Discussion

January 1, 2008 is Tuesday. What day of the week lies on Jan 1, 2009?

Answer: C

Only the remainder on division by 7 matters - the odd days.

2008 is divisible by 4 and is not a century year, so it is a leap year with 366 days.

\[ 366 = 52 \times 7 + 2 \quad\Longrightarrow\quad 2 \text{ odd days} \]

\[ \text{Tuesday} + 2 = \textbf{Thursday} \]

An ordinary year advances the date by one weekday; a leap year by two.

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