lib/hijri_umm_alqura.rb
def gd(date = self)        
      j_date = jd(date)
      g_date = HijriUmmAlqura.jd_to_gd(j_date)
      return g_date
    end
def gd(date = self)        
      j_date = jd(date)
      g_date = HijriUmmAlqura.jd_to_gd(j_date)
      return g_date
    end
Hijri to gregorian