My friend Dario has written one:
Clock Check — By Dario Persechino
Clock Check is an application designed to aid CCTV engineers and Law Enforcement personnel when calculating the time discrepancies on CCTV systems.
The app calculates the difference between a ‘real time’ and a CCTV ‘system time’.
This difference can then be used within the app to calculate when on the CCTV system an incident should be searched for.
The app also provides a facility to save the details of checks for later statements or further calculations.