I was able to fix in DBeaver 22.0.3 by going to the settings found in File -> Properties -> Editors -> Data Editor -> Data Formats -> select Timestamp from the "Type" drop down. I changed from the default to MM/dd/yyyy HH:mm

Looks like the default datetime export in dBeaver is interpreted incorrectly in excel. You can also add back in ":SS" to the end if seconds are needed for your export