This is a linked open data (LOD) about date and time. "09/12/1220" is a date of Hijri Calendar-TEST (Calendar ID: 9103.2).
http://datetime.hutime.org/calendar/9103.2/date/09/12/1220
hcal:9103.2/date/2380745.5
hcal:9103.2/date/09/12/1220
hcaldate:2380745.5
hcaldate:09/12/1220