I looked back at the example I sent more carefully and there is the following note:
Caveats and Additional Notes
You will notice that I have divided the U64 by 10^7 before converting to timestamp. This is because timestamp takes an input of seconds (it represents the number of seconds that have passed since Midnight, Jan 1, 1904), and the U64 contains values in 100s of microseconds (or tenths of milliseconds). This may vary a little bit for different cameras, so if you are not getting an accurate timestamp, check to see what the quotient is. You may need to adjust the constant for your camera.
As you can see, the actual value returned by the timestamp should be determined by the camera. Check there to make sure that it is being interpreted correctly. It seems that your program gives a x-y of 1s if the U64 is really returning tenths of milliseconds.
