Discussion
On 8th Dec, 2007 Saturday falls. What day of the week was it on 8th Dec, 2006 ?
Answer: D
Going back one year shifts the day by the number of odd days in the year crossed.
The span from 8 December 2006 to 8 December 2007 lies wholly inside ordinary territory - 2008 is the leap year, and its 29 February is not in this range - so the span is 365 days:
\[ 365 \equiv 1 \pmod 7 \]
The later date is therefore one day further on, so the earlier one is one day back:
\[ \text{Saturday} - 1 = \textbf{Friday} \]
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