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<?php
namespace PhpOffice\PhpSpreadsheet\Shared;
use DateTimeZone;
use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
class TimeZone
{
/**
* Default Timezone used for date/time conversions.
*
* @var string
*/
protected static $timezone = 'UTC';
/**
* Validate a Timezone name.
*
* @param string $timezoneName Time zone (e.g. 'Europe/London')
*
* @return bool Success or failure
*/
private static function validateTimeZone($timezoneName)
{
return in_array($timezoneName, DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC));
}
/**
* Set the Default Timezone used for date/time conversions.
*
* @param string $timezoneName Time zone (e.g. 'Europe/London')
*
* @return bool Success or failure
*/
public static function setTimeZone($timezoneName)
{
if (self::validateTimezone($timezoneName)) {
self::$timezone = $timezoneName;
return true;
}
return false;
}
/**
* Return the Default Timezone used for date/time conversions.
*
* @return string Timezone (e.g. 'Europe/London')
*/
public static function getTimeZone()
{
return self::$timezone;
}
/**
* Return the Timezone offset used for date/time conversions to/from UST
* This requires both the timezone and the calculated date/time to allow for local DST.
*
* @param ?string $timezoneName The timezone for finding the adjustment to UST
* @param float|int $timestamp PHP date/time value
*
* @return int Number of seconds for timezone adjustment
*/
public static function getTimeZoneAdjustment($timezoneName, $timestamp)
{
$timezoneName = $timezoneName ?? self::$timezone;
$dtobj = Date::dateTimeFromTimestamp("$timestamp");
if (!self::validateTimezone($timezoneName)) {
throw new PhpSpreadsheetException("Invalid timezone $timezoneName");
}
$dtobj->setTimeZone(new DateTimeZone($timezoneName));
return $dtobj->getOffset();
}
}