This is a linked open data (LOD) about date and time. "C.E. 2025 January 29" is a date of Julian/Gregorian Calendar (reformed in 1752) (Calendar ID: 101.2).
http://datetime.hutime.org/calendar/101.2/date/C.E._2025_January_29
hcal:101.2/date/2460704.5
hcal:101.2/date/C.E._2025_January_29
hcaldate:2460704.5
hcaldate:C.E._2025_January_29