From type/IO/Path

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Return an Instant object representing the timestamp when the file was last accessed. Note: depending on how the filesystem was mounted, the last accessed time may not update on each access to the file, but only on the first access after modifications.

say "path/to/file".IO.accessed;          # Instant:1424353577 
say "path/to/file".IO.accessed.DateTime; # 2015-02-19T13:45:42Z 

From type/IO/Special

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method accessed(IO::Special:D: --> Instant)

The last accessed time for the filehandle. It always returns an Instant type object.