Copy this script and paste to your code to add the Islamic Calendar converter
<HTML>
<HEAD>
<SCRIPT language=JavaScript>
function intPart(floatNum){
if (floatNum< -0.0000001){
return Math.ceil(floatNum-0.0000001)
}
return Math.floor(floatNum+0.0000001)
}
function weekDay(wdn){
if(wdn==0){
return "Monday"
}
if(wdn==1){
return "Tuesday"
}
if(wdn==2){
return "Wednesday"
}
if(wdn==3){
return "Thursday"
}
if(wdn==4){
return "Friday"
}
if(wdn==5){
return "Saturday"
}
if(wdn==6){
return "Sunday"
}
return ""
}
function chrToIsl(arg) {
d=parseInt(arg.CDay.value)
m=parseInt(arg.CMonth.value)
y=parseInt(arg.CYear.value)
if ((y>1582)||((y==1582)&&(m>10))||((y==1582)&&(m==10)&&(d>14)))
{
jd=intPart((1461*(y+4800+intPart((m-14)/12)))/4)+intPart((367*(m-2-12*(intPart((m-14)/12))))/12)-
intPart( (3* (intPart( (y+4900+ intPart( (m-14)/12) )/100) ) ) /4)+d-32075
}
else
{
jd = 367*y-intPart((7*(y+5001+intPart((m-9)/7)))/4)+intPart((275*m)/9)+d+1729777
}
arg.JD.value=jd
arg.wd.value=weekDay(jd%7)
l=jd-1948440+10632
n=intPart((l-1)/10631)
l=l-10631*n+354
j=(intPart((10985-l)/5316))*(intPart((50*l)/17719))+(intPart(l/5670))*(intPart((43*l)/15238))
l=l-(intPart((30-j)/15))*(intPart((17719*j)/50))-(intPart(j/16))*(intPart((15238*j)/43))+29
m=intPart((24*l)/709)
d=l-intPart((709*m)/24)
y=30*n+j-30
arg.HDay.value=d
arg.HMonth.value=m
arg.HYear.value=y
}
function islToChr(arg) {
d=parseInt(arg.HDay.value)
m=parseInt(arg.HMonth.value)
y=parseInt(arg.HYear.value)
jd=intPart((11*y+3)/30)+354*y+30*m-intPart((m-1)/2)+d+1948440-385
arg.JD.value=jd
arg.wd.value=weekDay(jd%7)
if (jd> 2299160 )
{
l=jd+68569
n=intPart((4*l)/146097)
l=l-intPart((146097*n+3)/4)
i=intPart((4000*(l+1))/1461001)
l=l-intPart((1461*i)/4)+31
j=intPart((80*l)/2447)
d=l-intPart((2447*j)/80)
l=intPart(j/11)
m=j+2-12*l
y=100*(n-49)+i+l
}
else
{
j=jd+1402
k=intPart((j-1)/1461)
l=j-1461*k
n=intPart((l-1)/365)-intPart(l/1461)
i=l-365*n+30
j=intPart((80*i)/2447)
d=i-intPart((2447*j)/80)
i=intPart(j/11)
m=j+2-12*i
y=4*k+n+i-4716
}
arg.CDay.value=d
arg.CMonth.value=m
arg.CYear.value=y
}
</SCRIPT>
<head>
<BODY>
<TABLE border=1>
<TBODY>
<TR>
<TH></TH>
<TH>Day</TH>
<TH>Month</TH>
<TH>Year</TH></TR>
<TR>
<TH>Masehi </TH>
<FORM name=Irgendšppis>
<TH><INPUT size=4 value=1 name=CDay></TH>
<TH><INPUT size=4 value=1 name=CMonth></TH>
<TH><INPUT size=4 value=1996 name=CYear></TH></TR>
<TR>
<TH>Hijrah</TH>
<TH><INPUT size=4 name=HDay></TH>
<TH><INPUT size=4 name=HMonth></TH>
<TH><INPUT size=4 name=HYear></TH></TR></TBODY></TABLE>
<P>
<INPUT onclick=chrToIsl(this.form) type=button value="Masehi to Hijrah" name=CtoH>
<INPUT onclick=islToChr(this.form) type=button value="Hijrah to Masehi" name=HtoC>
<P>Day of the week: <INPUT size=10 name=wd>
<P>Julian Day: <INPUT size=7 name=JD>
<P></FORM>
<HR>
<p><font color="#006600" size="1" face="Century Gothic">Julian dates assign a unique number to each
calendar day. The Julian day number counts the number of days since noon
on January 1, -4712 (astronomical calendar) or January 1, 4713 BC (civil
calendar). This system, widely used by astronomers, was proposed by Julius
J. Scaliger in 1583. Hours and minutes are counted as fractions of a day
since the last noon (Universal Time).</font></p>
<TABLE border=1>
<TBODY>
<TR>
<TH>1</TH>
<TH>Muharram</TH>
<TH></TH>
<TH>7</TH>
<TH>Rajab</TH></TR>
<TR>
<TH>2</TH>
<TH>Safar</TH>
<TH></TH>
<TH>8</TH>
<TH>Sha'ban</TH></TR>
<TR>
<TH>3</TH>
<TH>Rabi'ul Awal</TH>
<TH></TH>
<TH>9</TH>
<TH>Ramadhan</TH>
</TR>
<TR>
<TH>4</TH>
<TH>Rabi'ul Akhir</TH>
<TH></TH>
<TH>10</TH>
<TH>Shawwal</TH></TR>
<TR>
<TH>5</TH>
<TH>Jumadil Awal</TH>
<TH></TH>
<TH>11</TH>
<TH>Zulkaedah</TH>
</TR>
<TR>
<TH>6</TH>
<TH>Jumadil Akhir</TH>
<TH></TH>
<TH>12</TH>
<TH>Zulhijjah</TH>
</TR></TBODY></TABLE>
</BODY>
</HTML>
source: over the internet
