Try using Gmtime not Localtime ... at least on my machine it goes from 05:13:27 to 12:13:27, much closer to 13:13:27 
while( my( $epoch, $wanted ) = each %date_pairs ){
    use Time::Piece qw/ localtime gmtime /;
    use Date::Language;
    my $tp  = gmtime( $epoch );
    $tp = $tp->add_years( 31 );
    my $lang = Date::Language->new('German');
    my $got = $lang->strftime("%A, %d.%m.%Y - %H:%M:%S", $tp );
    print "$got\n$wanted\n\n";
}

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In reply to Re: Date::Calc and and daylight savings time by Anonymous Monk
in thread Date::Calc and and daylight savings time by marek1703

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