This is a linked open data (LOD) about date and time. "C.E. 2025 February 28" is a date of Julian Calendar (Calendar ID: 102.1).
http://datetime.hutime.org/calendar/102.1/date/C.E._2025_February_28
hcal:102.1/date/2460747.5
hcal:102.1/date/C.E._2025_February_28
hcaldate:2460747.5
hcaldate:C.E._2025_February_28