On Saturday, 14 February 2009 it was Valentine’s Day. What weekday was 14 February 2008?

Introduction / Context:We relate the same month–day across consecutive years while accounting for leap years.

Given Data / Assumptions:

• 14 Feb 2009 = Saturday.
• 2008 is a leap year.

Concept / Approach:From a leap year date to the same date next year, the weekday advances by 2 days. Conversely, going backward from a non-leap year date to the same date in the leap year, the weekday moves back 2 days.

Step-by-Step Solution:Known: 14 Feb 2009 is Saturday.Going back to 14 Feb 2008 (leap year) shifts by −2 days.Saturday − 1 = Friday, − 1 = Thursday.

Verification / Alternative check:Count the total days between the two dates or apply standard day-of-week congruences; both confirm Thursday for 14 Feb 2008.

Why Other Options Are Wrong:Tuesday/Sunday are off by multiple days; “None of these” is unnecessary since Thursday fits.

Common Pitfalls:Forgetting that 2008 is leap, which changes the 1-day step to a 2-day step for dates on/after Feb 29 considerations.

Final Answer:Thursday