On January 12, 1980, it was Saturday. The day of the week on January 12, 1979 was:
None of these
The year 1979 being an ordinary year, it has 1 odd day.
So, the day on 12th January 1980, is one day beyond the day on 12th January, 1979
But January 12, 1980 being Saturday
January 12, 1979 was Friday.
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