It’s really very simple to convert times in different timezones using the following function.

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function dateTimeConversion($datetime, 
$timezone="Europe/London") {
  $date = new DateTime($datetime, new DateTimeZone("UTC"));
  $date->setTimezone($timezone);
  return $date->format("Y-m-d H:i:s");
}

As you can see, it takes 2 arguments, $datetime which is a time string and a $timezone which is a timezone to convert to.

A usage example would be:

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echo dateTimeConversion("2012-05-01 17:09:58");