Well I looked into my grandfather's notebooks (one is more engineering oriented and the other is normal day-to-day army life) to try to date the Gilsdorf Bridge definitively. The engineering notebook, from which the Gilsdorf entry is taken, has dates with years in the begining - Dec 5 through Dec 22, 1943. Then there are about 3 blank pages followed by an entry dated 24 February. I am led to assume that this is 1945 (he didn't use it for more than a year?) due to the fact that the dates go through 3 May (Heillbronn Bridge) and then goes into his trip home. The journal of his trip home (July 14 - August 6) is interesting and have those scanned for future entries.
The entries that flank the Gillsdorf Bridge are the Heilbronn Bridge on 22 April (which as I mentioned before is discussed again in May) and Gailsdorf Bridge on 30 April.
I wish I had an engineering background so I could make sense of some of these entries, but alas it's not to be. Looking through the other journal does lead me to believe, however, that there are a lot of similarities between the normal day-to-day then as there is now. I only wish I were as organized as he was! The other journal (from which the Christmas entry is taken) begins June 5, 1944 and goes through April 3, 1945.