The fastest way: Settings > General > Date & Time
Open the Settings app on your home screen. Tap General, then scroll down and tap Date & Time. You will see a toggle for Set Automatically — if it is already on (the switch is green), your iPhone is syncing with your carrier's network time and you do not need to do anything. If you want to set the time manually, turn that toggle off.
Once you turn off Set Automatically, two new fields appear: Time Zone and Set Date & Time. Tap Time Zone first and search for your city or region — this tells your phone where you are. Then tap Set Date & Time and use the scroll wheels to pick the correct date and time. Tap Done when you finish.
Key Takeaways
- Most iPhones automatically sync time with your carrier, so the time is usually correct without you doing anything.
- If you need to change the time manually, go to Settings > General > Date & Time and turn off the Set Automatically toggle first.
- Always set your time zone before setting the time itself, because the time zone affects how your phone displays the hours.
- If your time keeps reverting to the wrong setting, turn Set Automatically back on — manual changes do not stick if your phone is trying to sync.
Why your iPhone might show the wrong time
The most common reason is that Set Automatically is on but your phone has not connected to a network yet. If you just turned on your iPhone or switched airplane mode off, wait a minute or two for it to sync. If you are in a new time zone and the time still looks wrong after waiting, your phone may not have picked up the new zone from the network — manually setting the time zone usually fixes this.
Another reason is that you manually changed the time but Set Automatically is still on. Your phone will override your manual change the next time it syncs with the network. If you want the time to stay at what you set, keep Set Automatically turned off. If you want your phone to sync again, turn it back on.
When to use manual time instead of automatic
Most people should leave Set Automatically on. Your carrier sends the correct time to your phone constantly, so you do not have to think about it. The only common reason to turn it off is if you are testing something, troubleshooting a problem, or if your phone is not connecting to a network and you need the time to be correct right now.
If you turn off automatic syncing, remember to turn it back on when you are done. Leaving it off means your time will drift slowly out of sync over weeks or months, and you might miss appointments or see the wrong time on messages.
Changing time zone without changing the time itself
If you travel to a new time zone and want your iPhone to show the local time automatically, make sure Set Automatically is on. Your phone will pick up the new time zone from the network within a few minutes of landing and connecting to a carrier signal or WiFi.
If Set Automatically is off, you need to manually change the time zone in the same Date & Time menu. Tap Time Zone, search for your new city, and tap it. Your phone will adjust the displayed time to match the new zone. You do not need to touch the Set Date & Time field unless the actual time is also wrong.
What happens if you change the time on your iPhone
Changing the time affects how your phone timestamps messages, photos, and files. If you set the time backward, old messages might appear to be newer than they actually are. If you set it forward, new messages might look older. Apps that depend on the correct time — like banking apps, calendar apps, or apps that show live sports scores — may not work correctly until the time is fixed.
Some apps will refuse to open if they detect that your phone's time is very far off. This is a security feature: apps use the correct time to verify that certificates and security tokens are still valid. If your time is years in the past or future, the app thinks something is wrong and blocks you from using it. Turning Set Automatically back on fixes this when ready.
Checking if your time is actually syncing
The easiest way to check is to compare your iPhone's time to another device — a computer, a clock on the wall, or a friend's phone. If they match, your time is correct. If your iPhone is off by more than a minute, something is not syncing.
If the times do not match, first check that Set Automatically is on. If it is, restart your iPhone: hold the power button until you see the shutdown slider, slide it, wait 10 seconds, then hold the power button again until the Apple logo appears. After restart, wait a minute for your phone to connect to the network and sync. If the time is still wrong after restart, turn Set Automatically off and manually set the time, then turn it back on.
Frequently Asked Questions
Why does my iPhone time change by itself?
Your phone is syncing with your carrier's network time. This happens automatically when Set Automatically is on, which is the normal setting. If you manually changed the time and it keeps changing back, Set Automatically is overriding your change. Turn it off if you want your manual time to stick.
Can I change the time on my iPhone without changing the time zone?
Yes. Go to Settings > General > Date & Time, turn off Set Automatically, and tap Set Date & Time. Change only the time using the scroll wheels, leaving the time zone as it is. Your phone will now show the time you set in your current time zone.
What if my iPhone time is correct but my lock screen shows a different time?
Restart your iPhone. Sometimes the lock screen display does not refresh when the time syncs. Hold the power button, slide to shut down, wait 10 seconds, then hold the power button again to turn it back on. The lock screen should show the correct time after restart.
Does changing the time affect my alarms or reminders?
Yes. If you set the time backward, alarms and reminders scheduled for times you just passed will go off when ready or be skipped. If you set the time forward, alarms may not go off at the time you expect. Always set your time back to the correct time as soon as possible to avoid missing alarms.
Can I set a different time for different apps?
No. The time on your iPhone is system-wide — all apps see the same time. If you need different times for different purposes, you would need to change your phone's time zone, but this affects everything on your phone, not just one app.