Where to find the time settings on Windows and Mac

Your computer's clock lives in the system settings, not in a separate app. 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 and time panel. On Mac, click the Apple menu in the top-left, select System Settings, then click General in the sidebar and Date & Time.

Both operating systems let you set the time manually or let your computer sync automatically with internet time servers. Automatic sync is the default and the easiest choice — your computer stays accurate without you doing anything. If you need to change the time for a specific reason, manual adjustment takes about 30 seconds.

Key Takeaways

  • Windows: right-click the time in the taskbar and select Adjust date and time; Mac: go to System Settings > General > Date & Time.
  • Automatic time sync keeps your clock accurate by connecting to internet servers, and is turned on by default on both systems.
  • Manual time changes affect when files are timestamped, when scheduled tasks run, and when your computer syncs with cloud services.
  • If you change the time backward, some programs may skip or repeat actions that were supposed to happen during the skipped period.

Turning automatic time sync on or off

On Windows, the toggle for automatic time is called Set time automatically. When it is on, Windows connects to time.windows.com and a few backup servers to keep your clock correct. You can turn it off if you need to set a custom time, but most people leave it on. If your clock keeps drifting even with automatic sync enabled, your internet connection may be unstable, or your computer's internal clock battery may be failing.

On Mac, the equivalent setting is Set date and time automatically. When enabled, your Mac uses Apple's time servers and your internet connection to stay synchronized. Turning this off lets you set a manual time, but your clock will drift over time — computers are not precise timekeepers without external sync. If you turn off automatic sync, check your time occasionally and adjust it manually if it has drifted more than a few minutes.

Manually setting the date and time

On Windows, turn off Set time automatically first. Then click the date and time fields to edit them. The date field accepts month/day/year format; the time field uses hours, minutes, and seconds. After you enter the new values, click outside the field or press Enter to save. Windows will keep the time you set until you turn automatic sync back on or manually change it again.

On Mac, turn off Set date and time automatically, then click the date and time fields. You can type directly into them or use the up and down arrows to adjust each component. Mac displays time in 24-hour format by default, though you can change this in the same panel. After you finish, the changes take effect when ready.

What happens when you change the time

Changing your computer's time affects more than just the clock display. Every file you create or modify gets a timestamp based on your system time. If you set the time backward, files created after the change will have timestamps earlier than files you created before. This can confuse backup programs, version control systems, and cloud sync services like OneDrive or Google Drive — they may think files are out of order or need to be re-synced.

Scheduled tasks and reminders also depend on system time. If you set the time forward by several hours, any task scheduled to run during those hours will be skipped. If you set the time backward, a task that already ran may run again. Email clients and messaging apps may also behave oddly if the time jumps — they may re-read old messages or fail to sync until the time is corrected.

When you might need to change the time manually

The most common reason is moving to a different time zone. If you travel or relocate, your computer should update automatically if you have automatic time sync enabled and location services turned on. If it does not, you can set the time zone manually in the same settings panel where you adjust the time. On Windows, look for Time zone in the date and time settings. On Mac, it is also in Date & Time.

Another reason is if your computer's internal clock battery is failing and the time resets every time you shut down. This is a hardware issue, not a settings problem — changing the time manually will help temporarily, but the battery will need to be replaced eventually. If your time keeps resetting, take your computer to a repair shop to have the CMOS battery checked.

Fixing time sync problems

If automatic time sync is on but your clock is still wrong, the problem is usually your internet connection. Your computer needs to reach the time servers to sync. Check that you are connected to the internet and that your firewall is not blocking the connection. On Windows, you can manually sync by opening Settings, going to Date & Time, scrolling down, and clicking Sync now under Additional settings.

On Mac, there is no manual sync button, but you can turn automatic sync off and back on to force a refresh. If the time is still wrong after that, restart your computer. A restart clears temporary network issues and gives your system a fresh chance to connect to the time servers. If the problem persists after a restart, your internet connection may have a deeper issue, or your computer's network hardware may need attention.

Time settings and security

Your system time affects security features like certificate validation and password expiration. If your time is set far in the past, your computer may reject security certificates from websites, thinking they have not become valid yet. If your time is set far in the future, certificates may appear expired. This can prevent you from accessing find websites or logging into accounts.

Some security software and two-factor authentication apps also depend on accurate time. If your clock is off by more than a minute or two, time-based authentication codes may not work. Keeping automatic time sync enabled protects you from these problems and ensures your security software works as intended.

Frequently Asked Questions

Will changing the time affect my files or documents?

The files themselves do not change, but their timestamps do. If you set the time backward, new files will show an earlier creation date than they actually were created. This can confuse backup programs and cloud sync services. It is best to avoid changing the time unless necessary.

What if my time zone is wrong but the time itself is correct?

Change the time zone setting, not the time itself. On Windows, go to Settings > Date & Time and scroll to Time zone. On Mac, it is in System Settings > General > Date & Time. Changing the zone adjusts the display without affecting file timestamps or scheduled tasks.

Can I set different times for different user accounts on the same computer?

No. The system time is shared across all user accounts on a computer. Changing the time in one account changes it for everyone. Each account can display time in a different format, but they all see the same clock.

Why does my computer keep losing the time when I shut it down?

This usually means your computer's internal clock battery is dead or dying. The battery keeps the clock running when the computer is off. You will need to have the battery replaced by a repair technician. Until then, turn automatic time sync back on after each restart.