Where to find the time settings on Windows and Mac

On Windows, right-click the time in the bottom-right corner of your screen and select Adjust date and time. This opens the Settings app directly to the Date & Time panel. On Mac, click the Apple menu in the top-left corner, select System Settings (or System Preferences on older versions), then click General and Date & Time.

Both operating systems let you set the time manually or have it update automatically. The automatic option is usually the better choice because your computer syncs with internet time servers, which keeps your clock accurate without you having to think about it.

Key Takeaways

  • Windows users right-click the system clock and select Adjust date and time; Mac users go through System Settings to find Date & Time.
  • Turning on automatic time updates means your computer stays synchronized with internet time servers and you never have to adjust it manually.
  • If your time keeps drifting wrong even with automatic updates on, your computer's internal battery may be failing and needs replacement.
  • Changing your time zone is a separate setting from changing the actual time, and both are in the same Date & Time panel.

Setting the time automatically on Windows

Open the Date & Time settings (right-click the clock, then Adjust date and time). Look for the toggle labeled Set time automatically and make sure it is turned on. Windows will then contact time servers on the internet and adjust your clock to match. This usually happens in the background without you seeing anything happen.

If you see a message saying the setting is managed by your organization, your computer is on a work network and your IT department controls the time settings. In that case, contact them if the time is wrong.

Setting the time automatically on Mac

In System Settings, go to General > Date & Time. You will see a checkbox for Set date and time automatically. Make sure it is checked. Your Mac will then sync with Apple's time servers and keep itself current.

Below that checkbox, you can also see which time server your Mac is using. The default is usually fine, but if you want to use a different one, you can select it from the dropdown menu.

Changing the time zone

Your time zone setting is separate from the actual time. If you move to a different part of the country or world, you need to update your time zone so your computer shows the correct local time. On Windows, in the Date & Time settings, look for Time zone and click the dropdown to find your location. On Mac, the time zone option is in the same Date & Time panel.

If you travel frequently or work across multiple time zones, you may want to turn off automatic time zone detection (if your device has it) so you can manually control which zone your computer uses. This prevents your computer from switching zones unexpectedly when you cross a border or connect to a new network.

Setting the time manually when automatic updates are off

If you turn off automatic time updates, you will see an option to set the date and time by hand. On Windows, click Change under the date and time fields. On Mac, click the lock icon to unlock the settings, then click the date and time fields to edit them directly.

Manual time setting is rarely necessary on modern computers. The only common reason to do it is if your internet connection is down and you need the correct time for something urgent. Once your connection is back, turn automatic updates back on so your clock stays accurate.

What to do if your time keeps changing or drifting

If your computer's time is consistently wrong even with automatic updates turned on, the problem is usually one of three things: your internet connection is unstable, your computer's internal clock battery is dying, or your system clock is set to a time zone far from your actual location.

Start by checking your internet connection — run a speed test or try loading a website. If that works, restart your computer and check the time again. If the time is still wrong after a restart, your computer's CMOS battery (a small coin-shaped battery inside the machine) may be failing. This battery keeps the system clock running even when the computer is off. Replacing it requires opening your computer, so contact a repair shop or your device manufacturer for help.

Why your computer's time matters

An accurate system clock affects more than just knowing what time it is. Your computer uses the time to timestamp files, verify security certificates for websites, and coordinate with cloud services. If your time is very wrong — more than a few minutes off — websites may refuse to load, files may not sync properly, and you may have trouble logging into accounts.

This is why automatic time updates are the default on both Windows and Mac. Keeping your clock synchronized is a small but important part of keeping your computer secure and functional.

Frequently Asked Questions

Why does my computer time change when I restart?

If your time jumps forward or backward when you restart, automatic time updates are likely turning on and correcting a clock that drifts when the computer is off. This is normal. If it happens every time you restart, your internal clock battery may be weak.

Can I set my computer to a different time than my actual local time?

Yes, you can set any time you want manually, but this will cause problems with file timestamps, security certificates, and cloud syncing. Only do this if you have a specific reason and understand the consequences. Automatic updates will override manual changes if they are turned on.

What if I don't have internet and need to set the time manually?

You can set the time manually in the Date & Time settings. On Windows, click Change; on Mac, unlock the settings and click the date and time fields. Once your internet is back, turn automatic updates on again so your clock stays accurate.

Does changing the time affect my files or programs?

Changing the time can affect file timestamps and cause programs that rely on accurate time (like email clients or security software) to behave oddly. Avoid manual time changes unless necessary. If you do change it, restart your computer and turn automatic updates back on as soon as possible.