<html>
<script language="javascript">
var año;
var mes;
var dia;
var x;
dia=prompt("digite el dia"," ");
mes=prompt("digite el mes"," ");
año=prompt("digite el año"," ");
if((año%4)==0)
{
var x==1;
}
if (año<=1960)
{
alert ("no admitido");
}
else
{
if ((mes==1)&&(mes==3)&&(mes==5)&&(mes==7)&&(mes==8)&&(mes==10))
{
if (dia=!31)
{
dia=dia+1;
}
if (dia==31)
{
dia=1;
mes=mes+1
}
}
if((mes==4)&&((mes==6)&&((mes==9)&&((mes==11))
{
if (dia=!30)
{
dia=dia+1;
}
if (dia==30)
{
dia=1;
mes=mes+1;
}
}
if (mes==2)
{
if (x==1)
{
if (dia=!29)
{
dia=dia+1;
}
if (dia==29)
{
dia=1;
mes=mes+1;
}
}
else
{
if (dia=!28)
{
dia=dia+1;
}
if (dia==28)
{
dia=1;
mes=mes+1
}
}
}
if ((mes==12)&&(dia=31))
{
dia=1;
año=año+1;
mes=1;
}
if ((mes==12)&& (dia=!31))
{
dia=dia+1;
}
}
alert ("el año es "+año);
alert ("el mes es "+mes);
alert ("el dia es "+dia);
</script>
</html>
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