This is a linked open data (LOD) about date and time. "20 טבת 5786" is a date of Hebrew Calendar-TEST (Calendar ID: 104.1).
http://datetime.hutime.org/calendar/104.1/date/20_טבת_5786
hcal:104.1/date/2461049.5
hcal:104.1/date/20_טבת_5786
hcaldate:2461049.5
hcaldate:20_טבת_5786