Provide variant of EXIF recording time (“%er…”) that considers EXIF time zone where available (EXIF 2.31+)

[ocram]

if ($field[0] === 'EXIF' && $field[1] === 'DateTimeOriginal') {
	$utcOffset = !empty($exif['EXIF']['UndefinedTag:0x9011']) ? (string) $exif['EXIF']['UndefinedTag:0x9011'] : null;
}
elseif ($field[0] === 'EXIF' && $field[1] === 'DateTimeDigitized') {
	$utcOffset = !empty($exif['EXIF']['UndefinedTag:0x9012']) ? (string) $exif['EXIF']['UndefinedTag:0x9012'] : null;
}
elseif ($field[0] === 'IFD0' && $field[1] === 'DateTime') {
	$utcOffset = !empty($exif['EXIF']['UndefinedTag:0x9010']) ? (string) $exif['EXIF']['UndefinedTag:0x9010'] : null;
}
else {
	$utcOffset = null;
}

$timeZone = null;

if ($utcOffset !== null) {
	if (\preg_match('/^([+-])([01][0-9]):([0134][05])$/', $utcOffset) === 1) {
		$timeZone = new \DateTimeZone($utcOffset);
	}
}

// $dateTimeObj = ... // add $timeZone as parameter

$dateTimeObj->setTimeZone(new DateTimeZone(\date_default_timezone_get()));

if ($timeOffsetObj !== null) {
	// ...
}