PHP - Executin Something After A Period

How can I add a period at the end of the sentence with this..

Code: [Select]
if($i > $max) break;
if($i == $max || ($i == count($information) && $i > 1)) echo ' and ';
else
{
if($i > 1) echo ', ';
}

if ($info[0] == 'credentials')
{
echo "credentials";
}

if ($info[0] == 'specialties')
{
echo "specialties";
}

if ($info[0] == 'stageofdevelopment')
{
echo "stage of development to {$info[1]}";
}

$i++;

How to write an IF condition for a specific time of day? e.g. between 18 and 18:30. To do something if the current time is between 18 and 18:30.

Hello,
While I am working on my code I faced this problem, which is
 Fatal error: Maximum execution time of 30 seconds exceeded in C:\wamp\www\factory1.php on line 100
Call Stack
#   Time   Memory   Function   Location
1   0.0062   379160   {main}( )   ..\factory1.php:0
Any help to come over this problem. My database is quite large (600 MB).
Thanks in advance.