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Basic FormulasRule 1Rule 2 |
Formula / Rule / Type 2 :-
Direct Formula / Rule 2 : Theorem : To find the day of a week by the help of the number of odd days, when no reference day is given :Working Rule 1. Count the net number of odd days on the given date. 2. In that case we count days according to number of odd days. See the table given below
Note: 1. First January, 1 AD was Monday. Therefore we must count days from Sunday ie Sunday for 0 odd day, Monday for 1 odd day, Tuesday for 2 odd days, and so on. 2. February in an ordinary year gives no odd day, but in a leap year gives one odd day. Suppose someone asks you to find the day of the week on 12th January 1979. 12th Jan, 1979 means 1978 years + 12 days Now, 1600 years have 0 odd day. 300 years have 5 X 3 = 15 ie 1 odd day 78 years have 59 ordinary years + 19 leap years = 59 + 2 x 19 = 97 days = 13 weeks+ 6 days =6 odd days Total number of odd days = 0 + 1 + 6 + 1 2 = 19 or 5 odd days So the day was Friday [See the table] Example :
1 = Thursday |
Basic FormulasRule 1Rule 2 |