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Extending the Date Object to Include Some New Methods


/*
JavaScript Unleashed, Third Edition
by Richard Wagner and R. Allen Wyke 

ISBN: 067231763X
Publisher Sams CopyRight 2000

*/

<script type="text/javascript" language="JavaScript1.1">
<!--
  Date.prototype.getActualMonth = getActualMonth;
  Date.prototype.getActualDay = getActualDay;
  Date.prototype.getCalendarDay = getCalendarDay;
  Date.prototype.getCalendarMonth = getCalendarMonth;
     function getActualMonth() {
    var n = this.getMonth();
    n += 1;
    return n;
  }
  function getActualDay() {
    var n = this.getDay();
    n += 1;
    return n;
  }
  function getCalendarDay() {
    var n = this.getDay();
    var dow = new Array(7);
    dow[0"Sunday";
    dow[1"Monday";
    dow[2"Tuesday";
    dow[3"Wednesday";
    dow[4"Thursday";
    dow[5"Friday";
    dow[6"Saturday";
    return dow[n];
  }
  function getCalendarMonth() {
    var n = this.getMonth();
    var moy = new Array(12);
    moy[0"January";
    moy[1"February";
    moy[2"March";
    moy[3"April";
    moy[4"May";
    moy[5"June";
    moy[6"July";
    moy[7"August";
    moy[8"September";
    moy[9"October";
    moy[10"November";
    moy[11"December";
    return moy[n];
  }
     // Test the new methods you created
  var today = new Date();
  document.write("<b>I hereby declare that on "
    + today.getCalendarDay() ", the " + today.getDate()
    "th day of " + today.getCalendarMonth() " in the year "
    + today.getFullYear() " A.D. at the " + today.getHours()
    "th hour of the day, absolutely nothing is happening.</b>");
//-->
</script>
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11.  Date: Week of the year
12.  Display current date: year, month day in number
13.  Methods and Properties of the Date Object
14.  Using the Date Object
15.  Output day
16.  A Dynamic Welcome Message
17.  How Many Days Until Christmas
18.  Summer Games Countdown
19.  Simple Date Validation
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