Zeller's Rule : Find the Day of any given Date within Seconds

Zeller's Rule : As the name suggests, this technique has been named after its founder Zeller. This is probably the best method for solving "Dates and Calendar" problems. Using this rule, you can find the day of any particular date within second. You can Participate in various quizzes of our Mission SSC CGL 2016 series for doing better in actual exam.

 Zeller’s Rule Formula: F = K + [(13xM - 1)/5] + D + [D/4] + [C/4] – 2C Here, K = Date => for 25/3/2009, we take 25In Zeller’s rule months start from march.M = Month no. => Starts from March.March = 1, April = 2, May = 3Nov. = 9, Dec = 10, Jan = 11Feb. = 12D = Last two digits of the year, using previous year for January and February. Thus for 2009 = 09C = The first two digits of century => for 2009 = 20 Note - During calculation, consider the integral value only and ignore the value after decimal. See example:

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Example – What was  the day on 25/03/2009?
Sol - F = 25 + [{(13 x1)- 1}/5] + 09 + 09/4 + 20/4 – (2 x 20)
= 25 + 12/5 + 09 + 09/4 + 20/4  - 2×20
=25+2+09+2+5-40
[ We will just consider the integral value and ignore the value after decimal]
= 43 – 40 =
 Replace the number with the day using the information given below.1 = Monday2 = Tuesday3 = Wednesday4 = Thursday5 = Friday6 = Saturday7 or 0 = Sunday

So it’s Wednesday on 25th march, 2009.
If the number is more than 7, divide the no. by 7. The remainder will give you the day.

Questions for Practice
Q1.What was the day on 31st Oct 1984?
(a)Friday              (b)Sunday
(c)Wednesday     (d)Monday

Q2.What was the day on 27th Dec 1985?

(a)Friday                   (b)Monday
(c)Tuesday                (d)Sunday