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
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>Code Igniter User Guide</title>
<style type='text/css' media='all'>@import url('../userguide.css');</style>
<link rel='stylesheet' type='text/css' media='all' href='../userguide.css' />
<script type="text/javascript" src="../nav/nav.js"></script>
<script type="text/javascript" src="../nav/prototype.lite.js"></script>
<script type="text/javascript" src="../nav/moo.fx.js"></script>
<script type="text/javascript">
window.onload = function() {
myHeight = new fx.Height('nav', {duration: 400});
myHeight.hide();
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta http-equiv='expires' content='-1' />
<meta http-equiv= 'pragma' content='no-cache' />
<meta name='robots' content='all' />
<meta name='author' content='Rick Ellis' />
<meta name='description' content='Code Igniter User Guide' />
</head>
<body>
<!-- START NAVIGATION -->
<div id="nav"><div id="nav_inner"><script type="text/javascript">create_menu('../');</script></div></div>
<div id="nav2"><a name="top"></a><a href="javascript:void(0);" onclick="myHeight.toggle();"><img src="../images/nav_toggle.jpg" width="153" height="44" border="0" title="Toggle Table of Contents" alt="Toggle Table of Contents" /></a></div>
<div id="masthead">
<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
<tr>
<td><h1>Code Igniter User Guide Version 1.5.2</h1></td>
<td id="breadcrumb_right"><a href="../toc.html">Table of Contents Page</a></td>
</tr>
</table>
</div>
<!-- END NAVIGATION -->
<!-- START BREADCRUMB -->
<table cellpadding="0" cellspacing="0" border="0" style="width:100%">
<tr>
<td id="breadcrumb">
<a href="http://www.codeigniter.com/">Code Igniter Home</a> ›
<a href="../index.html">User Guide Home</a> ›
Directory Helper
</td>
<td id="searchbox"><form method="get" action="http://www.google.com/search"><input type="hidden" name="as_sitesearch" id="as_sitesearch" value="www.codeigniter.com/user_guide/" />Search User Guide <input type="text" class="input" style="width:200px;" name="q" id="q" size="31" maxlength="255" value="" /> <input type="submit" class="submit" name="sa" value="Go" /></form></td>
</tr>
</table>
<!-- END BREADCRUMB -->
<br clear="all" />
<!-- START CONTENT -->
<div id="content">
<h1>Date Helper</h1>
<p>The Date Helper file contains functions that help you work with dates.</p>
<h2>Loading this Helper</h2>
<p>This helper is loaded using the following code:</p>
<code>$this->load->helper('date');</code>
<p>The following functions are available:</p>
<h2>now()</h2>
<p>Returns the current time as a Unix timestamp, referenced either to your server's local time or GMT, based on the "time reference"
setting in your config file. If you do not intend to set your master time reference to GMT (which you'll typically do if you
run a site that lets each user set their own timezone settings) there is no benefit to using this function over PHP's time() function.
