5 Fridays, 5 Saturdays & 5 Sundays in a month as common as your birthday!

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July 2011 has 5 Fridays, 5 Saturdays and 5 Sundays.

So let me jump on the table and dance on one leg with joy!

Why?

Because I am told by many people that for some obscure reason, this wonderful event happens only once in 823 years!

To burst the bubble right away, March 2013 also has 5 Fridays, 5 Saturdays and 5 Sundays!

Don’t believe me? Just click the time/calendar on the right hand bottom of your computer screen and check out March 2013.

Also, 5 Fri-Sat-Sundays would have hit you roughly that many times as many birthdays you have celebrated on this planet.

Don’t believe me again?

The Maths…

Every year has 7 months that have 3 days which come 5 times in that particular month.

(If a month has 31 days, then every day is repeated 4 times by the 28th of the month.

So 29th, 30th and 31st are extra or “5th” days.

Seven months have 31 days: January, March, May, July, August, October & December)

The chance that those 3 days are Friday, Saturday and Sunday is exactly 1/7th of that, which works out to be once a year!

(If you pick 3 days randomly from 7 days a week, then there are many permutations and combinations.

However, since the days only come in sequence, there are only 7 possible combinations: Sun-Mon-Tue, Mon-Tue-Wed, Tue-Wed-Thu, Wed-Thu-Fri, Thu-Fri-Sat, Fri-Sat-Sun & Sat-Sun-Mon)

Now this event may be skipped in some year and may happen twice in another since 364 days form 52 weeks and the extra 1-2 days shift the day-date matchings randomly.

Also, in 823 years, 3 days coming 5 times in a month will happen a whopping 5761 times!

A simple thumb rule to check on the calendar…

Any 31-day month on which Friday falls on the 29th will have 5 Fridays, 5 Saturdays and 5 Sundays.

Now the person who started this might argue that what he meant to say was that July being such a month will happen once in 823 years!

To answer that, in July 2016, the phenomenon will be repeated.

And you thought that you could say TGIF followed by a same-month weekend five times in a month only once every 823 years!

Call it a “5TGIF-Weekend Month” (5TWM or Fitwem) and it comes regularly 0, 1 or 2 times a year depending on the year.

But anyway, Internet virals ki Jai Ho!!!

Any Falsehood repeated 10 million times by a million people over thousands of networking and email service sites just has to be True!

This (Correct or Incorrect) Calculation by Sunil Rajguru

2 thoughts on “5 Fridays, 5 Saturdays & 5 Sundays in a month as common as your birthday!

  1. Also, in 823 years, 3 days coming 5 times in a month will happen a whopping 5761 times!
    OKK BUT EXACTLY IN HOW MANY YEARS THIS WILL BE REPEATED ,PLS HELP

  2. 5 saturdays 5 Sundays and 5 Mondays as we have in this july , happens every 823 yrs. What is this phenomena called in Hindu astronomy?

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