Windows and Mac both let you change the time in Settings, not the system clock itself

Your computer's time comes from your system clock — a small battery-powered chip that keeps running even when the power is off. You cannot change the clock directly. What you can change is the time zone your computer displays, or you can sync to the internet to pull the correct time from a time server. Most of the time, syncing is the answer: your PC checks the internet automatically and corrects itself if it drifts.

If your time is wrong, the fastest fix is to let Windows or Mac sync to the internet. If you are offline or need to set a specific time zone, you can do that through Settings. Both take less than a minute.

Key Takeaways

  • Windows and Mac sync your time to the internet automatically, so if your time is wrong, check your internet connection first.
  • To change your time zone in Windows, open Settings, go to Time & Language, and select your zone from the dropdown.
  • On Mac, open System Settings, click General, then Date & Time, and choose your time zone.
  • If you need to set a specific time manually (rarely necessary), you can do that in the same Settings screens, but syncing to the internet is more reliable.
  • Incorrect time can cause problems with Windows updates, SSL certificates, and email, so keeping it accurate matters for your system's health.

How to change your time zone in Windows 11

Open Settings by pressing Windows key + I on your keyboard. On the left side, click Time & Language. You will see a section called Date & Time at the top.

Under Time zone, click the dropdown menu and select your zone from the list. Windows will explore the change when ready. If you want to turn on automatic syncing (which is usually on by default), make sure the toggle next to Set time automatically is switched on. This tells Windows to pull the correct time from the internet every time you connect.

If your time is still wrong after changing the zone, restart your computer. Sometimes Windows needs a restart to sync properly with the internet time servers.

How to change your time zone on Mac

Click the Apple menu in the top-left corner and select System Settings. Click General on the left sidebar, then click Date & Time.

You will see a dropdown for Time zone. Click it and search for your city or zone. Mac will update the time when ready. Make sure the toggle for Set date and time automatically is turned on — this keeps your Mac synced to internet time servers.

If you do not see the Date & Time option, your Mac may be set to a restricted account. Ask the administrator of your Mac to change the time zone for you.

Why your computer's time matters

An incorrect system time can cause real problems. Windows Update checks the time before it installs patches — if your clock is too far off, updates will fail silently. Email clients like Outlook will not sync properly if the time is wrong. Websites with SSL certificates (the lock icon in your browser) may refuse to load if your time is more than a few minutes off.

Your system time also affects file timestamps, which matters if you are backing up files or working on shared documents. If your time is in the past, your backup software may think your files are older than they actually are.

What to do if automatic syncing is not working

If you have turned on automatic syncing but your time keeps drifting, the problem is usually your internet connection. Check that you are connected to Wi-Fi or Ethernet. If you are connected but the time is still wrong, restart your computer — this forces Windows or Mac to contact the time servers again.

If restarting does not fix it, your system clock battery may be failing. This is rare on modern computers, but if your time resets every time you shut down, the battery inside your computer is likely dead. You will need to take your computer to a repair shop to have it replaced.

On Windows, you can also manually set the time if you need to. Go back to Settings > Time & Language > Date & Time and toggle off Set time automatically. Click Change under the time display and set it manually. Turn automatic syncing back on as soon as you can, because manual time is less reliable.

How to check if your time is syncing correctly

On Windows, open Settings > Time & Language > Date & Time and scroll down to Related settings. Click Additional date, time, & regional settings. In the window that opens, click Set the time and date. Click the Internet Time tab, then click Change settings. You will see the last time Windows synced and which server it used. If the sync time is recent (within the last few hours), your time is syncing correctly.

On Mac, there is no built-in way to see the last sync time. If your time is correct and the automatic toggle is on, syncing is working. If your time keeps drifting even with automatic syncing on, restart your Mac and check your internet connection.

Frequently Asked Questions

Why does my computer time change when I restart?

Your system clock battery is likely failing. When the power is off, the battery keeps the clock running. If it is dead, the clock resets to a default time every time you shut down. This requires a hardware repair, but automatic internet syncing will correct the time as soon as you turn the computer back on and connect to the internet.

Can I set my time to something other than my actual time zone?

Yes, but it is not recommended. You can turn off automatic syncing and set any time you want manually. However, this breaks email, updates, and file timestamps. If you need a different time zone temporarily for work, change your time zone in Settings instead — this is cleaner and does not confuse your system.

What if my time zone is not in the list?

Windows and Mac both include every major time zone. If you cannot find yours, search by the nearest major city in your zone. For example, if you are in a small town, search for the state capital or largest nearby city. The time zone will be the same.

Does changing the time zone affect my files or programs?

Changing the time zone does not delete or move files. Programs that depend on time (like email or backup software) will adjust automatically. File timestamps will show the correct local time going forward, but old files will keep their original timestamps.