</p>
<h2>mdate()</h2>
<p>This function is identical to PHPs <a href="http://www.php.net/date">date()</a> function, except that it lets you
use MySQL style date codes, where each code letter is preceded with a percent sign: %Y %m %d etc.</p>
<p>The benefit of doing dates this way is that you don't have to worry about escaping any characters that
are not date codes, as you would normally have to do with the date() function. Example:</p>
<code>$datestring = "Year: %Y Month: %m Day: %d - %h:%i %a";<br />
$time = time();<br />
<br />
echo mdate($datestring, $time);</code>
<p>If a timestamp is not included in the second parameter the current time will be used.</p>
<h2>standard_date()</h2>
<p>Lets you generate a date string in one of several standardized formats. Example:</p>
<code>
$format = 'DATE_RFC822';<br />
$time = time();<br />
<br />
echo standard_date($format, $time);
</code>
<p>The first parameter must contain the format, the second parameter must contain the date as a Unix timestamp.</p>
<p>Supported formats:</p>
<ul>
<li>DATE_ATOM</li>
<li>DATE_COOKIE</li>
<li>DATE_ISO8601</li>
<li>DATE_RFC822</li>
<li>DATE_RFC850</li>
<li>DATE_RFC1036</li>
<li>DATE_RFC1123</li>
<li>DATE_RFC2822</li>
<li>DATE_RSS</li>
<li>DATE_W3C</li>
</ul>
<h2>local_to_gmt()</h2>
<p>Takes a Unix timestamp as input and returns it as GMT. Example:</p>
<code>$now = time();<br />
<br />
$gmt = local_to_gmt($now);</code>
<h2>gmt_to_local()</h2>
<p>Takes a Unix timestamp (referenced to GMT) as input, and converts it to a localized timestamp based on the
timezone and Daylight Saving time submitted. Example:</p>
<code>
$timestamp = '1140153693';<br />
$timezone = 'UM8';<br />
$daylight_saving = TRUE;<br />
<br />
echo gmt_to_local($timestamp, $timezone, daylight_saving);</code>
<p><strong>Note:</strong> For a list of timezones see the reference at the bottom of this page.</p>
<h2>mysql_to_unix()</h2>
<p>Takes a MySQL Timestamp as input and returns it as Unix. Example:</p>
<code>$mysql = '20061124092345';<br />
<br />
$unix = mysql_to_unix($mysql);</code>
<h2>unix_to_human()</h2>
<p>Takes a Unix timestamp as input and returns it in a human readable format with this prototype:</p>
<code>YYYY-MM-DD HH:MM:SS AM/PM</code>
<p>This can be useful if you need to display a date in a form field for submission.</p>
<p>The time can be formatted with or without seconds, and it can be set to European or US format. If only
the timestamp is submitted it will return the time without seconds formatted for the U.S. Examples:
<code>$now = time();<br />
<br />
echo unix_to_human($now); // U.S. time, no seconds<br />
<br />
echo unix_to_human($now, TRUE, 'us'); // U.S. time with seconds<br />
<br />
echo unix_to_human($now, TRUE, 'eu'); // Euro time with seconds</code>
<h2>human_to_unix()</h2>
<p>The opposite of the above function. Takes a "human" time as input and returns it as Unix. This function is
useful if you accept "human" formatted dates submitted via a form. Returns FALSE (boolean) if
the date string passed to it is not formatted as indicated above. Example:</p>
<code>$now = time();<br />
<br />
$human = unix_to_human($now);<br />
<br />
$unix = human_to_unix($human);</code>
<h2>timespan()</h2>
<p>Formats a unix timestamp so that is appears similar to this:</p>
<code>1 Year, 10 Months, 2 Weeks, 5 Days, 10 Hours, 16 Minutes</code>
<p>The first parameter must contain a Unix timestamp. The second parameter must contain a
timestamp that is greater that the first timestamp. If the second parameter empty, the current time will be used. The most common purpose
