This is a linked open data (LOD) about date and time. "28 תמוז 5619" is a date of Hebrew Calendar-TEST (Calendar ID: 104.1).
http://datetime.hutime.org/calendar/104.1/date/28_תמוז_5619
hcal:104.1/date/2400255.5
hcal:104.1/date/28_תמוז_5619
hcaldate:2400255.5
hcaldate:28_תמוז_5619