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, 2013 was a
Tuesday

July 23, 2013 was a Tuesday — that’s 4,703 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
Tuesday
Day of year
204 of 365
ISO week
Week 30
Leap year?
No
Zodiac sign
Leo
Days ago
4,703

How to solve: July 23, 2013

  1. 1
    Century anchor2000s→Tuesday (2)
    Practice →
  2. 2
    Divide by 1213 ÷ 12→1
    Practice →
  3. 3
    Remainder of 1213 % 12→1
    Practice →
  4. 4
    Divide remainder by 41 ÷ 4→0
    Practice →
  5. 5
    Year's doomsday(2 + 1 + 1 + 0) % 7→4 → Thursday
    Practice →
  6. 6
    Month doomsdayJuly→11th
    Practice →
  7. 7
    Distance23 − 11→12
    Practice →
  8. 8
    Final answer(4 + 12) % 7→2 → Tuesday

Related dates

Day beforeJuly 22, 2013 — MondayDay afterJuly 24, 2013 — WednesdayOne year earlierJuly 23, 2012 — MondayOne year laterJuly 23, 2014 — Wednesday
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 in Spanish-speaking countries, Tuesday the 13th (and not Friday) is considered an unlucky day?