for this function is to show how much time has elapsed from some point in time in the past to now. Example:</p>
<code>$post_date = '1079621429';<br />
$now = time();<br />
<br />
echo timespan($post_date, $now);</code>
<p class="important"><strong>Note:</strong> The text generated by this function is found in the following language file: language/<your_lang>/date_lang.php</p>
<h2>days_in_month()</h2>
<p>Returns the number of days in a given month/year. Takes leap years into account. Example:</p>
<code>echo days_in_month(06, 2005);</code>
<p>If the second parameter is empty, the current year will be used.</p>
<h2>timezone_menu()</h2>
<p>Generates a pull-down menu of timezones, like this one:</p>
<form>
<select name="timezones">
<option value='UM12'>(UTC - 12:00) Enitwetok, Kwajalien</option>
<option value='UM11'>(UTC - 11:00) Nome, Midway Island, Samoa</option>
<option value='UM10'>(UTC - 10:00) Hawaii</option>
<option value='UM9'>(UTC - 9:00) Alaska</option>
<option value='UM8'>(UTC - 8:00) Pacific Time</option>
<option value='UM7'>(UTC - 7:00) Mountain Time</option>
<option value='UM6'>(UTC - 6:00) Central Time, Mexico City</option>
<option value='UM5'>(UTC - 5:00) Eastern Time, Bogota, Lima, Quito</option>
<option value='UM4'>(UTC - 4:00) Atlantic Time, Caracas, La Paz</option>
<option value='UM25'>(UTC - 3:30) Newfoundland</option>
<option value='UM3'>(UTC - 3:00) Brazil, Buenos Aires, Georgetown, Falkland Is.</option>
<option value='UM2'>(UTC - 2:00) Mid-Atlantic, Ascention Is., St Helena</option>
<option value='UM1'>(UTC - 1:00) Azores, Cape Verde Islands</option>
<option value='UTC' selected='selected'>(UTC) Casablanca, Dublin, Edinburgh, London, Lisbon, Monrovia</option>
<option value='UP1'>(UTC + 1:00) Berlin, Brussels, Copenhagen, Madrid, Paris, Rome</option>
<option value='UP2'>(UTC + 2:00) Kaliningrad, South Africa, Warsaw</option>
<option value='UP3'>(UTC + 3:00) Baghdad, Riyadh, Moscow, Nairobi</option>
<option value='UP25'>(UTC + 3:30) Tehran</option>
<option value='UP4'>(UTC + 4:00) Adu Dhabi, Baku, Muscat, Tbilisi</option>
<option value='UP35'>(UTC + 4:30) Kabul</option>
<option value='UP5'>(UTC + 5:00) Islamabad, Karachi, Tashkent</option>
<option value='UP45'>(UTC + 5:30) Bombay, Calcutta, Madras, New Delhi</option>
<option value='UP6'>(UTC + 6:00) Almaty, Colomba, Dhakra</option>
<option value='UP7'>(UTC + 7:00) Bangkok, Hanoi, Jakarta</option>
<option value='UP8'>(UTC + 8:00) Beijing, Hong Kong, Perth, Singapore, Taipei</option>
<option value='UP9'>(UTC + 9:00) Osaka, Sapporo, Seoul, Tokyo, Yakutsk</option>
<option value='UP85'>(UTC + 9:30) Adelaide, Darwin</option>
<option value='UP10'>(UTC + 10:00) Melbourne, Papua New Guinea, Sydney, Vladivostok</option>
<option value='UP11'>(UTC + 11:00) Magadan, New Caledonia, Solomon Islands</option>
<option value='UP12'>(UTC + 12:00) Auckland, Wellington, Fiji, Marshall Island</option>
</select>
</form>
<p>This menu is useful if you run a membership site in which your users are allowed to set their local timezone value.</p>
<p>The first parameter lets you set the "selected" state of the menu. For example, to set Pacific time as the default you will do this:</p>
<code>echo timezone_menu('UM8');</code>
<p>Please see the timezone reference below to see the values of this menu.</p>
<p>The second parameter lets you set a CSS class name for the menu.</p>
<p class="important"><strong>Note:</strong> The text contained in the menu is found in the following language file: language/<your_lang>/date_lang.php</p>
