This is a linked open data (LOD) about date and time. "15 סיון 5785" is a date of Hebrew Calendar-TEST (Calendar ID: 104.1).
http://datetime.hutime.org/calendar/104.1/date/15_סיון_5785
hcal:104.1/date/2460837.5
hcal:104.1/date/15_סיון_5785
hcaldate:2460837.5
hcaldate:15_סיון_5785