Setting Default Timezone - How?

I'm working on a 1and1 server and I'm getting this message on one of my calendar pages:

Strict Standards: strtotime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /homepages/42/d514133230/htdocs/adm/calendar_insert_execute.php on line 44

Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /homepages/42/d514133230/htdocs/adm/calendar_insert_execute.php on line 44

Strict Standards: strtotime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /homepages/42/d514133230/htdocs/adm/calendar_insert_execute.php on line 54

Strict Standards: date(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected 'America/New_York' for 'EST/-5.0/no DST' instead in /homepages/42/d514133230/htdocs/adm/calendar_insert_execute.php on line 54

I put this in my header and I got the same error. What do I need to do to satisfy the system's concerns?

<?php
date_default_timezone_set('America/Chicago');
?>
brucegustPHP DeveloperAsked:
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Dave BaldwinFixer of ProblemsCommented:
That is the correct way to set it.  It does have to be set on each and every page that uses any date or time functions.  And it needs to be at the top of the page before any of those functions are used.
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Ray PaseurCommented:
You should call 1and1 and tell them you want the default timezone settings placed in the php.ini file or the .htaccess file.  It is their responsibility to provide you with a working web server, and one that is spewing messages is not working correctly.  You should not be forced to modify every one of your scripts, even if you can do that.

With that said, here is how I create a web page.

<?php require_once('common.php');
/* REST OF THE CODE GOES HERE */

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The common.php script contains all of the common elements that my site might require - it sets the error_reporting(), starts the session, establishes the data base connection, loads all of the functions and classes, etc.  If your scripts are all started with a common.php script, you have a one-line change to add the default timezone setting, and it will be in effect on every page.
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