What the day logo
What the Day
LearnPracticePlayDailyGuides
LearnGuidesPracticePlayDaily challengeLeaderboardAboutContactPrivacy
Copyright © 2026 Jesper Kiledal
All rights reserved
☕Buy me a coffee
What the day logo
What the Day
LearnPracticePlayDailyGuides

August 25, 1939 was a
Friday

August 25, 1939 was a Friday — that’s 31,700 days ago. Below you can see exactly how to work the weekday out in your head with the Doomsday algorithm, along with a few other facts about the date.

Weekday
Friday
Day of year
237 of 365
ISO week
Week 34
Leap year?
No
Zodiac sign
Virgo
Days ago
31,700

How to solve: August 25, 1939

  1. 1
    Century anchor1900s→Wednesday (3)
    Practice →
  2. 2
    Divide by 1239 ÷ 12→3
    Practice →
  3. 3
    Remainder of 1239 % 12→3
    Practice →
  4. 4
    Divide remainder by 43 ÷ 4→0
    Practice →
  5. 5
    Year's doomsday(3 + 3 + 3 + 0) % 7→2 → Tuesday
    Practice →
  6. 6
    Month doomsdayAugust→8th
    Practice →
  7. 7
    Distance25 − 8→17
    Practice →
  8. 8
    Final answer(2 + 17) % 7→5 → Friday

Related dates

Day beforeAugust 24, 1939 — ThursdayDay afterAugust 26, 1939 — SaturdayOne year earlierAugust 25, 1938 — ThursdayOne year laterAugust 25, 1940 — Sunday
Want to be able to do this for any date in seconds? Read the guide or practice the algorithm.
Did you know? Did you know that 'Black Friday' refers to the day after the U.S. Thanksgiving, which marks the beginning of the Christmas shopping season?