What day of the week was December 30, 1999?

The day of the week December 30th, 1999 fell on was a Thursday.

Sarah Knauss the American super-centenarian (b. 1880) died on this day in 1999. As did Fritz Leonhardt the German engineer, co-designed the Cologne Rodenkirchen Bridge and Fernsehturm Stuttgart (b. 1909) .