Where to find the time settings on your device
The time settings live in different places depending on whether you use Windows, Mac, iPhone, or Android. On Windows, right-click the clock in the bottom right corner of your screen and select "Adjust date and time". On a Mac, open System Settings, click "General" in the sidebar, then select "Date & Time". On iPhone, go to Settings, tap "General", then "Date & Time". On Android, open Settings, scroll to "System", then tap "Date and time".
Most devices set the time automatically by connecting to a network time server — a computer that broadcasts the correct time over the internet. This is the default on nearly all devices, which is why your clock usually stays accurate without you doing anything. If your device shows the wrong time, automatic time sync is often the first thing to check.
Key Takeaways
- Automatic time sync is turned on by default on most devices and keeps your clock accurate without manual changes.
- If your time is wrong, toggling automatic sync off and back on usually fixes it within a few seconds.
- Manually changing the time requires you to turn off automatic sync first, or the device will override your change.
- Changing your time zone is separate from changing the time itself and is found in the same settings menu on all devices.
- Some programs and websites depend on your device's correct time to work properly, including email, banking, and security features.
Turning automatic time sync on and off
On Windows, the toggle for automatic time is labeled "Set time automatically" and appears at the top of the Date & Time settings. Turning it off lets you change the time manually, but most of the time you should leave it on. If your clock is wrong and automatic sync is already on, try turning it off for 10 seconds, then back on — this forces your device to contact the time server again.
On Mac, the same toggle is called "Set date and time automatically" and sits in the Date & Time pane. On iPhone and Android, the setting is usually called "Automatic date and time" or "Use network-provided time". Turning this off on a phone is less common than on a computer, because phones sync time through their cellular connection and rarely drift.
If automatic sync is off and you want to turn it back on, the process is the same: open the time settings and flip the toggle. Your device will when ready contact a time server and correct itself. You do not need to restart.
Manually setting the time when you need to
To change the time by hand, you must first turn off automatic sync. Once automatic sync is off, a field or slider appears that lets you set the hours and minutes. On Windows and Mac, you can click the time display and type in the new time. On iPhone, you scroll wheels to set hours and minutes. On Android, you tap the time field and type the new value.
After you set the time manually, automatic sync remains off until you turn it back on. This means your clock will not correct itself if it drifts — it will stay at whatever you set it to. For this reason, manually changing the time is usually only necessary if your device's clock battery has failed or if you are troubleshooting a specific problem.
One common reason to manually change the time is if you are setting up a device that has been in storage or powered off for a long time. The internal clock may have lost track of the current date and time. Setting it manually once, then turning automatic sync back on, will let the device correct itself going forward.
Changing your time zone separately from the time
Your time zone setting tells your device what region you are in, and it is separate from the actual time. If you move to a different time zone or travel, you usually only need to change the time zone — the device will automatically adjust the displayed time. On Windows, this setting is called "Time zone" and appears directly below the automatic sync toggle. On Mac, it is in the same Date & Time pane. On iPhone and Android, look for "Time zone" in the same menu where you found automatic date and time.
If you turn off automatic time sync and then change your time zone, your device will not automatically adjust the displayed time to match. This can create confusion: your time zone might say "Eastern" but your clock shows Pacific time. To avoid this, leave automatic sync on when you travel, and only change the time zone. The device will handle the rest.
Why the correct time matters for your device
Your device's internal clock affects more than just the display in the corner. Email programs use the time to sort messages and detect spam. Banking websites check that your device's time matches their server's time before letting you log in — if your clock is too far off, they will refuse the connection. Security certificates on websites have expiration dates, and your browser checks your device's time to verify that a certificate is still valid. If your time is years in the past, your browser will block websites as potentially unsafe.
Backup programs, file syncing services, and cloud storage all depend on accurate timestamps to know which version of a file is newest. If your device's time is wrong, these services can overwrite newer files with older ones or fail to sync at all. For these reasons, keeping automatic time sync on is one of the simplest ways to prevent problems.
What to do if your device keeps showing the wrong time
If your device's time is wrong even with automatic sync turned on, the problem is usually that your device cannot reach a time server. On Windows and Mac, check that you have an active internet connection. On a phone, make sure you are connected to Wi-Fi or have cellular service. Once you have a connection, wait 30 seconds and check the time again.
If you have an internet connection and the time is still wrong, try restarting your device. This clears temporary glitches and forces your device to contact the time server again. If the time is still incorrect after a restart, your device's internal clock battery may be failing — this is rare on phones but more common on older computers. In that case, contact the device manufacturer or a repair service.
On Windows, you can also try manually syncing the time by opening Command Prompt as administrator and typing "w32tm /resync". This command forces Windows to contact its time server when ready. On Mac, restarting is usually the fastest fix.
Frequently Asked Questions
Will changing the time affect my files or programs?
Changing the time manually can confuse backup programs and file syncing services, which rely on timestamps to track which files are newest. For this reason, avoid manually changing the time unless necessary. If you do change it, turn automatic sync back on as soon as possible so your device can correct itself.
Can I set a different time for different programs?
No. Your device has one system clock, and all programs read from it. Some programs let you display time in different formats or time zones, but they all use the same underlying time. If you need a program to show a different time, you would need to change your device's system time, which affects everything.
What happens if I change my time zone while traveling?
If automatic time sync is on, changing your time zone will automatically adjust the displayed time to match your new location. Your device will also update any scheduled tasks or alarms to the new time zone. When you return home, change the time zone back and automatic sync will adjust everything again.
Why does my phone's time sometimes jump ahead or back by an hour?
This usually happens during daylight saving time transitions in spring and fall. Your device's automatic sync detects the time zone change and adjusts the clock forward or backward by one hour. If this happens at an unexpected time, check whether daylight saving time recently started or ended in your region.
Can I manually set the time on my phone without turning off automatic sync?
No. Automatic sync overrides any manual time change within seconds. You must turn off automatic sync first, make your change, and then decide whether to turn it back on. For most situations, leaving automatic sync on is the better choice.