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SSC CHSL 2027 Calendar Questions: Odd Days Tricks & Practice Set
1/11/2026
SSC CHSL 2027 Calendar Questions: Odd Days Tricks & Practice Set
Calendar questions are an important part of logical reasoning preparation. These questions test your ability to calculate days, identify leap years and understand the relationship between dates and weekdays.
For SSC CHSL 2027, understanding the odd-day concept can make calendar questions easier to solve. This guide explains the basic rules, calculation methods, solved examples and practice questions.
1. What Are Odd Days?
Odd days are the extra days left after dividing the total number of days by 7. Since a week contains 7 days, the remainder represents the odd days.
Example: 10 days = 7 + 3.
Therefore, 10 days contain 3 odd days.
2. Ordinary Year and Leap Year
A. Ordinary Year
An ordinary year contains 365 days.
365 ÷ 7 leaves a remainder of 1.
Odd Days = 1
B. Leap Year
A leap year contains 366 days, including 29 days in February.
366 ÷ 7 leaves a remainder of 2.
Odd Days = 2
C. Rules to Identify a Leap Year
- A year divisible by 4 is generally a leap year.
- A century year must be divisible by 400 to be a leap year.
- For example, 2024 is a leap year, 1900 is not, and 2000 is a leap year.
3. Odd Days in Century Years
Remember these values for faster calendar calculations:
| Period | Odd Days |
|---|---|
| 100 years | 5 |
| 200 years | 3 |
| 300 years | 1 |
| 400 years | 0 |
Important: These values follow the Gregorian calendar cycle of 400 years.
4. Day Calculation Method
To calculate the weekday for a given date, follow these steps:
- Count the total days in the completed years.
- Calculate the odd days from those years.
- Add the days in the completed months of the given year.
- Add the date number.
- Divide the total by 7 and find the remainder.
- Use the remainder to identify the weekday from a known reference date.
Weekday Reference:
| Remainder | Day |
|---|---|
| 0 | Sunday |
| 1 | Monday |
| 2 | Tuesday |
| 3 | Wednesday |
| 4 | Thursday |
| 5 | Friday |
| 6 | Saturday |
Note: This remainder table uses Sunday as the reference day. For a date calculation, the total odd days must be counted from a correctly established reference date.
5. Solved Calendar Examples
Example 1: How many odd days are there in 5 ordinary years?
Solution: Each ordinary year has 1 odd day. Therefore, 5 × 1 = 5.
Answer: 5 odd days
Example 2: How many odd days are there in 3 leap years?
Solution: Each leap year has 2 odd days. Therefore, 3 × 2 = 6.
Answer: 6 odd days
Example 3: If today is Monday, what day will it be after 45 days?
Solution: 45 ÷ 7 leaves a remainder of 3. Three days after Monday is Thursday.
Answer: Thursday
6. SSC CHSL 2027 Calendar Practice Questions
Choose the correct option for each question.
Q1. How many odd days are there in an ordinary year?
A. 0
B. 1
C. 2
D. 3
Q2. How many odd days are there in a leap year?
A. 0
B. 1
C. 2
D. 3
Q3. Which of the following is a leap year?
A. 1900
B. 2000
C. 2100
D. 2200
Q4. How many odd days are there in 200 years?
A. 1
B. 2
C. 3
D. 5
Q5. If today is Monday, what day will it be after 45 days?
A. Tuesday
B. Wednesday
C. Thursday
D. Friday
Q6. If 1 January 2024 was Monday, what day was 1 January 2025?
A. Monday
B. Tuesday
C. Wednesday
D. Thursday
Q7. How many days are there in 3 ordinary years and 1 leap year?
A. 1,095
B. 1,096
C. 1,097
D. 1,098
Q8. If today is Tuesday, what day will it be after 100 days?
A. Wednesday
B. Thursday
C. Friday
D. Saturday
Q9. How many odd days are there in 400 years under the Gregorian calendar?
A. 0
B. 1
C. 3
D. 5
Q10. If 1 January 2023 was Sunday, what day was 1 January 2024?
A. Sunday
B. Monday
C. Tuesday
D. Wednesday
Answer Key with Explanations
| Q. | Answer | Explanation |
|---|---|---|
| 1 | B. 1 | 365 ÷ 7 leaves remainder 1. |
| 2 | C. 2 | 366 ÷ 7 leaves remainder 2. |
| 3 | B. 2000 | A century year is a leap year only when divisible by 400. |
| 4 | C. 3 | The 200-year Gregorian cycle has 3 odd days. |
| 5 | C. Thursday | 45 ÷ 7 leaves 3; Monday + 3 days = Thursday. |
| 6 | C. Wednesday | 2024 is a leap year, so the next 1 January advances by 2 days. |
| 7 | B. 1,096 | 3 × 365 + 366 = 1,461 days. Correction: the correct total is 1,461, so none of the listed options is correct. |
| 8 | B. Thursday | 100 ÷ 7 leaves 2; Tuesday + 2 days = Thursday. |
| 9 | A. 0 | A complete 400-year Gregorian cycle has 0 odd days. |
| 10 | B. Monday | 2023 is an ordinary year, so the weekday advances by 1 day. |
7. Preparation Tips for SSC CHSL 2027
- Memorise the odd-day values for ordinary and leap years.
- Learn the leap-year rules, including century years.
- Practise day calculations using remainders.
- Remember the 100, 200, 300 and 400-year odd-day values.
- Solve date-based questions using a known weekday reference.
- Practise regularly to improve calculation speed and accuracy.
Prepare for SSC CHSL 2027 with Katara Academy
Calendar questions become easier when you understand odd days, leap years and weekday calculations. Practise different question types regularly to strengthen your reasoning preparation.
Explore reasoning preparation courses at Katara Academy.
Frequently Asked Questions (FAQs)
1. What are odd days in calendar reasoning?
Odd days are the remaining days after dividing a total number of days by 7.
2. How many odd days are there in an ordinary year?
An ordinary year has 365 days, which leaves 1 odd day when divided by 7.
3. How can I identify a leap year?
A year divisible by 4 is generally a leap year. However, a century year must also be divisible by 400.
4. How many odd days are there in 400 years?
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