I don't have a document for this date, well I do, but it's dated much later. Opa reveals in a letter much later in this year that today is the day he officially became engaged to Grandmother. I kinda thought they were already engaged, but I guess it was more in theory than an official thing!
So on January 7, on Opa's bed in the Zimmerman's house, my Grandmother's said yes to Opa's proposal. On January 7, 1944 in the midst of a war, a commitment to love was made.