This is a linked open data (LOD) about date and time. "C.E. 2024 May 15" is a date of Gregorian Calendar (Calendar ID: 2.1).
http://datetime.hutime.org/calendar/2.1/date/C.E._2024_May_15
hcal:2.1/date/2460445.5
hcal:2.1/date/C.E._2024_May_15
hcaldate:2460445.5
hcaldate:C.E._2024_May_15