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Is you Date & Time set to Automatic?

Settings > General > Date & Time > Set Automatically [Enable]

Get help with the date and time on your iPhone, iPad, and iPod touch ...

If you still need help

If your device still shows an incorrect date, time, or time zone,2 change each setting instead of using Set Automatically. For example, you might have iOS 9 or earlier and your country or region or government changes the time zone or the observance of daylight saving time. If so, follow these steps:

1. Go to Settings > General > Date & Time. 
2. Turn off Set Automatically.
3. Now you can change the time zone or the date and time:3

• • Tap Time Zone and enter a city with the time zone that you need. (Not sure which city to enter? Use the time zone map on timeanddate.com to find a city with a time zone that matches your needs.) 
  • Or tap the date to change the date and time. 

1. The option to turn on Set Automatically might not be available with all carriers or in all countries and regions. If the device has a Screen Time passcode, then the option to turn on Set Automatically will be dimmed, or grayed out.
2. If the time on your iOS device is wrong after you sync it with your computer, your computer's time might be wrong. Check the time on your computer in System Preferences > Date & Time. You might want to select "Set date and time automatically."
3. Manual adjustments to time settings to change app behavior (like game timers) isn't recommended.