my @seconds = (); 
for my $date ( $date1, $date2 ) {
    my @fields = ( split( /:/, $date );
    my $frac = pop @fields;
    my $sec = pop @fields;
    push @seconds, join( '.', ( $sec, $frac ) );
}

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In reply to Re: Best way to compare date strings by Anonymous Monk
in thread Best way to compare date strings by minixman

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