What day of the week was December 31, 1990?

The day of the week December 31st, 1990 fell on was a Monday.

George Allen the American football player and coach (b. 1918) died on this day in 1990. As did Vasily Lazarev the Russian physician, colonel, and astronaut (b. 1928) , Giovanni Michelucci the Italian architect, designed the Firenze Santa Maria Novella railway station (b. 1891) .