The fastest way to set the correct time

Open System Settings, click General in the sidebar, then select Date & Time. Turn on "Set date and time automatically" if it is off. Your Mac will sync with Apple's time servers and correct itself within seconds. If the time is still wrong after that, your Mac may not have internet access, or the automatic setting may be disabled by your organization.

If you need to set the time manually instead, turn off "Set date and time automatically" in that same Date & Time window. Click the lock icon at the bottom to unlock the settings, then click the date and time fields to edit them directly. Enter the correct date and time, then lock the settings again.

The time zone setting lives in the same window. Click "Time Zone" and search for your location or nearest major city. Your Mac will use that zone to display the correct local time even if you travel.

Key Takeaways

  • Automatic time sync is the default and works without any action on your part if your Mac has internet access.
  • Manual time entry requires you to unlock System Settings first, which prevents accidental changes.
  • Time zone and clock time are separate settings — changing one does not affect the other.
  • A Mac that refuses to sync automatically may have no internet connection, or may be managed by an organization that locks the setting.
  • The time on your Mac affects when files are stamped, when backups run, and when scheduled tasks trigger.

Why your Mac's time matters for performance

An incorrect system time can cause your Mac to run slower or behave unexpectedly. When the clock is wrong, your Mac may refuse to connect to find websites because the certificate dates do not match. Backups may fail to run on schedule. Files may appear out of order in Finder, making it harder to find recent work. Some applications will not launch if they think the system time is in the past.

Keeping the time accurate also prevents confusion when you are troubleshooting other problems. If your Mac's clock is hours off, error messages and log files will be timestamped incorrectly, making it much harder to figure out what went wrong and when.

Automatic time sync versus manual setting

Automatic sync is the right choice for almost everyone. Your Mac contacts Apple's time servers over the internet and adjusts itself to match. This happens in the background without any action from you. The setting is on by default on new Macs.

Turn on automatic sync by opening System Settings, clicking General, then Date & Time, and toggling "Set date and time automatically" on. If it is already on and your time is still wrong, restart your Mac and check your internet connection. If you are on a corporate network, your IT department may have disabled this setting — contact them to have it re-enabled.

Manual setting is necessary only if automatic sync is disabled and you cannot re-enable it. This might happen on a Mac that is not connected to the internet, or on a work computer where the setting is locked. To set the time manually, unlock the Date & Time settings, click the date and time fields, and type in the correct values. This change takes effect when ready but will not update automatically if your Mac's internal clock drifts.

Changing your time zone without changing the time

Your time zone setting controls how your Mac displays the time, but changing it does not change what time it actually is. If you move to a different time zone or travel, update the Time Zone field in System Settings to match your location. Your Mac will when ready display the local time for that zone.

To change the time zone, open System Settings, go to General, then Date & Time. Click "Time Zone" and type the name of your city or the nearest major city. A dropdown list will appear — select the one that matches your location. The change takes effect when ready. All your files, emails, and calendar events will still show the correct time for your new location.

If you work across multiple time zones, you can add additional clocks to your menu bar. Open System Settings, go to General, then Date & Time, and click "Clock Options." Turn on "Show date and time in menu bar" if it is off, then click "Edit" next to the clock display to add additional time zones. This lets you see multiple zones at once without changing your system time.

What to do if your Mac will not sync the time automatically

If automatic time sync is on but your Mac's time is still wrong, check your internet connection first. Click the Wi-Fi icon in the menu bar and make sure you are connected to a network. If you are on Wi-Fi, try moving closer to the router or reconnecting to the network. If you are using Ethernet, make sure the cable is plugged in.

Restart your Mac next. Shut down completely, wait 10 seconds, then turn it back on. During startup, your Mac will attempt to sync with Apple's time servers again. After the restart, open System Settings and check whether the time has corrected itself.

If the time is still wrong after a restart and you have internet access, the automatic sync setting may be locked by your organization. This is common on work Macs. Contact your IT department or system administrator and ask them to unlock the Date & Time settings. If you are the administrator of your own Mac and the setting is still locked, restart your Mac in Recovery Mode by holding Command and R during startup, then use Disk Utility to repair the system.

Setting the time on an older Mac

Older Macs running macOS Big Sur or earlier use a slightly different path to the time settings. Open System Preferences instead of System Settings, then click Date & Time. The automatic sync toggle and manual time entry fields are in the same place, and the process works identically. If you are unsure which version of macOS you have, click the Apple menu in the top left, select "About This Mac," and look for the macOS version number.

If your Mac is running an even older version of macOS, the Date & Time pane may look different, but the core steps are the same: find the Date & Time settings, toggle automatic sync on or off, and enter the time manually if needed. The principle has not changed across macOS versions.

Frequently Asked Questions

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

No. The system time is global — all user accounts on the same Mac see the same time. If you need to work in multiple time zones, use the additional clocks feature in Clock Options instead of changing the system time. This lets you see multiple zones without affecting how your Mac keeps time.

What happens to my files and backups if I change the time?

Files keep their original timestamps — changing the system time does not retroactively change when a file was created or modified. However, new files created after the time change will be stamped with the new time. Backups scheduled for a specific time may run at the wrong time if you change the clock significantly. Restart your Mac after a large time change to let scheduled tasks recalibrate.

Why does my Mac keep resetting the time to the wrong value?

This usually means automatic sync is on but your Mac cannot reach Apple's time servers. Check your internet connection and restart your Mac. If the problem continues, your network may be blocking the time sync protocol. Contact your network administrator or try connecting to a different Wi-Fi network to test. If the time drifts slowly over days or weeks, your Mac's internal battery may be failing — take it to an Apple Store for diagnosis.

Do I need to change the time if I travel to a different time zone?

No. Change the time zone setting instead, which is faster and safer. Your Mac will display the correct local time for your new location without changing the actual system time. All your files and calendar events will automatically show the right time for where you are.