Icontem

File: getEaster.html

Recommend this page to a friend!
  Classes of Pierre FAUQUE  >  JavaScript Holiday Dates  >  getEaster.html  >  Download  
File: getEaster.html
Role: Example script
Content type: text/plain
Description: Example of use (getEaster)
Class: JavaScript Holiday Dates
Calculator for the dates of different holidays
Author: By
Last change:
Date: 4 years ago
Size: 2,545 bytes
 

Contents

Class file image Download
<html>

<head>
<title>DateObj.getEaster()</title>

<script language="javascript" type="text/javascript">
// For French users : getPaques()
Date.prototype.getPaques=function(){var Y,y,a,b,c,D,d,e,f,g,M,m,p;Y=''+this.getFullYear();y=Y.substr(2,2);a=Y%19;b=Y%4;c=Y%7;e=((19*a)+24)%30;f=((2*b)+(4*c)+(6*e)+5)%7;g=(22+e+f);p=new Date(Y,2,g,0,0,0);d=p.getDate();D=(d<10)?'0'+d:d;m=p.getMonth()+1;M=(m<10)?'0'+m:m;return D+'/'+M+'/'+Y;};

// For English users: getEaster()
Date.prototype.getEaster=function(){var Y,y,a,b,c,D,d,e,f,g,M,m,p;Y=''+this.getFullYear();y=Y.substr(2,2);a=Y%19;b=Y%4;c=Y%7;e=((19*a)+24)%30;f=((2*b)+(4*c)+(6*e)+5)%7;g=(22+e+f);p=new Date(Y,2,g,0,0,0);d=p.getDate();D=(d<10)?'0'+d:d;m=p.getMonth()+1;M=(m<10)?'0'+m:m;return M+'/'+D+'/'+Y;};
</script>

<script language="javascript" type="text/javascript">

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Test the validity of a French date (DD/MM/YYYY).
// Return "OK" or an error message
// You can interchange the lines A and B (with indices correction) for a format such as MM/DD/YYYY
function isValidDate(date) {
	var date, tab, reg = new RegExp("^[0-9]{2}[/]{1}[0-9]{2}[/]{1}[0-9]{4}$","g");
	if(reg.test(date)) {
		tab=date.split('/');
		if((tab[0]*1)<1 || (tab[0]*1)>31) { return "Incorrect day"; }   // A
		if((tab[1]*1)<1 || (tab[1]*1)>12) { return "Incorrect month"; } // B
		return "OK";
	}
	return "Incorrect format date";
}

function showEaster() {

	var date, tab, j, m, a, thedate, msg;

	date = document.test.date.value;

	tab = date.split('/');
	j=tab[0]*1; m=tab[1]-1; a=tab[2]*1;
	thedate = new Date(a, m, j);

	msg  = 'En '+thedate.getFullYear()+' P‚ques tombe le '+thedate.getPaques();
	msg += '\n'
	msg += 'In '+thedate.getFullYear()+' Easter arrives on '+thedate.getEaster();
	alert(msg);
}

function verif() {

	var thedate, msg;

	// get the values of the form
	thedate = document.test.date.value;

	if(!thedate) {
		alert('Date is missing');
		document.test.date.focus();
		return false;
	}

	msg = isValidDate(thedate);
	if(msg != "OK") {
		alert("Date :\n"+msg);
		document.test.date.focus();
		return false;
	}

	return true;
}
</script>
</head>

<body>
<h3>P&acirc;ques / Easter</h3>
<form name="test" method="post" action="javascript:showEaster()" onsubmit="return verif()">
Write a date (DD/MM/YYYY) <input type="text" name="date" size="10"><input type="submit" name="submit" value="Validate">
</form>

</body>

</html>