It is 7 for est.
Actually it's -5
The system time of your LAN will display on the KHG screen, but when it records to your SD card it will use the timezone conversion. Which is why the last entry in his photo is for Feb 18 at 6:45am.
I know the CoralVue video says to put a 7 in there for EST, but that is actually 7 hours ahead of the International dateline, and we are 5 hours behind the international dateline.
(It took me awhile to figure out why it wasn't recording the time in the log as what was provided by the LAN and confirmed by the time on the KHG machine itself).
Sounds like you should check and adjust your setting as well.
Just FYI, once you change it, it won't alter the recorded results, but your new tests will record with the proper time and date then!