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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 $timezone Time zone (e.g. 'Europe/London')
*
* @return bool Success or failure
*/
private static function validateTimeZone($timezone)
{
return in_array($timezone, DateTimeZone::listIdentifiers());
}
/**
* Set the Default Timezone used for date/time conversions.
*
* @param string $timezone Time zone (e.g. 'Europe/London')
*
* @return bool Success or failure
*/
public static function setTimeZone($timezone)
{
if (self::validateTimezone($timezone)) {
self::$timezone = $timezone;
return true;
}
return false;
}
/**
* Return the Default Timezone used for date/time conversions.
*
* @return string Timezone (e.g. 'Europe/London')
*/
public static function getTimeZone()
{
return self::$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 $timezone The timezone for finding the adjustment to UST
* @param int $timestamp PHP date/time value
*
* @throws PhpSpreadsheetException
*
* @return int Number of seconds for timezone adjustment
*/
public static function getTimeZoneAdjustment($timezone, $timestamp)
{
if ($timezone !== null) {
if (!self::validateTimezone($timezone)) {
throw new PhpSpreadsheetException('Invalid timezone ' . $timezone);
}
} else {
$timezone = self::$timezone;
}
if ($timezone == 'UST') {
return 0;
}
$objTimezone = new DateTimeZone($timezone);
$transitions = $objTimezone->getTransitions($timestamp, $timestamp);
return (count($transitions) > 0) ? $transitions[0]['offset'] : 0;
}
}