The fastest way to change your iPhone's time
Open Settings, tap General, then Date & Time. Toggle off Set Automatically if it is on. Tap the time display, adjust the hours and minutes with the plus and minus buttons, then tap Done. The change takes effect when ready.
If you do not see a time picker, your phone is set to update automatically from your carrier or Wi-Fi network. Turning off Set Automatically unlocks manual control. Once you disable it, the time field becomes editable.
Most people leave Set Automatically on because it keeps your phone correct when you travel or your carrier updates the network time. Turn it off only if you have a specific reason — for instance, if you are testing an app that depends on the system clock, or if your phone is picking up the wrong time zone.
Key Takeaways
- Manual time changes require you to turn off Set Automatically in Settings > General > Date & Time first.
- Once automatic time is off, tap the time display to open the picker and use the plus and minus buttons to set hours and minutes.
- Leaving Set Automatically on means your iPhone updates its time from the network and ignores any manual changes you make.
- If you change the time manually and it reverts after a few seconds, Set Automatically is still enabled and overriding your choice.
Why your manual time change might not stick
If you set the time manually but it jumps back to the correct time within seconds, Set Automatically is still enabled. Your phone is receiving the correct time from your carrier or Wi-Fi and overwriting what you just entered. Go back to Settings > General > Date & Time and confirm the toggle is off.
Another reason the time might revert: your phone reconnected to Wi-Fi or cellular service after you changed it. The moment it reconnects, if Set Automatically is on, it fetches the network time again. If you need the time to stay wrong, keep Set Automatically off and avoid switching networks.
When to turn off automatic time updates
You might need manual control if you are testing software that reads the system clock — for example, an app that shows different content based on the date, or a game that unlocks features at a certain time. Developers often change the device time to test these features without waiting for real time to pass.
Another case: if your phone is picking up the wrong time zone and Set Automatically is choosing the wrong offset. This is rare, but it can happen if you are in a region with unusual time zone rules or if your carrier's time data is out of sync. In that case, turn off automatic updates and set the time and time zone manually.
How to set the time zone separately
In Settings > General > Date & Time, you will see a Time Zone field below the time picker. Tap it and search for your city or time zone name. Your iPhone will show matching results — select the one closest to your location. The time zone controls what offset your phone uses from Coordinated Universal Time (UTC).
If Set Automatically is on, your phone chooses the time zone based on your location services and carrier data. If you turn off automatic updates, you can set the time zone independently from the time itself. This is useful if you want to stay on your home time zone while traveling, or if you are in a place where the automatic detection is wrong.
Resetting to automatic time if you changed it by mistake
If you manually changed the time and want to go back to automatic updates, open Settings > General > Date & Time and toggle Set Automatically back on. Your phone will when ready fetch the correct time from the network and overwrite whatever you set manually.
There is no undo button — the moment you turn Set Automatically on, the old manual time is gone and replaced with the network time. If you need to remember what you changed it to, take a screenshot before you turn automatic back on.
What happens to alarms and reminders when you change the time
Alarms and reminders are tied to specific times of day, not to a fixed moment. If you change your iPhone's time backward by two hours, an alarm set for 8 a.m. will still go off at 8 a.m. — but the actual wall-clock time will be different. This can be confusing if you are testing software and forget that you changed the system time.
Calendar events work the same way. If you set an event for 3 p.m. and then move your phone's time forward by three hours, the event will still show as 3 p.m. in your calendar, but it will occur at what your phone thinks is 3 p.m. — which is three hours ahead of real time. Always turn automatic time back on before you rely on alarms or calendar events.
Frequently Asked Questions
Why does my iPhone keep changing the time back to the correct time?
Set Automatically is still on. Your phone is receiving the correct time from your carrier or Wi-Fi network and overwriting your manual change every few seconds. Go to Settings > General > Date & Time and make sure the toggle next to Set Automatically is off before you try to change the time again.
Can I change the time zone without changing the actual time?
Yes. In Settings > General > Date & Time, turn off Set Automatically, then tap Time Zone and select a different region. Your phone will adjust the time offset but keep the same moment in time — so if it is noon in New York, it becomes 9 a.m. in Los Angeles. The actual time of day shifts, but you did not manually edit the clock.
What if I do not see the time picker when I tap the time?
Set Automatically is on. The time field is read-only when automatic updates are enabled. Tap the toggle to turn it off, then tap the time display again. The picker should appear and let you adjust the hours and minutes.
Do I need to restart my iPhone after changing the time?
No. The time change takes effect when ready. Your iPhone does not need to restart, and you do not need to close and reopen any apps. However, if an app was running when you changed the time, it may not notice the change until you close and reopen it.
Will changing the time affect my backup or iCloud sync?
Changing the system time does not corrupt your backup or iCloud data. However, if you have Set Automatically off and your phone's time drifts far from real time, some cloud services may reject uploads or show incorrect timestamps on files. Turn automatic time back on to avoid this.