DigiKam overriding date taken


I’m work on scanning a large amount of old family photos. For simplicity sake, after scanning I set all the date taken to 1-1-1900 using Windows, then change the dates of those I know. However, when I open up digikam it rewrites all the dates to the date they were scanned. Is there a way to stop it from doing this? If not, how do I change the date taken on digikam?