Key Calendar Concepts for Exams ๐Ÿ“…

Key Calendar Concepts for Exams ๐Ÿ“…

To excel in calendar reasoning questions for exams like SSC CHSL, focus on these essential concepts:-

Key Calendar Concepts for Exams ๐Ÿ“…
May 17, 2025ยทAryan
Aryan

Key Calendar Concepts for Exams ๐Ÿ“…

To excel in calendar reasoning questions for exams like SSC CHSL, focus on these essential concepts:


1. Days of the Week ๐Ÿ—“๏ธ

  • There are 7 days: Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday.
  • Days repeat every 7 days, forming a cycle1.

2. Months of the Year ๐Ÿ“†

  • 12 months: January to December.
  • Each month has a fixed number of days (28, 29, 30, or 31)1.

3. Ordinary Year vs. Leap Year ๐Ÿ”„

  • Ordinary Year: 365 days (52 weeks + 1 day). That 1 extra day is called an odd day.
  • Leap Year: 366 days (52 weeks + 2 days). That 2 extra days are called odd days.
  • Leap year rule: Divisible by 4, but century years must also be divisible by 400 (e.g., 2000 is leap, 1900 is not)23.

4. Odd Days Concept ๐Ÿค”

  • Odd days are the extra days left after counting complete weeks in a period.
  • Used to calculate the day of the week for any given date23.
  • Example: 365 days รท 7 = 52 weeks + 1 odd day.

5. Day Coding for Fast Calculation ๐Ÿ”ข

DayCode
Sunday0
Monday1
Tuesday2
Wednesday3
Thursday4
Friday5
Saturday6
  • Use these codes to quickly find the day after a certain number of days2.

6. Century Odd Days & Repetition ๐Ÿ”

  • 100 years: 5 odd days
  • 200 years: 3 odd days
  • 300 years: 1 odd day
  • 400 years: 0 odd days (calendar repeats every 400 years)23.

7. Types of Calendar Questions โ“

  • Finding the Day on a Given Date: With or without a reference date32.
  • Matching Calendars: Which year/month will have the same calendar as another2.
  • Counting Odd Days: To determine the weekday for a date3.
  • Leap Year Calculations: Identifying leap years and their effect on the calendar2.

8. Tricks & Shortcuts ๐Ÿช„

  • The same calendar repeats after 6 or 11 years for ordinary years and after 28 years for leap years3.
  • The first day of a century is always Monday, Wednesday, Friday, or Saturday3.
  • Use odd days to quickly find the weekday for any date.

๐Ÿ“ Quick Practice Question

Q: Today is Monday. What day will it be after 61 days? Solution: 61 รท 7 = 8 weeks + 5 odd days. Monday + 5 = Saturday2 ๐Ÿ›๏ธ


Remember:

  • Mastering these concepts with practice will help you solve calendar questions quickly and accurately in exams! ๐Ÿš€4
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