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