STEPS
TOOLS
Go to the main menu/homescreen
Go into Settings
Go into "General" settings
Go to "Date and Time"
Click on where the date and time are shown
Scroll up or down to the desired date and time
Ta Da! You have just changed your IPhone's date and time
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How to change the date and time on an iphone (ios7)

Change the Date and Time on an IPhone (IOS7)