On 15th February, 2006, Wednesday falls. What day of the week was it on 15th February, 2005?

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Tuesday. The known date is 15th February, 2006, a Wednesday. We need the same calendar date exactly one year earlier, in 2005. A gap of exactly one year is normally 1 odd day, but it is 2 odd days if a 29 February falls inside that gap. The year to check for that 29 February here is 2005. 2005 is not a leap year, so no 29 February falls inside the gap. So the shift between the two dates is 1 odd day(s). Going back 1 day(s) from Wednesday gives Tuesday. Check: 15th February, 2005 is indeed a Tuesday.

On 15th February, 2006, Wednesday falls. What day of the week was it on 15th February, 2005?

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