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Could be a problem with the gmaptz.img file, i.e. the time map.
First try using the webupdater to see if it offers you a time zone map update if it does then take it.
If it does not then mount the Edge to the computer and delete the following file
Garmin\gmaptz.img (This is the time zone map)
Run the Webupdater after deleting the file and it will reinstall the map for you.
Cross post from Strava thread
About 1 in 3 rides not updloading from Garmin to Strava - bad time data messages.
I have tried using the online resource to fix fit files to no avail.
How can I stop this happening in future?