Some of us learnt growing up in India how to calculate day for a given date but do remember that formula was for the last century!
Can you believe almost all of my friends were born in last century. Really old fellas (is it fellis for women? Why do women sometimes say lets go guys to other woman.. ok. that is another different post!)
Secrets of Mental Math by Arthur Benjamin and Michael Shermer contains the formula which I will elaborate here.
I will work this for Jan 1 2014 .
Now to Jan 1 2014.
Create Y2k again and remove 20.
You have 14
Get 25% of 14 (think of it as a tip and asking the waiter to keep the change - simple way to say go for the quotient and forget the reminder - have you ever forgot your reminder??? - ok..will write about this separate )
Answer = 3
Now Add 14 and 3. Year and 25% of Year
Gives you 17
Find closest multiple of 7 less than 17
Answer = 14
Subtract 17-14= 3 (Didn't we start with 3..observe the steps and it is coincidental and will change for our christmas problem)
Now use the following
Monday 1
Tuesday 2
Wednesday 3
Thursday 4
Friday 5
Saturday 6
Sunday 7 (or 0)
In future posts I will explain how to calculate days for other days including your birthday, your wife's birthday (if married and remember you should never forget that date.
The secret to remembering your wife's birthday is to forget it once.
She will help(!) you big time and ensure you remember every time including her mom's birthday) and any other day in the future.
Do we have another round of Mayan calendar or any other calendar expiring like 12/12/12...Check Aztecs Calendar and make sure the if there is a prediction of end of world in their calendar.
Now try Jan 1 2030 you should get Tuesday.
Remember the formula will not work for Leap Year. For leap year you need to substract one more..think.. and try solving 2020.
Happy Learning
Sivakumar Manikanteswaran
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