OSMtracker v1.0.1 on Android v10 on SM-A405FN
When uploading a GNSS trace, the date & time of said upload is always reported (within OSMtracker) as the Unix epoch (plus one hour (perhaps because of being on BST as opposed to GMT, currently)).
This is true for all uploads, consistently.
The OSM site itself reports the correct date & time of those same uploaded traces.