-
-
Notifications
You must be signed in to change notification settings - Fork 9.4k
/
TimezoneTransformer.php
117 lines (100 loc) · 3.96 KB
/
TimezoneTransformer.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Intl\DateFormatter\DateFormat;
use Symfony\Component\Intl\Exception\NotImplementedException;
/**
* Parser and formatter for time zone format.
*
* @author Igor Wiedler <igor@wiedler.ch>
*
* @internal
*/
class TimezoneTransformer extends Transformer
{
/**
* {@inheritdoc}
*
* @throws NotImplementedException When time zone is different than UTC or GMT (Etc/GMT)
*/
public function format(\DateTime $dateTime, int $length): string
{
$timeZone = substr($dateTime->getTimezone()->getName(), 0, 3);
if (!\in_array($timeZone, ['Etc', 'UTC', 'GMT'])) {
throw new NotImplementedException('Time zone different than GMT or UTC is not supported as a formatting output.');
}
if ('Etc' === $timeZone) {
// i.e. Etc/GMT+1, Etc/UTC, Etc/Zulu
$timeZone = substr($dateTime->getTimezone()->getName(), 4);
}
// From ICU >= 59.1 GMT and UTC are no longer unified
if (\in_array($timeZone, ['UTC', 'UCT', 'Universal', 'Zulu'])) {
// offset is not supported with UTC
return $length > 3 ? 'Coordinated Universal Time' : 'UTC';
}
$offset = (int) $dateTime->format('O');
// From ICU >= 4.8, the zero offset is no more used, example: GMT instead of GMT+00:00
if (0 === $offset) {
return $length > 3 ? 'Greenwich Mean Time' : 'GMT';
}
if ($length > 3) {
return $dateTime->format('\G\M\TP');
}
return sprintf('GMT%s%d', ($offset >= 0 ? '+' : ''), $offset / 100);
}
/**
* {@inheritdoc}
*/
public function getReverseMatchingRegExp(int $length): string
{
return 'GMT[+-]\d{2}:?\d{2}';
}
/**
* {@inheritdoc}
*/
public function extractDateOptions(string $matched, int $length): array
{
return [
'timezone' => self::getEtcTimeZoneId($matched),
];
}
/**
* Get an Etc/GMT timezone identifier for the specified timezone.
*
* The PHP documentation for timezones states to not use the 'Other' time zones because them exists
* "for backwards compatibility". However all Etc/GMT time zones are in the tz database 'etcetera' file,
* which indicates they are not deprecated (neither are old names).
*
* Only GMT, Etc/Universal, Etc/Zulu, Etc/Greenwich, Etc/GMT-0, Etc/GMT+0 and Etc/GMT0 are old names and
* are linked to Etc/GMT or Etc/UTC.
*
* @param string $formattedTimeZone A GMT timezone string (GMT-03:00, e.g.)
*
* @return string A timezone identifier
*
* @see http://php.net/manual/en/timezones.others.php
* @see http://www.twinsun.com/tz/tz-link.htm
*
* @throws NotImplementedException When the GMT time zone have minutes offset different than zero
* @throws \InvalidArgumentException When the value can not be matched with pattern
*/
public static function getEtcTimeZoneId($formattedTimeZone)
{
if (preg_match('/GMT(?P<signal>[+-])(?P<hours>\d{2}):?(?P<minutes>\d{2})/', $formattedTimeZone, $matches)) {
$hours = (int) $matches['hours'];
$minutes = (int) $matches['minutes'];
$signal = '-' == $matches['signal'] ? '+' : '-';
if (0 < $minutes) {
throw new NotImplementedException(sprintf('It is not possible to use a GMT time zone with minutes offset different than zero (0). GMT time zone tried: %s.', $formattedTimeZone));
}
return 'Etc/GMT'.(0 !== $hours ? $signal.$hours : '');
}
throw new \InvalidArgumentException(sprintf('The GMT time zone "%s" does not match with the supported formats GMT[+-]HH:MM or GMT[+-]HHMM.', $formattedTimeZone));
}
}