Answer
Friday. 1988 was a leap year, and had 366 days in it. 366 modulo 7 is 2,
hence there is a two-day discrepancy in same-name dates between 1988 and
1989 if the date is before 29 February. There is a one-day descrepancy if
the date is after 29 February. There was no 29 February 1989, so the
question makes no sense in that case.
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