This is a linked open data (LOD) about date and time. "C.E. 2025 February 28" is a date of Gregorian Calendar (Calendar ID: 2.1).
http://datetime.hutime.org/calendar/2.1/date/C.E._2025_February_28
hcal:2.1/date/2460734.5
hcal:2.1/date/C.E._2025_February_28
hcaldate:2460734.5
hcaldate:C.E._2025_February_28