Day of Week

Alexei Kourbatov Dec 10, 2008

General

Use this script to calculate what day of the week a given date occurred. Can be used for past or future dates.

Notes

Created by: Alexei Kourbatov
Web Site: Linuxtopia
Posted: December 10, 2008

Source Code

Paste this source code into the designated areas.

External file

Paste this code into an external JavaScript file named: dayOfWeek.js

/* This script and many more are available free online at
The JavaScript Source!! http://www.javascriptsource.com
Created by: Alexei Kourbatov | http://www.linuxtopia.org/online_books/javascript_guides/javascript_faq/index.htm */

function inDate() {
  s=prompt("Input date (example: 1 Jan 2008)","");
  if (s!="" && s!=null) determineDay(s);
}

function determineDay(parStr) {
  while (parStr.charAt(parStr.length-1)==" ") parStr=parStr.substring(0,parStr.length-1);
  while (parStr.charAt(0)==" ") parStr=parStr.substring(1,parStr.length);

  dd=parseInt(parStr,10);
  yyyy=parseInt(parStr.substring(parStr.lastIndexOf(" ")+1,parStr.length))
  mm=-1;
  if (parStr.toUpperCase().indexOf("JAN")!=-1) mm=0;
  if (parStr.toUpperCase().indexOf("FEB")!=-1) mm=1;
  if (parStr.toUpperCase().indexOf("MAR")!=-1) mm=2;
  if (parStr.toUpperCase().indexOf("APR")!=-1) mm=3;
  if (parStr.toUpperCase().indexOf("MAY")!=-1) mm=4;
  if (parStr.toUpperCase().indexOf("JUN")!=-1) mm=5;
  if (parStr.toUpperCase().indexOf("JUL")!=-1) mm=6;
  if (parStr.toUpperCase().indexOf("AUG")!=-1) mm=7;
  if (parStr.toUpperCase().indexOf("SEP")!=-1) mm=8;
  if (parStr.toUpperCase().indexOf("OCT")!=-1) mm=9;
  if (parStr.toUpperCase().indexOf("NOV")!=-1) mm=10;
  if (parStr.toUpperCase().indexOf("DEC")!=-1) mm=11;

  d=new Date();
  d.setDate(1);

  d.setYear(yyyy);
  d.setMonth(mm);
  d.setDate(dd);

  d.setHours(12);

  ww=d.getDay();
  if (ww==0) wDay="Sunday";
  if (ww==1) wDay="Monday";
  if (ww==2) wDay="Tuesday";
  if (ww==3) wDay="Wednesday";
  if (ww==4) wDay="Thursday";
  if (ww==5) wDay="Friday";
  if (ww==6) wDay="Saturday";

  alert (dd+"."+(mm+1)+"."+yyyy+" is "+wDay);
}

Head

Paste this code into the HEAD section of your HTML document.


<script type="text/javascript" src="dayOfWeek.js"></script>

Body

Paste this code into the BODY section of your HTML document


<form name="f1">
  <input value="Weekdays Finder" onclick="inDate()" type="button">
</form>

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