Yes, I did some reading on this after I posted and it was signed at 5am but came into effect at 11am that day (11th hour of 11th day of 11th month). It was signed in
Le Wagon de l'Armistice which, incidentally, is where Hitler forced the French to surrender in June 1940. The Germans took it to Germany but burned it in 1945 (long story). There is a replica in place in Compiègne Forest in France where the 1918 armistice was signed. If you ever take the tour they will tell you all about 1918 but do ask your guide about 1940 so that you can be met with stony silence