Time stamp for BioBench

I am acquiring EMG data with BioBench while acquiring gait data from another source simultaneously. To correlate the data, it's important that the date stamps match. I would like to know where the time stamp comes from, and if there is a way to get more precision (milliseconds instead of seconds). Also, can I get more precision when I export, since this chops it off to the nearest minute.
Thanks!

The gait data can't be acquired with BioBench since it is from a motion capture package that acquires data in a completely different way with lots of complicated analysis involved. It processes dozens of frames per second from several video cameras to find the markers etc. I want to match the movement with the EMG signal exactly, to see when the movement begins in relation to the EMG signal. Therefore, I need to know exactly at what time each point in the BioBench file takes place in order to find out how much earlier the EMG signal started than the movement. Knowing when the EMG signal started to the nearest second is not nearly good enough resolution to say anything meaningful about the time difference between the onset of the EMG signal and the movement. The
whole point of acquiring data at up to 1000 Hz is defeated if I only know the absolute time to the nearest second. For anyone who can't acquire all of their data with a DAQCard (motion capture, force plate, etc), the data can't be correlated if the creation time isn't accurate and precise, which really makes BioBench useless for data acquisition or analysis.
Is there anyway to get the creation time to a better resolution? And does the creation time correspond exactly to the first point in the data? I think this would be a necessary improvement for many users.

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