How do you change the timezone in PHP for an existing timestamp?

Question

The code for the date and time function:

function date_and_time($format,$timestamp) {

$date_and_time = date($format,$timestamp);
return $date_and_time;

}
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Answer 1

Not sure if this what you're looking for, but try DateTime

date_default_timezone_set('Europe/London');

$datetime = new DateTime();
$datetime->setTimestamp($yourTimestamp);
echo $datetime->getTimezone()->getName();
echo $datetime->format(DATE_ATOM);

$la_time = new DateTimeZone('America/Los_Angeles');
$datetime->setTimezone($la_time);
echo $datetime->getTimezone()->getName();
echo $datetime->format(DATE_ATOM);

Answer 2

You can use the this function to set default time zone:

date_default_timezone_set('Europe/London');