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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.
How do I replace the gmaptz.img?
This is one of the tcx files that won't upload, "Corrupted time data. More Information." is the error on Strava. About 1 in 10 rides actually upload.
https://drive.google.com/open?id=16TvXsZULxTfBseYQFvjtZJk30CaiIz3Y