# Set Multiple Time Zones

Cloud Voice lets you define more than one time zone on the same system, so teams in different regions can run their calls and schedules against their own local clock. This page walks through adding the time zones your organization needs.

## Why use multiple time zones

A single system-wide time zone works only when everyone shares the same working day. Companies with offices in more than one region, or with staff spread across the world, need schedules that reflect each location.

Say you have offices in the United States, the United Kingdom, and China. You can keep US Pacific as the default time zone, add separate time zones for the UK and China, and then build business hours and holidays for each one. Every team then works and answers calls against its own local hours, and customers reach the right people at the right time of day.

## Before you begin

- Your system firmware must be **84.18.0.59** or later.
- You can define up to **24** time zones in total, and that count includes the default time zone.

## Add a time zone

1. Sign in to the PBX (Private Branch Exchange) web portal and open **Call Control > Business Hours and Holidays**.
2. In the side panel, select **Add**.

   ![The Business Hours and Holidays side panel with the option to add a new time zone](/images/pbx/add-time-zone.png)

3. Fill in the time zone details in the dialog that opens.

   | Setting | Description |
   | --- | --- |
   | Name | A label that makes the time zone easy to recognize. |
   | Time Zone | The region whose local time you want to apply. |
   | Daylight Saving Time | Turn Daylight Saving Time (DST) on or off to match the region. |
   | Feature Code | Filled in automatically with a system-generated code. Use it to switch or subscribe to the Business Hours and Holidays status for this particular time zone. |
   | Assign to Extension | Optional. Apply this time zone to a group of extensions at once. Once assigned, those extensions inherit the business hours and holidays you set for the time zone. |

   :::note
   How the feature code can be used, and who is allowed to use it, are governed by the settings under **Call Features > Feature Code > Switch Business Hours and Holidays Status**.
   :::

   :::note
   To change the time zone for a single extension instead, go to **Extension and Trunk > Extension**, select the edit icon ![Edit](/images/pbx/edit.png) for that extension, and open **Features > Business Hours > Time Zone**.
   :::

4. Select **Save**.
5. Repeat steps 2 through 4 for each additional time zone you need.
6. Reboot the PBX to apply the changes.

   :::caution
   Rebooting ends every active call and briefly takes the phone system offline while it restarts. Add all the time zones you need first, then run the reboot during a maintenance window or after business hours so you interrupt as few calls as possible.
   :::

## Result

The new time zones are now available on the system.

## Next steps

With your time zones in place, [Set Business Hours](/pbx/administrator-guide/set-global-business-hours/) and [Create a Holiday](/pbx/administrator-guide/create-a-holiday/) for each one.