Given: 1st January 2003 is Monday. 2003 is not a leap year. ∴ Total No. of days = 365 No. of days from 2nd January to 31st December =365−1=364=(7×52) days ∴ No. of odd days = 0 ∴ 31st December and 1st January 2003 will fall on the same day of the week i.e., Monday.