Question

If January 1, 2023, is a Sunday, what day of the week will March 1, 2023, be?

• A. Monday
• B. Tuesday
• C. Wednesday
• D. Thursday

Hint:

When moving across months, add each month’s length modulo \(7\). In non-leap years, February contributes \(0\) to the weekday shift.

Answer 1

The Correct Option is C

Step 1 (Count days month by month).
From Jan 1 to Feb 1: January has \(31\) days shift \(=31 \equiv 3 \ (\bmod 7)\).
From Feb 1 to Mar 1: 2023 is not a leap year, so February has \(28\) days shift \(=28 \equiv 0 \ (\bmod 7)\).
Step 2 (Apply day shifts).
Starting day = Sunday.
After January shift: Sunday \(+\ 3\) days \(=\) Wednesday.
After February shift: no change (28 is a full number of weeks).
Step 3 (Conclusion).
Therefore, March 1, 2023 falls on Wednesday.
\[ {\text{Wednesday (Option (c)}} \]