If 19th November 2003 is a Wednesday, then what day of the week will 25th March 2011 be?

We find the total number of days between the two dates and take mod 7.

From 19 Nov 2003 (Wednesday) to 19 Nov 2010 = 7 years.

Leap years in this period: 2004, 2008 → 2 leap years

Total days:
$7 \times 365 + 2 = 2555 + 2 = 2557$

$2557 \mod 7 = 2555 \mod 7 + 2 \mod 7 = 0 + 2 = 2$

So, 19 Nov 2010 is Wednesday + 2 days = Friday

Now from 19 Nov 2010 to 25 March 2011:

Break it:

• Nov 19 → Nov 30 = 11 days
• Dec = 31
• Jan = 31
• Feb 2011 = 28
• Mar 1 → Mar 25 = 25

Total = $11 + 31 + 31 + 28 + 25 = 126$

$126 \mod 7 = 0$, so no change in weekday.

So 25 March 2011 is also Friday.

Correct answer: Friday (शुक्रवार)