# Download Calculate the Day of the Week apk 1.4 free for Android smartphone

25 Dec
Calculate the Day of the Week

Posted by vandestra in Puzzle | Dec. 25, 2013 | 1 Comments

Apk file size: 1.3 MB

A date between January 1st 1900 and December 31st 2099 is displayed. Guess the day of the week.

How to make the calculation ?

Example: 17 / 12 / 1997
1) remember the day of the month (17)
2) remember the "code" for the month (Jan=6;Feb=2;Mar=2;Apr=5;May=0;Jun=3;Jul=5;Aug=1;Sep=4;Oct=6;Nov=2;Dec=4) In this example we remember (4)
3) Remember the year (97 - without the century 19)
4) divide the year 97 by 4 and forget the number after the comma: 97:4=24,25 ==> we remember (24)
5) add 1 for all dates between 1/1/1900 and 31/12/1999
6) check if it was a leap year - if it was a leap year : the code for Jan becomes 5 and for Feb it becomes 1
7) add all remembered number together: 17+4+97+24+1 = 143
8) distract the largest possible multiple of 7 => 143-7*20 = 143-140 = 3
9) 3 stands for wednesday (1 for monday; 2 for tuesday, ...)

Don't give up until you reach an average of 10 seconds - after a while it becomes easy, especially when you learn how to think in a seven numerical system.

vandestra part of our Puzzle and have average installs from 100 to 500. Last Update Dec. 25, 2013. Google play rating is 100.0. Current verison is 1.4. Actual size 1.3 MB.