Anno:
Data Pasqua:

<form name="pasquaform"> <font size="-1"> <h2 align="center"> <span style="font-weight: 400; background-color:#FFFFFF"> <font face="Adventurer Light SF" color="#800000">Data della Pasqua</font></span><font face="Verdana"><br> <font size="2">Inserire l'anno di riferimento</font></font></h2> <p align="center"> <table width="337"> <tr> <td align="center"> <p align="center"><font face="Verdana" size="2">Anno: </font> <font color="#800000" size="1" face="Verdana"> <input size=4 maxlength=4 name="Jahr" onChange="Festivo()" style="background-color: #C0C0C0"></font></td> <td align=center> <p align="center"><input type=button value="Calcola" onClick="Festivo()"></td> </tr> <tr> <td colspan=2 height="27"> <p align="center"><font size="2" face="Verdana">Data Pasqua: </font> <font color="#800000" face="Verdana"> <input size=20 name="Ausgabe" style="background-color: #C0C0C0"></font></td> </tr> </table> </font> </form>

<script> function Pasqua(datum) { var a,b,c,d,e,f,g,h,i,k,l,m,n,p; a=datum.j%19; b=Math.floor(datum.j/100); c=datum.j%100; d=Math.floor(b/4); e=b%4; f=Math.floor((b+8)/25); g=Math.floor((b-f+1)/3); h=(19*a+b-d-g+15)%30; i=Math.floor(c/4); k=c%4; l=(32+2*e+2*i-h-k)%7; m=Math.floor((a+11*h+22*l)/451); n=Math.floor((h+l-7*m+114)/31); p=(h+l-7*m+114)%31; datum.m=n; datum.t=p+1; } function datum(t,m,j) { this.t=t; this.m=m; this.j=j; } function Festivo() { var Datum=new datum; Datum.j=parseFloat(document.pasquaform.Jahr.value); Pasqua(Datum); document.pasquaform.Ausgabe.value=Datum.t+". "+Datum.m+". "+Datum.j; } </script>