sub today_is_24hours {
    my $now = 60*60*int( time()/60/60 );   # Start of this hour
    my $hour = ( localtime($now) )[2];
    $now -= $hour*60*60;                   # Start of this day
    return ( localtime($now) )[8] == ( localtime($now+24*60*60) )[8];
}