May 10, 1869 was a

Monday

How to solve: May 10, 1869

1. 1
   Century anchor1800s→Friday (5)
   Practice →
2. 2
   Divide by 1269 ÷ 12→5
   Practice →
3. 3
   Remainder of 1269 % 12→9
   Practice →
4. 4
   Divide remainder by 49 ÷ 4→2
   Practice →
5. 5
   Year's doomsday(5 + 5 + 9 + 2) % 7→0 → Sunday
   Practice →
6. 6
   Month doomsdayMay→9th
   Practice →
7. 7
   Distance10 − 9→1
   Practice →
8. 8
   Final answer(0 + 1) % 7→1 → Monday