<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()+' Pâques 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>Pâques / 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>
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