Listed below are the step by step instructions for changing the iPhone time to 12 hour time format.
Step 1: Press the menu button on iPhone to access the Home screen.
Step 2: Tap the Settings icon on the Home screen to launch the iPhone Settings screen.
Step 3: Tap the General option in the Settings screen.
Step 4: Scroll down and tap the Date & Time option in the General Settings screen.
Step 5: Now you can turn on the 12 hour time format by setting the value of 24-Hour Time to Off.