Weekday Guessing Game

Current Year Game

Date: --/--

Time: 0.00s

Accuracy: 0.00%

Avg Time: 0.00s

Custom Year Range Game

Date: --/--

Time: 0.00s

Accuracy: 0.00%

Avg Time: 0.00s

Doomsday Algorithm Game

Year: ----

Time: 0.00s

Accuracy: 0.00%

Avg Time: 0.00s

Date Rush Game

Date: --/--

Time left: 60s

Accuracy: 0.00%

Avg Time: 0.00s

Total Correct: 0

Month Number Game

Month: ----

Time left: 60s

Accuracy: 0.00%

Avg Time: 0.00s

Total Correct: 0

Game Guide & Features

Quick Reference: Keyboard Shortcuts

Game Controls
  • Space Start game
  • R Restart game
Answer Keys
  • 1-7 Select weekday (Monday-Sunday)
  • 1-9,0,-,= Select month (1-12)

Game Overview

The Weekday Guessing Game helps you master the art of mental date calculations through various engaging game modes. Whether you're a beginner or an expert, there's a challenge for everyone!

Game Modes

Current Year Game

Perfect for beginners! Practice with dates from the current year only.

Features:
  • Month and day only display (year is fixed)
  • Unlimited time per guess
  • Performance tracking (accuracy & speed)
Pro Tip: Start here to build your foundational skills!

Custom Year Range Game

Challenge yourself with dates from any year between 1700 and 2100!

Features:
  • Adjustable year range
  • Complete date display
  • Great for century calculation practice
Pro Tip: Practice with smaller ranges first!

Doomsday Algorithm Game

The Algorithm Explained
Century Anchors:
1700s:Sunday (0)
1800s:Friday (5)
1900s:Wednesday (3)
2000s:Tuesday (2)
Doomsday Dates:
  • 4/4, 6/6, 8/8, 10/10, 12/12
  • 5/9, 9/5, 7/11, 11/7
  • Last day of February
  • Leap years: 1/11, 2/22
  • Non-leap years: 1/10, 2/21
Quick Algorithm Steps:
  1. Find century's anchor day
  2. Calculate year's contribution:
    • Divide last 2 digits by 12 (get quotient and remainder)
    • Add quotient + remainder + ⌊remainder/4⌋
  3. Add to anchor day and take modulo 7
  4. Count from nearest doomsday date

Date Rush Game

Test your speed and accuracy under pressure!

Features:
  • 60-second time limit
  • Rapid-fire date calculations
  • Available in current year and custom range modes
  • Score tracking for speed and accuracy
Challenge: Try to beat your high score!

Month Number Game

Master month-to-number associations quickly!

Features:
  • 60-second time limit
  • Month name to number conversion
  • Quick keyboard input (1-12)
Tip: Use the number pad for faster input!

Learning Strategy

Recommended Learning Path
  1. Master Month Numbers
  2. Practice Current Year dates
  3. Learn Doomsday Algorithm basics
  4. Expand to Custom Year Range
  5. Challenge yourself with Date Rush
Pro Tips
  • Use keyboard shortcuts
  • Practice mental arithmetic
  • Focus on accuracy before speed
  • Learn patterns within months