it is a ruby converter from Gregorian to Hijure date format , Hijure date in the formal date in many Arabic and Islamic countries

fromG2H.rb

# you can change the variable given_date to the date you want to be converted or run it directory form terminal like so
#ruby filename.rb year month day
#duby filename.rb 2000 1 1



require "date"

arabic_months = {
	1  => "Muharam",
	2  => "Safer",
	3  => "Rabeea awal",
	4  => "Rabeea akher",
	5  => "Gamada awal",
	6  => "Gamada akher",
	7  => "Ragb",
	8  => "Shaaban",
	9  => "Ramadan",
	10 => "Shawal",
	11 => "zo elqaada",
	12 => "zo Elhagea"
}

def intpart(fnum)
	if fnum < -0.0000001
		return (fnum - 0.0000001).ceil
	else
    	return (fnum + 0.0000001).floor
	end
end
def formg2h(date)
	day 	= date.day
	month 	= date.month
	year 	= date.year
	if ((year > 1582) or ((year == 1582) and (month > 10)) or  ((year == 1582) and (month == 10) and (day > 14)))
       jd1 = intpart((1461 * (year + 4800 + intpart((month - 14) / 12.0))) / 4)
       jd2 = intpart((367 * (month - 2 - 12 * (intpart((month - 14) / 12.0)))) / 12)
       jd3 = intpart((3 * (intpart((year + 4900 + intpart((month - 14) / 12.0)) / 100))) / 4)
       jd = jd1 + jd2 - jd3 + day - 32075
    else
       jd1 = intpart((7 * (year + 5001 + intpart((month - 9) / 7.0))) / 4)
       jd2 = intpart((275 * month) / 9.0)
       jd = 367 * year - jd1 + jd2 + day + 1729777
   end
    l = jd - 1948440 + 10632
    n = intpart((l - 1) /10631.0)
    l = l - 10631 * n + 354
    j1 = (intpart((10985 - l) / 5316.0)) * (intpart((50 * l) / 17719.0))
    j2 = (intpart(l / 5670.0)) * (intpart((43 * l) / 15238.0))
    j = j1 + j2
    l1 = (intpart((30 - j) / 15.0)) * (intpart((17719 * j) / 50.0))
    l2 = (intpart(j / 16.0)) * (intpart((15238 * j) / 43.0))
    l = l - l1 - l2 + 29
    m = intpart((24 * l) / 709.0)
    d = l - intpart((709 * m) / 24.0) +1 #modifies
    y = 30 * n + j - 30


    return Date.new(y, m,d)
end

given_date = Date.new(ARGV[0].to_i,ARGV[1].to_i,ARGV[2].to_i)

date = formg2h(given_date)

p date.day
p arabic_months[date.month]
p date.year
p date.strftime("%A %e #{arabic_months[date.month]} %Y ")