How to convert Eastern Time Zone to CENTRAL TIME ZONE

I have a time that is being in Eastern Time Zone, but I want to adjust it to CENTRA开发者_开发百科L TIME ZONE. Both time zones are in USA. I never do it before? I don't know how to convert it. Please help me?

This is one possible method:

$dt = new DateTime('2011-02-22 16:15:20', new DateTimeZone('America/New_York'));
echo $dt->format('r') . PHP_EOL;

$dt->setTimezone(new DateTimeZone('America/Chicago'));
echo $dt->format('r') . PHP_EOL;

You can get a list of available time zones with:

print_r(DateTimeZone::listIdentifiers());

http://www.builderau.com.au/program/php/soa/Get-the-correct-time-by-converting-between-time-zones-with-PHP-and-PEAR/0,339028448,339273806,00.htm

Or use Zend_Date.

Central Time is always 1 hour earlier than Eastern Time. To convert Eastern Time to Central Time, subtract one from the value of Eastern Time.