Change your time zone in System Settings

Open System Settings on your Mac — click the Apple menu in the top-left corner, then select System Settings. In the sidebar, click General, then scroll down and click Date & Time.

You'll see a section labeled Time Zone with a dropdown menu showing your current location. Click that dropdown and type the name of the city or region where you want to set your time. As you type, macOS shows matching cities. Click the one you want, and your Mac updates immediately.

If you don't see the Time Zone section, look for a lock icon at the bottom of the window. Click it, enter your Mac password, and the settings become editable. This happens because changing the system time zone requires administrator permission.

Key Takeaways

  • Go to System Settings, click General, then Date & Time to find the time zone control.
  • Type a city name in the Time Zone dropdown to find and select your location.
  • If the Time Zone section is locked, click the lock icon and enter your password to unlock it.
  • Your Mac updates the time zone instantly once you select a new city.
  • The same settings control whether your Mac sets the time automatically or manually.

What happens when you change the time zone

When you select a new time zone, your Mac adjusts the clock to match that location. If it's 2 p.m. in New York and you switch to Los Angeles time, the clock changes to 11 a.m. — the actual time stays the same, but the display changes. Your calendar events, email timestamps, and file modification dates all shift to reflect the new zone.

If you have Set time zone automatically using current location turned on, your Mac ignores the manual time zone you just set and uses your location instead. If you want to keep a specific time zone even when you travel, turn this toggle off first. You'll find it in the same Date & Time settings window.

Automatic time zone versus manual selection

By default, Macs can detect your location and set the time zone automatically. This works if you have location services enabled and you're connected to the internet. The advantage is that your time zone updates when you travel — no manual changes needed.

If you turn off automatic time zone detection, you control the time zone yourself. This is useful if you work remotely across multiple zones and want your Mac to stay on one specific time, or if you travel frequently and don't want the clock jumping around. You can toggle this on or off anytime in the same Date & Time settings.

When your time zone won't change

If the Time Zone dropdown is grayed out or won't respond, your Mac is likely set to automatic time zone detection. Turn off Set time zone automatically using current location first, then the dropdown becomes active. You may need to click the lock icon and enter your password if the toggle is also locked.

Another reason the setting might not stick is if you're using a managed Mac at work. Some organizations lock system settings so employees can't change them. If you see a message about a configuration profile or management, contact your IT department — they control these settings remotely.

Setting the time manually if needed

In the same Date & Time window, you can also set the time and date manually instead of letting your Mac do it automatically. Turn off Set date and time automatically, and the time and date fields become editable. Click on the time or date, type the correct values, and press Enter.

Most people leave automatic time and date on — it's simpler and more reliable. But if your Mac's clock is wrong and you need a quick fix before the automatic update catches up, you can set it manually. Once automatic time is back on, your Mac syncs with the network time server again.

Checking your current time zone

You can see your current time zone without opening System Settings. Click the time in the top-right corner of your menu bar, and a small window pops up showing the date, time, and time zone name. This is also where you can quickly access Date & Time settings — click Date & Time Preferences at the bottom of that popup.

If you have multiple time zones you care about, you can add them to the menu bar clock. In Date & Time settings, look for Clock options and check Show date and time in menu bar. Some Mac users also add a world clock widget to their desktop to track multiple zones at once.

Frequently Asked Questions

Will changing my time zone affect my calendar events?

Your calendar events stay at the same moment in time, but they display in the new time zone. If you had a meeting scheduled for 2 p.m. New York time and you switch to Los Angeles, it shows as 11 a.m. The meeting itself doesn't move — only how your Mac displays it changes.

What if I travel and want my Mac to follow me automatically?

Keep Set time zone automatically using current location turned on. Your Mac uses location services and internet data to detect where you are and updates the time zone without you doing anything. Turn this off only if you want to stay on one time zone even when traveling.

Can I have two different time zones on one Mac?

Your system time zone can only be one location at a time. But you can add multiple time zones to your menu bar clock or use a world clock widget to see several zones at once. This lets you see what time it is in other places without changing your Mac's actual time zone.

Why does my time zone keep changing back?

If automatic time zone detection is on, your Mac resets the zone based on your location. Turn off Set time zone automatically using current location if you want to keep a specific zone. If you're on a work Mac, your IT department might be resetting it remotely through a management profile.

Do I need to restart my Mac after changing the time zone?

No. The time zone change takes effect immediately. You don't need to restart, log out, or close any programs. Your clock updates right away, and any new files or emails will use the new time zone.