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

July 23, 1973 was a
Monday

July 23, 1973 was a Monday — that’s 19,313 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
Monday
Day of year
204 of 365
ISO week
Week 30
Leap year?
No
Zodiac sign
Leo
Days ago
19,313

How to solve: July 23, 1973

  1. 1
    Century anchor1900s→Wednesday (3)
    Practice →
  2. 2
    Divide by 1273 ÷ 12→6
    Practice →
  3. 3
    Remainder of 1273 % 12→1
    Practice →
  4. 4
    Divide remainder by 41 ÷ 4→0
    Practice →
  5. 5
    Year's doomsday(3 + 6 + 1 + 0) % 7→3 → Wednesday
    Practice →
  6. 6
    Month doomsdayJuly→11th
    Practice →
  7. 7
    Distance23 − 11→12
    Practice →
  8. 8
    Final answer(3 + 12) % 7→1 → Monday

Related dates

Day beforeJuly 22, 1973 — SundayDay afterJuly 24, 1973 — TuesdayOne year earlierJuly 23, 1972 — SundayOne year laterJuly 23, 1974 — Tuesday
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 the third Monday of January is often referred to as 'Blue Monday' and is considered the most depressing day of the year?