Explanation: January 12, 1979 = 1979 years + 12 days 1600 years : 0 odd days 300 years : 1 odd day 78 years have 19 leap years + 59 ordinary years i.e. 38 + 59 i.e. 97 i.e. 6 odd days 12 days of January have 5 odd days Total number of odd days = 0 + 1+ 6+5 = 12 i.e. 5 odd days ∴ the day on January 12 , 1979 was a Friday
