wpdatatables / lib / phpoffice / phpspreadsheet / src / PhpSpreadsheet / Shared / TimeZone.php

TimeZone.php in wpDataTables – WordPress Data Table, Dynamic Tables & Table Charts Plugin 6.5.1.7, at lib/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Shared/TimeZone.php

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1	<?php
2
3	namespace PhpOffice\PhpSpreadsheet\Shared;
4
5	use DateTimeZone;
6	use PhpOffice\PhpSpreadsheet\Exception as PhpSpreadsheetException;
7
8	class TimeZone
9	{
10	/**
11	* Default Timezone used for date/time conversions.
12	*
13	* @var string
14	*/
15	protected static $timezone = 'UTC';
16
17	/**
18	* Validate a Timezone name.
19	*
20	* @param string $timezoneName Time zone (e.g. 'Europe/London')
21	*
22	* @return bool Success or failure
23	*/
24	private static function validateTimeZone(string $timezoneName): bool
25	{
26	return in_array($timezoneName, DateTimeZone::listIdentifiers(DateTimeZone::ALL_WITH_BC), true);
27	}
28
29	/**
30	* Set the Default Timezone used for date/time conversions.
31	*
32	* @param string $timezoneName Time zone (e.g. 'Europe/London')
33	*
34	* @return bool Success or failure
35	*/
36	public static function setTimeZone(string $timezoneName): bool
37	{
38	if (self::validateTimeZone($timezoneName)) {
39	self::$timezone = $timezoneName;
40
41	return true;
42	}
43
44	return false;
45	}
46
47	/**
48	* Return the Default Timezone used for date/time conversions.
49	*
50	* @return string Timezone (e.g. 'Europe/London')
51	*/
52	public static function getTimeZone(): string
53	{
54	return self::$timezone;
55	}
56
57	/**
58	* Return the Timezone offset used for date/time conversions to/from UST
59	* This requires both the timezone and the calculated date/time to allow for local DST.
60	*
61	* @param ?string $timezoneName The timezone for finding the adjustment to UST
62	* @param float\|int $timestamp PHP date/time value
63	*
64	* @return int Number of seconds for timezone adjustment
65	*/
66	public static function getTimeZoneAdjustment(?string $timezoneName, $timestamp): int
67	{
68	$timezoneName = $timezoneName ?? self::$timezone;
69	$dtobj = Date::dateTimeFromTimestamp("$timestamp");
70	if (!self::validateTimeZone($timezoneName)) {
71	throw new PhpSpreadsheetException("Invalid timezone $timezoneName");
72	}
73	$dtobj->setTimeZone(new DateTimeZone($timezoneName));
74
75	return $dtobj->getOffset();
76	}
77	}
78