Created
May 19, 2016 06:40
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js function for convert gregorian date to Islamic Hijra date
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//credit : http://stackoverflow.com/questions/5177598/how-to-convert-gregorian-date-to-hijri-date | |
function gmod(n,m){ | |
return ((n%m)+m)%m; | |
} | |
function kuwaiticalendar(adjust){ | |
var today = new Date(); | |
if(adjust) { | |
adjustmili = 1000*60*60*24*adjust; | |
todaymili = today.getTime()+adjustmili; | |
today = new Date(todaymili); | |
} | |
day = today.getDate(); | |
month = today.getMonth(); | |
year = today.getFullYear(); | |
m = month+1; | |
y = year; | |
if(m<3) { | |
y -= 1; | |
m += 12; | |
} | |
a = Math.floor(y/100.); | |
b = 2-a+Math.floor(a/4.); | |
if(y<1583) b = 0; | |
if(y==1582) { | |
if(m>10) b = -10; | |
if(m==10) { | |
b = 0; | |
if(day>4) b = -10; | |
} | |
} | |
jd = Math.floor(365.25*(y+4716))+Math.floor(30.6001*(m+1))+day+b-1524; | |
b = 0; | |
if(jd>2299160){ | |
a = Math.floor((jd-1867216.25)/36524.25); | |
b = 1+a-Math.floor(a/4.); | |
} | |
bb = jd+b+1524; | |
cc = Math.floor((bb-122.1)/365.25); | |
dd = Math.floor(365.25*cc); | |
ee = Math.floor((bb-dd)/30.6001); | |
day =(bb-dd)-Math.floor(30.6001*ee); | |
month = ee-1; | |
if(ee>13) { | |
cc += 1; | |
month = ee-13; | |
} | |
year = cc-4716; | |
wd = gmod(jd+1,7)+1; | |
iyear = 10631./30.; | |
epochastro = 1948084; | |
epochcivil = 1948085; | |
shift1 = 8.01/60.; | |
z = jd-epochastro; | |
cyc = Math.floor(z/10631.); | |
z = z-10631*cyc; | |
j = Math.floor((z-shift1)/iyear); | |
iy = 30*cyc+j; | |
z = z-Math.floor(j*iyear+shift1); | |
im = Math.floor((z+28.5001)/29.5); | |
if(im==13) im = 12; | |
id = z-Math.floor(29.5001*im-29); | |
var myRes = new Array(8); | |
myRes[0] = day; //calculated day (CE) | |
myRes[1] = month-1; //calculated month (CE) | |
myRes[2] = year; //calculated year (CE) | |
myRes[3] = jd-1; //julian day number | |
myRes[4] = wd-1; //weekday number | |
myRes[5] = id; //islamic date | |
myRes[6] = im-1; //islamic month | |
myRes[7] = iy; //islamic year | |
return myRes; | |
} | |
function writeIslamicDate(adjustment) { | |
var wdNames = new Array("Ahad","Ithnin","Thulatha","Arbaa","Khams","Jumuah","Sabt"); | |
var iMonthNames = new Array("Muharram","Safar","Rabi'ul Awwal","Rabi'ul Akhir", | |
"Jumadal Ula","Jumadal Akhira","Rajab","Sha'ban", | |
"Ramadan","Shawwal","Dhul Qa'ada","Dhul Hijja"); | |
var iDate = kuwaiticalendar(adjustment); | |
var outputIslamicDate = wdNames[iDate[4]] + ", " | |
+ iDate[5] + " " + iMonthNames[iDate[6]] + " " + iDate[7] + " AH"; | |
return outputIslamicDate; | |
} | |
var div = document.getElementById('dates'); | |
div.innerHTML = div.innerHTML + writeIslamicDate(); |
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