The Clip's internal clock does not keep running if the device's battery runs out.
The Clip needs to be connected to a computer with the Narrative Uploader installed to be synced (make sure you have an internet connection), and to calculate timestamps and apply them to photos. If you continuously charge the Clip with a wall outlet then the timestamp can also be affected.
To be sure that the Clip has the right time please charge your Clip via a computer.
If you still experience any issues with incorrect timestamps, please contact firstname.lastname@example.org.