On 18th September, 1987, Friday falls. What day of the week was it on 18th September, 1986?

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Thursday. The known date is 18th September, 1987, a Friday. We need the same calendar date exactly one year earlier, in 1986. 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 1987. 1987 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 Friday gives Thursday. Check: 18th September, 1986 is indeed a Thursday.

On 18th September, 1987, Friday falls. What day of the week was it on 18th September, 1986?

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