<h2>Timezone Reference</h2>
<p>The following table indicates each timezone and its location.</p>
<table cellpadding="0" cellspacing="1" border="0" style="width:100%" class="tableborder">
<tr>
<th>Time Zone</th>
<th>Location</th>
</tr><tr>
<td class="td">UM12</td><td class="td">(UTC - 12:00) Enitwetok, Kwajalien</td>
</tr><tr>
<td class="td">UM11</td><td class="td">(UTC - 11:00) Nome, Midway Island, Samoa</td>
</tr><tr>
<td class="td">UM10</td><td class="td">(UTC - 10:00) Hawaii</td>
</tr><tr>
<td class="td">UM9</td><td class="td">(UTC - 9:00) Alaska</td>
</tr><tr>
<td class="td">UM8</td><td class="td">(UTC - 8:00) Pacific Time</td>
</tr><tr>
<td class="td">UM7</td><td class="td">(UTC - 7:00) Mountain Time</td>
</tr><tr>
<td class="td">UM6</td><td class="td">(UTC - 6:00) Central Time, Mexico City</td>
</tr><tr>
<td class="td">UM5</td><td class="td">(UTC - 5:00) Eastern Time, Bogota, Lima, Quito</td>
</tr><tr>
<td class="td">UM4</td><td class="td">(UTC - 4:00) Atlantic Time, Caracas, La Paz</td>
</tr><tr>
<td class="td">UM25</td><td class="td">(UTC - 3:30) Newfoundland</td>
</tr><tr>
<td class="td">UM3</td><td class="td">(UTC - 3:00) Brazil, Buenos Aires, Georgetown, Falkland Is.</td>
</tr><tr>
<td class="td">UM2</td><td class="td">(UTC - 2:00) Mid-Atlantic, Ascention Is., St Helena</td>
</tr><tr>
<td class="td">UM1</td><td class="td">(UTC - 1:00) Azores, Cape Verde Islands</td>
</tr><tr>
<td class="td">UTC</td><td class="td">(UTC) Casablanca, Dublin, Edinburgh, London, Lisbon, Monrovia</td>
</tr><tr>
<td class="td">UP1</td><td class="td">(UTC + 1:00) Berlin, Brussels, Copenhagen, Madrid, Paris, Rome</td>
</tr><tr>
<td class="td">UP2</td><td class="td">(UTC + 2:00) Kaliningrad, South Africa, Warsaw</td>
</tr><tr>
<td class="td">UP3</td><td class="td">(UTC + 3:00) Baghdad, Riyadh, Moscow, Nairobi</td>
</tr><tr>
<td class="td">UP25</td><td class="td">(UTC + 3:30) Tehran</td>
</tr><tr>
<td class="td">UP4</td><td class="td">(UTC + 4:00) Adu Dhabi, Baku, Muscat, Tbilisi</td>
</tr><tr>
<td class="td">UP35</td><td class="td">(UTC + 4:30) Kabul</td>
</tr><tr>
<td class="td">UP5</td><td class="td">(UTC + 5:00) Islamabad, Karachi, Tashkent</td>
</tr><tr>
<td class="td">UP45</td><td class="td">(UTC + 5:30) Bombay, Calcutta, Madras, New Delhi</td>
</tr><tr>
<td class="td">UP6</td><td class="td">(UTC + 6:00) Almaty, Colomba, Dhakra</td>
</tr><tr>
<td class="td">UP7</td><td class="td">(UTC + 7:00) Bangkok, Hanoi, Jakarta</td>
</tr><tr>
<td class="td">UP8</td><td class="td">(UTC + 8:00) Beijing, Hong Kong, Perth, Singapore, Taipei</td>
</tr><tr>
<td class="td">UP9</td><td class="td">(UTC + 9:00) Osaka, Sapporo, Seoul, Tokyo, Yakutsk</td>
</tr><tr>
<td class="td">UP85</td><td class="td">(UTC + 9:30) Adelaide, Darwin</td>
</tr><tr>
<td class="td">UP10</td><td class="td">(UTC + 10:00) Melbourne, Papua New Guinea, Sydney, Vladivostok</td>
</tr><tr>
<td class="td">UP11</td><td class="td">(UTC + 11:00) Magadan, New Caledonia, Solomon Islands</td>
</tr><tr>
<td class="td">UP12</td><td class="td">(UTC + 12:00) Auckland, Wellington, Fiji, Marshall Island</td>
</tr>
</table>
</div>
<!-- END CONTENT -->
<div id="footer">
<p>
Previous Topic: <a href="cookie_helper.html">Cookie Helper</a>
·
<a href="#top">Top of Page</a> ·
<a href="../index.html">User Guide Home</a> ·
Next Topic: <a href="directory_helper.html">Directory Helper</a>
<p>
<p><a href="http://www.codeigniter.com">Code Igniter</a> · Copyright © 2006 · <a href="http://www.pmachine.com">pMachine, Inc.</a></p>
</div>
</body>
</html>
|
