TimeZone.php

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<?php

namespace PhpOffice\PhpSpreadsheet\Shared;

use DateTimeZone;
use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;

class TimeZone
{
    protected static $timezone = 'UTC';

    private static function validateTimeZone($timezone)
    {
        return in_array($timezone, DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC));
    }

    public static function setTimeZone($timezone)
    {
        if (self::validateTimezone($timezone)) {
            self::$timezone = $timezone;

            return true;
        }

        return false;
    }

    public static function getTimeZone()
    {
        return self::$timezone;
    }

    public static function getTimeZoneAdjustment($timezone, $timestamp)
    {
        $timezone = $timezone ?? self::$timezone;
        $dtobj = Date::dateTimeFromTimestamp("$timestamp");
        if (!self::validateTimezone($timezone)) {
            throw new PhpSpreadsheetException("Invalid timezone $timezone");
        }
        $dtobj->setTimeZone(new DateTimeZone($timezone));

        return $dtobj->getOffset();
    }
}