The Time::Piece module, along with its associated Time::Seconds module for date calculations, is core.
johngg@abouriou:~/perl/Monks$ perl -Mstrict -Mwarnings -MTime::Piece -
+MTime::Seconds -E 'say q{};
my $date = q{Sat Jun 4 22:47:31 2022};
my $tp = Time::Piece->strptime( $date, q{%a %b %d %T %Y} );
$tp -= ONE_HOUR;
$tp -= ONE_HOUR;
say $tp->strftime();'
Sat, 04 Jun 2022 20:47:31 UTC
I hope that this is helpful.
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