October 9, 2012, fell on a Tuesday. On which day of the week did June 25, 2013, fall? (Note: 2012 was a leap year.)  Pick one:
A) Sunday B) Monday C) Tuesday D) Wednesday E) Thursday
The date range contains a partial year. The number of days in the partial year is:   October - 22, February - 28, November and April - 30, December, January, March, and May - 31, and June - 25.   22 + 28 + (2 * 30) + (4 * 31) + 25= 
<gadget id="calculator">22 + 28 + (2 * 30) + (4 * 31) + 25</gadget>
<output>259</output>
259 total days in the date range.   Divide by 7 to determine how much the day of the week advances:   259 / 7= 
<gadget id="calculator">  259 / 7</gadget>
<output>37</output>
37 remainder 0.   Since the remainder is 0 the second date has the same day of the week as the first date.   Even though 2012 is a leap year, with 366 days, the extra day does not come into play unless the date range contains February 29. Since this did not occur, the extra day had no effect on the day of the week.   The answer is Tuesday.
<result>C</result>
October 9, 2012, fell on a Tuesday. On which day of the week did June 25, 2013, fall? (Note: 2012 was a leap year.)