Calendar
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Cheat Sheets
Study MaterialCalendar Cheat Sheet
Calendar is one of the most important and logical topics in Quantitative Aptitude and is frequently asked in SSC, Banking, Railway, UPSC, Defence, Insurance, CAT, and other competitive examinations.
This cheat sheet helps candidates understand odd days concepts, leap years, day calculations, same calendar years, month and day codes, and shortcut techniques for solving calendar-based questions quickly and accurately in exams.
About This Cheat Sheet
Complete guide to Calendar problems for competitive exams:
Basic Calendar Concepts
- Odd Days Concept
- Ordinary Year
- Leap Year
- Weekday Calculations
Odd Days Rules
- Ordinary Year = 1 Odd Day
- Leap Year = 2 Odd Days
- Century Odd Days
- Total Odd Day Calculations
Day & Month Codes
- Sunday = 0
- Monday = 1
- Month Code Tricks
- Day Number Methods
Finding Day of Date
Methods to determine the day on any given date using odd days and calendar formulas.
Leap Year Concepts
- 366 Days Rule
- Century Leap Year Rule
- February 29 Concept
- Divisibility Conditions
Same Calendar Years
- Calendar Repetition
- Next Same Calendar Year
- Leap Year Effect
- Year Matching Tricks
Special Calendar Problems
- Last Day of Century
- First Day of Year
- Odd Days Between Dates
- Date Difference Problems
Shortcut Tricks
Fast solving methods, day calculation shortcuts, and exam-oriented calendar techniques.
Topics Covered
| Topic | Description |
|---|---|
| Odd Days | Extra days beyond complete weeks |
| Ordinary Year | Year containing 365 days |
| Leap Year | Year containing 366 days |
| Century Odd Days | Odd day pattern in centuries |
| Day Codes | Numeric values assigned to weekdays |
| Month Codes | Codes used for month calculations |
| Finding Day of Date | Calculating weekday for a given date |
| Same Calendar Years | Years having identical calendars |
| First Day of Year | Finding weekday of January 1 |
| Last Day of Century | Weekday calculations for centuries |
| Odd Days Between Dates | Difference of weekdays between dates |
| Leap Year Rules | Conditions for identifying leap years |
| Date Difference Problems | Comparing two calendar dates |
| Shortcut Tricks | Fast solving methods for exams |
Why This Cheat Sheet is Important
Understand Calendar Concepts
↓
Improve Logical Thinking
↓
Apply Shortcut Techniques
↓
Solve Date Problems Faster
↓
Score Better in Exams
Competitive Exams Covered
- SSC CGL
- SSC CHSL
- Bank PO & Clerk
- Railway Exams
- UPSC CSAT
- Defence Exams
- Insurance Exams
- State Government Exams
- MBA Entrance Exams
Quick Examples
Example 1:
How many odd days are there in an ordinary year?
365 ÷ 7 = 52 weeks and 1 day
Odd Days = 1
Example 2:
How many odd days are there in a leap year?
366 ÷ 7 = 52 weeks and 2 days
Odd Days = 2
Example 3:
Find the day on 1 January 2000.
Odd days up to 1999 = 0
Therefore:
1 January 2000 was Saturday
Example 4:
Is 1900 a leap year?
1900 is divisible by 100 but not by 400.
Therefore:
1900 is NOT a leap year.
Example 5:
Find the next same calendar year after 2021.
2021 is an ordinary year.
The next same calendar year is 2027.
Final Takeaway
This Calendar Cheat Sheet provides complete revision material for all major concepts frequently asked in competitive examinations. Regular practice of odd day calculations, leap year concepts, day finding methods, and shortcut techniques can significantly improve speed, accuracy, and logical problem-solving ability.
It is highly useful for quick revision before exams and helps candidates strengthen the foundation of Quantitative Aptitude.
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