e2pdf / vendors / svggraph / DateTimeFormatter.php

DateTimeFormatter.php in E2Pdf – Export Pdf Tool for WordPress 1.32.17, at vendors/svggraph/DateTimeFormatter.php

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1	<?php
2	/**
3	* Copyright (C) 2021-2022 Graham Breach
4	*
5	* This program is free software: you can redistribute it and/or modify
6	* it under the terms of the GNU Lesser General Public License as published by
7	* the Free Software Foundation, either version 3 of the License, or
8	* (at your option) any later version.
9	*
10	* This program is distributed in the hope that it will be useful,
11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13	* GNU Lesser General Public License for more details.
14	*
15	* You should have received a copy of the GNU Lesser General Public License
16	* along with this program. If not, see <http://www.gnu.org/licenses/>.
17	*/
18	/**
19	* For more information, please contact <graham@goat1000.com>
20	*/
21
22	namespace Goat1000\SVGGraph;
23
24	/**
25	* Class for formatting date/time values
26	*/
27	class DateTimeFormatter {
28
29	protected $timezone = null;
30	protected $localize = false;
31	protected $idf = null;
32
33	public function __construct()
34	{
35	$this->timezone = new \DateTimeZone(date_default_timezone_get());
36
37	// see if output needs localization
38	if(extension_loaded('intl')) {
39	$locale = setlocale(LC_TIME, 0);
40	if($locale && $locale !== 'C' && $locale !== 'POSIX' &&
41	strpos($locale, 'en_') === false) {
42	$this->localize = true;
43	$this->idf = new \IntlDateFormatter($locale,
44	\IntlDateFormatter::FULL, \IntlDateFormatter::FULL);
45	}
46	}
47	}
48
49	/**
50	* Returns the formatted, localized date/time
51	*/
52	public function format($dt, $fmt, $strip_offset = false)
53	{
54	$datetime = clone $dt;
55	$datetime->setTimezone($this->timezone);
56
57	if($strip_offset) {
58	$offset = $this->timezone->getOffset($datetime);
59	if($offset < 0)
60	$datetime->modify($offset . ' second');
61	else
62	$datetime->modify('+' . $offset . ' second');
63	}
64
65	if(!$this->localize)
66	return $datetime->format($fmt);
67
68	// DateTime class doesn't do localization, so these fields are passed to
69	// IntlDateFormatter instead
70	$map = [
71	'D' => 'E',
72	'l' => 'EEEE',
73	'M' => 'MMM',
74	'F' => 'MMMM',
75	];
76
77	$result = '';
78	$unixtime = $datetime->format('U');
79	for($i = 0; $i < strlen($fmt); ++$i) {
80	$char = $fmt[$i];
81	if(isset($map[$char])) {
82	$this->idf->setPattern($map[$char]);
83	$result .= $this->idf->format($unixtime);
84	} else {
85	$result .= $datetime->format($fmt[$i]);
86	}
87	}
88	return $result;
89	}
90
91	/**
92	* Returns the list of day names
93	*/
94	public function getLongDays()
95	{
96	return $this->getDateStrings('l', 'd');
97	}
98
99	/**
100	* Returns the list of abbreviated day names
101	*/
102	public function getShortDays()
103	{
104	return $this->getDateStrings('D', 'd');
105	}
106
107	/**
108	* Returns the list of month names
109	*/
110	public function getLongMonths()
111	{
112	return $this->getDateStrings('F', 'm');
113	}
114
115	/**
116	* Returns the list of abbreviated month names
117	*/
118	public function getShortMonths()
119	{
120	return $this->getDateStrings('M', 'm');
121	}
122
123	/**
124	* Returns a list of day or month strings using IntlDateFormatter to localize
125	*/
126	private function getDateStrings($fmt, $inc)
127	{
128	// 1978 started on a Sunday
129	$dt = new \DateTime('1978-01-01T12:00:00Z');
130	if($inc == 'm') {
131	$count = 12;
132	$offset = 'month';
133	} else {
134	$count = 7;
135	$offset = 'day';
136	}
137
138	$strings = [];
139	for($i = 0; $i < $count; ++$i) {
140	if($i)
141	$dt->modify('+1 ' . $offset);
142	$strings[] = $this->format($dt, $fmt);
143	}
144	return $strings;
145	}
146	}
147
148