August 1, 1981 was a

Saturday

How to solve: August 1, 1981

1. 1
   Century anchor1900s→Wednesday (3)
   Practice →
2. 2
   Divide by 1281 ÷ 12→6
   Practice →
3. 3
   Remainder of 1281 % 12→9
   Practice →
4. 4
   Divide remainder by 49 ÷ 4→2
   Practice →
5. 5
   Year's doomsday(3 + 6 + 9 + 2) % 7→6 → Saturday
   Practice →
6. 6
   Month doomsdayAugust→8th
   Practice →
7. 7
   Distance1 − 8→-7
   Practice →
8. 8
   Final answer(6 + -7) % 7→6 → Saturday