Question

If 1st January 2023 was a Sunday, what day was 1st January 2024?

• A. Monday
• B. Tuesday
• C. Sunday
• D. Saturday

Hint:

Non-leap year = +1 day; Leap year = +2 days for the same date.

Answer 1

The Correct Option is A

Step 1: Understand the Concept
This problem is solved using the "Odd Days" concept in calendars. An ordinary year has 365 days. When divided by 7 (the number of days in a week), we get 52 weeks and a remainder of 1 day ($365 = 52 \times 7 + 1$). This remaining day is called an "odd day." In a non-leap year, any given date shifts forward by exactly one day in the following year.

Step 2: Analysis of the Given Year
We are looking at the transition from 1st January 2023 to 1st January 2024. First, we check if 2023 is a leap year. Since 2023 is not divisible by 4, it is a non-leap (ordinary) year consisting of 365 days.
Analysis: 365 days = 52 weeks + 1 odd day.
Since we are starting on 1st January 2023 and ending on 1st January 2024, we have completed one full ordinary year, which results in 1 odd day.

Step 3: Conclusion
Because there is 1 odd day, the day of the week for the same date in the next year will be one day ahead of the current day. If 1st January 2023 was a Sunday, then 1st January 2024 will be Sunday + 1 day = Monday.

Final Answer: (A)