Ford Ranger Owner's Manual page 196

Audio unit clock and date displays
Example
• current set time between 12:01 and
12:29 will change to 12:00 exactly
• current set time between 12:30 and
12:59 will change to 1:00 exactly.
Note: If the power supply to the unit is
interrupted (if the fuse blows or the vehicle's
battery is disconnected), the clock will need
to be reset.
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