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Niklas Holsti <niklas.holsti@tidorum.invalid> writes:

> Ada.Directories.Modification_Time returns a value of type
> Ada.Calendar.Time. However, "the time base associated with the type
> Time of package Calendar is implementation defined" (RM 9.6(23)) so it
> should be documented in the implementation documents, that is in the
> GNAT documentation. Have you looked there?

The GNAT RM says in Implementation Defined Characteristics[1]

"The time base used is that provided by the C library function gettimeofday."

[1] https://docs.adacore.com/live/wave/gnat_rm/html/gnat_rm/gnat_rm/implementation_defined_characteristics.html