The quickest way to change your iPhone's time

Open Settings, tap General, then Date & Time. Toggle off Set Automatically if it's on. Tap the time display and use the plus and minus buttons to adjust the hours and minutes to what you need. When you're done, toggle Set Automatically back on if you want your phone to sync with your carrier's time again.

If you only need to change the time zone — say you've traveled somewhere — you can leave Set Automatically on and just change your time zone in that same menu. Your iPhone will then show the correct local time without you having to set it manually.

Key Takeaways

  • Manual time changes require you to turn off Set Automatically first, or the phone will override your change within seconds.
  • Changing your time zone alone is faster than changing the actual time — just pick your location and the phone adjusts automatically.
  • If you turn off Set Automatically to set a custom time, remember to turn it back on later so your phone stays accurate.
  • Your iPhone gets its time from your cellular carrier or Wi-Fi network when Set Automatically is on, so manual changes only stick when it's off.

Why your iPhone might not hold the time you set

If you change the time but it reverts a few seconds later, Set Automatically is still on. This setting tells your iPhone to pull the correct time from your carrier or internet connection instead of using what you typed in. It's on by default because it keeps your phone accurate without you having to think about it.

The only reason to turn it off is if you want your iPhone to show a time that doesn't match your actual location — which is rare. Most people who think they need to change the time actually just need to change their time zone instead.

Changing your time zone without manual adjustment

Go to Settings > General > Date & Time and look for Time Zone. Tap it and search for your city or region. Your iPhone will immediately show the correct time for that location, and Set Automatically will keep it accurate from then on.

This is what you want if you've traveled, moved, or your phone is showing the wrong time because it's locked to an old time zone. You don't have to touch the actual time — just tell your phone where you are, and it figures out the rest.

When you might need to set a custom time manually

Custom times are uncommon. You might set one if you're testing an app that depends on a specific date or time, or if you're troubleshooting something that requires the phone to think it's a different moment. Once you're done testing, turn Set Automatically back on so your phone returns to the real time.

If you're trying to change the time for any other reason — like making an appointment show up at a different hour — that's not something the phone's time setting controls. You'd change the time in the Calendar app or the event itself instead.

The difference between 12-hour and 24-hour time

Your iPhone can display time in either format. Go to Settings > General > Date & Time and toggle 24-Hour Time on or off. This changes how the clock appears throughout your phone — in the status bar, lock screen, and notifications — but it doesn't change the actual time, only how it's displayed.

Turning this on or off won't affect any alarms, timers, or scheduled events you've already set. It's purely a display preference and won't cause your phone to lose track of what time it actually is.

What to do if the time keeps changing on its own

If your time jumps around or changes without you touching it, Set Automatically is on and your phone is syncing with your network. This is normal behavior — your carrier or Wi-Fi connection is correcting the time to keep it accurate. You don't need to do anything.

If you want the time to stay exactly where you put it, turn off Set Automatically. But be aware that without it, your phone's time can drift and become inaccurate over days or weeks. Most people leave it on for this reason.

Frequently Asked Questions

Why does my iPhone time change back after I set it?

Set Automatically is still on. Your phone is pulling the correct time from your carrier or internet and overriding what you typed in. Turn off Set Automatically in Settings > General > Date & Time to make your custom time stick.

Can I set different times for different apps?

No. Your iPhone has one system time that all apps use. If you need an event or reminder to show a different time, change it within that specific app — Calendar, Reminders, or Clock — not in the phone's system settings.

What happens if I turn off Set Automatically and never turn it back on?

Your phone's time will slowly drift and become inaccurate. After a few weeks, it might be off by several minutes. Turn Set Automatically back on to let your phone sync with the network and correct itself.

Does changing the time affect my alarms or scheduled events?

Alarms and events are tied to specific times, not to the phone's clock setting. If you change your system time, existing alarms and events may trigger at unexpected moments until you change the time back or adjust them individually in their apps.

How do I change the time if I don't have cellular service or Wi-Fi?

You can still manually set the time. Turn off Set Automatically in Settings > General > Date & Time and adjust it yourself. Once you reconnect to a network, turn Set Automatically back on to sync with the correct time.