[php] get UTC time in PHP

date_default_timezone_set('Asia/Calcutta');

$current_date = date("Y/m/d g:i A");

$ist_date = DateTime::createFromFormat(
                        '"Y/m/d g:i A"',
                        $current_date,
                        new DateTimeZone('Asia/Calcutta')
                    );

$utc_date = clone $ist_date;
$utc_date->setTimeZone(new DateTimeZone('UTC'));

echo 'UTC:  ' . $utc_date->format('Y-m-d g:i A');

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