May 21, 1927 was a

Saturday

How to solve: May 21, 1927

1. 1
   Century anchor1900s→Wednesday (3)
   Practice →
2. 2
   Divide by 1227 ÷ 12→2
   Practice →
3. 3
   Remainder of 1227 % 12→3
   Practice →
4. 4
   Divide remainder by 43 ÷ 4→0
   Practice →
5. 5
   Year's doomsday(3 + 2 + 3 + 0) % 7→1 → Monday
   Practice →
6. 6
   Month doomsdayMay→9th
   Practice →
7. 7
   Distance21 − 9→12
   Practice →
8. 8
   Final answer(1 + 12) % 7→6 → Saturday