I'll give it a shot. Looks a bit kludgy and I've been typing this on my phone while sitting on the toilet. What am I doing with my life?

from datetime import datetime 

now = datetime.now()
year = now.strftime('%Y')
month = now.strftime('%m')
day = now.strftime('%d')
tenyearsago = datetime(year-10, month, day)
print(tenyearsago.strftime('%d.%m.%Y')