Friday, 16 November 2012

Day finder - mind magic

Formula:
    Total = century value + yy + (yy/4) + month table value + date


    x =
Total mod 7 (it means reminder)

Century calculation:
if year between 1900 to 1999 then century value = 0
if year between 2000 to 2099 then century
value = 6


How to do:
Ask your friend birthday ex: 23/Nov/1991
Total = 0+91+(91/4)+3+23 = 139
x = 139 mod 7 = 6
 

if x = 0 then Sunday
if x = 1 then Monday
if x = 2 then Tuesday
if x = 3 then Wednesday
if x = 4 then Thursday
if x = 5 then Friday
if x = 6 then Saturday

So it is Saturday.

If you practice, then it will be easy to calculate and tell the correct day.
You can make a magic.

2 comments:

Anonymous said...

Hello Sir, This logic looks good. But I found it results wrong for some days in the calendar year. For Ex: Try for [Feb 25 1956].
Using the formula [0+56+(56/4)+3+25] equals 98 mod 7 = 0, You will find the mod value (x) will be 0 which implies "Sunday". But the Actual day per calendar shows "Saturday". Hence this logic is wrong.

Note: Check if the Month table value for February is 3. Please reply with your comments. Thank you.

Muthu Raman said...

Dear Visitor,
Thanks for your comment...
But, You didnt see the Leap year rule. 1956 is Leap year, So your formula will be like [0+56+(56/4)+2+25] equals 97 mod 7 = 6.
6 means it is Saturday.

Please see the "Note:" below Month table.