day you want to set your operating hours. You can also set a break time here

Set Time Range in 24 hour clock format

Press OK

Published on: 12 / 01 / 2019