This is a linked open data (LOD) about date and time. "C.E. 1958 June 12" is a date of Julian Calendar (Calendar ID: 102.1).
http://datetime.hutime.org/calendar/102.1/date/C.E._1958_June_12
hcal:102.1/date/2436379.5
hcal:102.1/date/C.E._1958_June_12
hcaldate:2436379.5
hcaldate:C.E._1958_June_12