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