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QWhat was the day of the week on Valentines day of 2000?
ID: #6205
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#6205Q ID
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Output: 14th February, 2000 = ( 1999 years + January 1st, 2000 to 14th Feb, 2000)
Counting odd days:
1600 years = 0 odd day. 300 years = 1 odd day.
99 years = (24 leap years + 75 ordinary years)
[(24×2) + (75×1)] odd days = 123 odd days => 17 weeks + 4 days = 4 odd days.
1999 = (0 + 1 + 4) odd days => 5 odd days.
Jan(31) + Feb(14) = 45 days = (6 weeks + 3 day) => 3 odd day.
Total number of odd days: 5+3 => 8 days which in turns 1 odd day.
The answer is Monday.
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