Lost Date Formatting

I've had the same code for years for displaying a reformatted datestamp from a database. For unknown mysterious reasons, without touching the code, it stopped working correctly.

Code 1:

Quote: $result = mysql_query ($query);
while($row = mysql_fetch_array($result)) {
$month = substr($row["lastupdated"], 4, 2);
$day = substr($row["lastupdated"], 6, 2);
$year = substr($row["lastupdated"], 0, 4);
$date = $month."/".$day;
print $date;

This used to take an 8 digit datestamp like "20051005" and print it like "10/05" but now it spits out something like this "-1/0-" (may be slightly different output but screwed up none the less)

Another similar example is on another page, my the code should print it all out nicely.

Code 2:

Quote: echo "Last Updated:";
if ($myrow["lastupdated"] == "00000000") {
echo ("Unknown");
} else {

$month = substr($myrow["lastupdated"], 4, 2);
$day = substr($myrow["lastupdated"], 6, 2);
$year = substr($myrow["lastupdated"], 0, 4);
$date = $month."/".$day."/".$year;

$months = array("January", "Feburary", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
$month = $month - 1;
$dmon = $months[$month];

echo "".("$dmon $day, $year");

It should print "20051005" as something nice but it's spitting out something like "10-, 2005" (may be slightly different output but screwed up none the less)

Anybody have any idead of how all this may have changed since I didn't change my php code in years? Or how I can fix it? Thanks