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Change the date and time on iPhone
The time zone on your iPhone is set automatically, but if you don’t have Location Services turned on or you don’t have service, you can change it manually.
Go to Settings
> General > Date & Time.
Turn off Set Automatically, then tap Time Zone.
Enter a location in the search field, then tap the result to change the time zone.
To change the default date and time, turn off Set Automatically, then change the date and time displayed.
Tip: To change the font color and style of the clock on the Lock Screen, see Change the clock style on the Lock Screen.