This is a linked open data (LOD) about date and time. "30 ذو الحجة 1090" is a date of Hijri Calendar-TEST (Calendar ID: 103.1).
http://datetime.hutime.org/calendar/103.1/date/30_ذو الحجة_1090
hcal:103.1/date/2334697.5
hcal:103.1/date/30_ذو الحجة_1090
hcaldate:2334697.5
hcaldate:30_ذو الحجة_1090