Alter Version

vendor/PhpSpreadsheet/Shared/TimeZone.php

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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(DateTimeZone::ALL_WITH_BC));
+    }
+
+    /**
+     * 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 $timestamp PHP date/time value
+     *
+     * @return int Number of seconds for timezone adjustment
+     */
+    public static function getTimeZoneAdjustment($timezone, $timestamp)
+    {
+        if ($timezone !== null) {
+            if (!self::validateTimezone($timezone)) {
+                throw new PhpSpreadsheetException('Invalid timezone ' . $timezone);
+            }
+        } else {
+            $timezone = self::$timezone;
+        }
+
+        $objTimezone = new DateTimeZone($timezone);
+        $transitions = $objTimezone->getTransitions($timestamp, $timestamp);
+
+        return (count($transitions) > 0) ? $transitions[0]['offset'] : 0;
+    }
+}