Is there a function that converts DateObjects to decimal years?

Questions
1

I have been seeing climate data sets that use decimal years. This is very convenient for some things. Is there a Mathematica function that converts DateObjects to decimal years?

2

By “decimal years” do you mean something like today (April 5) is 0.26 years from the beginning of the year?

DateDifference[DateObject[{2024, 1}], DateObject[{2024, 4, 5}], "Year"]
(* Quantity[0.25956284153005466, "Years"] *)
3

Something like this?

1900. + AbsoluteTime[Today]/
  QuantityMagnitude[Quantity[1, "Years"], "Seconds"]
4

Thanks! I’ll check it out.

5

Thanks, Eric! I appreciate the help.

6

Notice that

1900. + AbsoluteTime[{2024,12,31}]/QuantityMagnitude[Quantity[1,"Years"],"Seconds"]
(* 2025.03 *)

This seems better:

DateValue[{2024,12,31},"Year"] + DateValue[{2024,12,31},"YearFraction"]
(* 2024.95 *)