What day of the week was 17 September, 2012?
Show answer & explanation
Correct answer: D
Explanation
To find the day for 17 September 2012, we can calculate the total number of "odd days" (days beyond full weeks) from a reference point.
Years until 2000: In 2000 years, there are 0 odd days.
Years from 2001 to 2011:
Total years = 11
Leap years (2004, 2008) = 2
Ordinary years = 9
Odd days = (2×2) + (9+1) = 4+9=13days
Months in 2012 (up to September 17):
Jan (31), Feb (29 - Leap Year), Mar (31), Apr (30), May (31), Jun (30), Jul (31), Aug (31), Sept (17).
Total days = 13(from years) + 261(from months) = 274 days.
Total Odd Days:
Total = 274/7
= 39 weeks and 1 remainder
A remainder of 1 corresponds to Monday (0 = Sunday, 1 = Monday, 2 = Tuesday, etc.).
Therefore, 17 September, 2012 is Monday.
Hence, the correct answer is option (4).