Symptoms
- Time and date prompt appears every time camera is turned on
- Photo file timestamps are wrong or reset to a default date
- Settings reset only after camera has been off for a while
- Otherwise camera functions normally
Likely causes
- CommonInternal backup battery depletedA small coin-cell-style battery keeps the clock running when the main battery is removed; it eventually depletes.
- CommonMain battery removed for extended periods without charging the backup cellThe backup cell is usually trickle-charged by the main battery during use.
- PossibleCamera left completely uncharged and unused for a long timeBoth batteries can drain fully during long storage.
- PossibleBackup battery reaching end of its lifeThese small cells typically last several years but do wear out.
- Less commonInternal clock circuit faultWould persist even after charging normally for an extended period.
What to do
- Insert a charged main battery and leave the camera powered on or charging for several hours to recharge the internal backup cell.
- Set the date and time again after charging and see if it holds after the camera is turned off overnight.
- Avoid leaving the main battery out of the camera for long stretches if this keeps happening.
- Check your camera model's manual for whether the backup battery is user-replaceable.
- If replaceable, order the correct small backup battery and replace it following the manual's instructions.
- If not user-replaceable, a repair shop can replace the internal backup cell.
- If the time still resets after a fully charged backup battery, the clock circuit itself may be at fault.
Tools and parts
- Small screwdriver (if backup battery is replaceable)
Camera backup clock batterySearch: “backup battery for [camera model] clock”
When to call a pro
If charging the backup battery for several hours doesn't fix it, a repair shop can replace the internal backup cell.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.