This is a linked open data (LOD) about date and time. "29 אלול 5997" is a date of Hebrew Calendar-TEST (Calendar ID: 104.1).
http://datetime.hutime.org/calendar/104.1/date/29_אלול_5997
hcal:104.1/date/2538369.5
hcal:104.1/date/29_אלול_5997
hcaldate:2538369.5
hcaldate:29_אלול_5997