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        fractional_second
        week week_year week_number
        mjd jd
        nanosecond millisecond microsecond
        epoch
    );

    for my $meth (@ification_methods) {
        is( $pos->$meth, $posinf, "+Infinity $meth returns $posinf" );
        is( $neg->$meth, $neginf, "-Infinity $meth returns $neginf" );
    }

    # that's a long time ago!
    my $long_ago = DateTime->new( year => -100_000 );

    ok(
        $neg < $long_ago,
        'negative infinity is really negative'
    );

    my $far_future = DateTime->new( year => 100_000 );
    ok(
        $pos > $far_future,
        'positive infinity is really positive'
    );

    ok(
        $pos > $neg,
        'positive infinity is bigger than negative infinity'
    );

    my $pos_dur = $pos - $far_future;
    ok(
        $pos_dur->is_positive,
        'infinity - normal = infinity'
    );

    my $pos2 = $long_ago + $pos_dur;
    ok(
        $pos2 == $pos,
        'normal + infinite duration = infinity'
    );

    my $neg_dur = $far_future - $pos;
    ok(
        $neg_dur->is_negative,
        'normal - infinity = neg infinity'
    );

    my $neg2 = $long_ago + $neg_dur;
    ok(
        $neg2 == $neg,
        'normal + neg infinite duration = neg infinity'
    );

    my $dur     = $pos - $pos;
    my %deltas  = $dur->deltas;
    my @compare = qw( days seconds nanoseconds );
    foreach (@compare) {

        # NaN != NaN (but should stringify the same)
        is(
            $deltas{$_} . q{}, $nan_string,
            "infinity - infinity = nan ($_)"
        );
    }

    my $new_pos = $pos->clone->add( days => 10 );
    ok(
        $new_pos == $pos,
        'infinity + normal duration = infinity'
    );

    my $new_pos2 = $pos->clone->subtract( days => 10 );
    ok(
        $new_pos2 == $pos,
        'infinity - normal duration = infinity'
    );

    ok(
        $pos == $posinf,
        'infinity (datetime) == infinity (number)'
    );

    ok(
        $neg == $neginf,
        'neg infinity (datetime) == neg infinity (number)'
    );
}

# This could vary across platforms
my $pos_as_string = $posinf . q{};
my $neg_as_string = $neginf . q{};

# formatting
{
    foreach my $m (
        qw( year month day hour minute second
        microsecond millisecond nanosecond )
    ) {
        is(
            $pos->$m() . q{}, $pos_as_string,
            "pos $m is $pos_as_string"
        );

        is(
            $neg->$m() . q{}, $neg_as_string,
            "neg $m is $pos_as_string"
        );
    }
}

{
    my $now = DateTime->now;

    is(
        DateTime->compare( $pos, $now ), 1,
        'positive infinite is greater than now'
    );
    is(
        DateTime->compare( $neg, $now ), -1,