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Derek Jonesfd93d222008-05-06 15:18:50 +0000[diff] [blame]6<title>Date Helper : CodeIgniter User Guide</title>
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53
54
55<!-- START CONTENT -->
56<div id="content">
57
58
59<h1>Date Helper</h1>
60
61<p>The Date Helper file contains functions that help you work with dates.</p>
62
63
64<h2>Loading this Helper</h2>
65
66<p>This helper is loaded using the following code:</p>
67<code>$this->load->helper('date');</code>
68
69
70<p>The following functions are available:</p>
71
72<h2>now()</h2>
73
74<p>Returns the current time as a Unix timestamp, referenced either to your server's local time or GMT, based on the "time reference"
75setting in your config file. If you do not intend to set your master time reference to GMT (which you'll typically do if you
76run a site that lets each user set their own timezone settings) there is no benefit to using this function over PHP's time() function.
77</p>
78
79
80
81
82<h2>mdate()</h2>
83
admine334c472006-10-21 19:44:22 +0000[diff] [blame]84<p>This function is identical to PHPs <a href="http://www.php.net/date">date()</a> function, except that it lets you
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]85use MySQL style date codes, where each code letter is preceded with a percent sign: %Y %m %d etc.</p>
86
87<p>The benefit of doing dates this way is that you don't have to worry about escaping any characters that
88are not date codes, as you would normally have to do with the date() function. Example:</p>
89
90<code>$datestring = "Year: %Y Month: %m Day: %d - %h:%i %a";<br />
91$time = time();<br />
92<br />
93echo mdate($datestring, $time);</code>
94
95<p>If a timestamp is not included in the second parameter the current time will be used.</p>
96
97
admine8f6eb62006-10-02 06:46:16 +0000[diff] [blame]98<h2>standard_date()</h2>
99
100<p>Lets you generate a date string in one of several standardized formats. Example:</p>
101
102<code>
103$format = 'DATE_RFC822';<br />
104$time = time();<br />
105<br />
106echo standard_date($format, $time);
107</code>
108
109<p>The first parameter must contain the format, the second parameter must contain the date as a Unix timestamp.</p>
110
111<p>Supported formats:</p>
112
Derek Allard66c474d2008-05-15 18:32:15 +0000[diff] [blame]113<table cellpadding="0" cellspacing="1" border="0" style="width:100%" class="tableborder">
114 <tr>
115 <th>Constant</th>
116 <th>Description</th>
117 <th>Example</th>
118 </tr>
119 <tr>
120 <td>DATE_ATOM</td>
121 <td>Atom</td>
122 <td>2005-08-15T16:13:03+0000</td>
123 </tr>
124 <tr>
125 <td>DATE_COOKIE</td>
126 <td>HTTP Cookies</td>
127 <td>Sun, 14 Aug 2005 16:13:03 UTC</td>
128 </tr>
129 <tr>
130 <td>DATE_ISO8601</td>
131 <td>ISO-8601</td>
132 <td>2005-08-14T16:13:03+0000</td>
133 </tr>
134 <tr>
135 <td>DATE_RFC822</td>
136 <td>RFC 822</td>
137 <td>Sun, 14 Aug 2005 16:13:03 UTC</td>
138 </tr>
139 <tr>
140 <td>DATE_RFC850</td>
141 <td>RFC 850</td>
142 <td>Sunday, 14-Aug-05 16:13:03 UTC</td>
143 </tr>
144 <tr>
145 <td>DATE_RFC1036</td>
146 <td>RFC 1036</td>
147 <td>Sunday, 14-Aug-05 16:13:03 UTC</td>
148 </tr>
149 <tr>
150 <td>DATE_RFC1123</td>
151 <td>RFC 1123</td>
152 <td>Sun, 14 Aug 2005 16:13:03 UTC</td>
153 </tr>
154 <tr>
155 <td>DATE_RFC2822</td>
156 <td>RFC 2822</td>
157 <td>Sun, 14 Aug 2005 16:13:03 +0000</td>
158 </tr>
159 <tr>
160 <td>DATE_RSS</td>
161 <td>RSS</td>
162 <td>Sun, 14 Aug 2005 16:13:03 UTC</td>
163 </tr>
164 <tr>
165 <td>DATE_W3C</td>
166 <td>World Wide Web Consortium</td>
167 <td>2005-08-14T16:13:03+0000</td>
168 </tr>
169</table>
admine8f6eb62006-10-02 06:46:16 +0000[diff] [blame]170
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]171<h2>local_to_gmt()</h2>
172
173<p>Takes a Unix timestamp as input and returns it as GMT. Example:</p>
174
175<code>$now = time();<br />
176<br />
177$gmt = local_to_gmt($now);</code>
178
179
180<h2>gmt_to_local()</h2>
181
admine334c472006-10-21 19:44:22 +0000[diff] [blame]182<p>Takes a Unix timestamp (referenced to GMT) as input, and converts it to a localized timestamp based on the
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]183timezone and Daylight Saving time submitted. Example:</p>
184
185<code>
186$timestamp = '1140153693';<br />
187$timezone = 'UM8';<br />
188$daylight_saving = TRUE;<br />
189<br />
Derek Allarda4d6b3f2007-10-28 15:33:52 +0000[diff] [blame]190echo gmt_to_local($timestamp, $timezone, $daylight_saving);</code>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]191
192<p><strong>Note:</strong> For a list of timezones see the reference at the bottom of this page.</p>
193
194<h2>mysql_to_unix()</h2>
195
196<p>Takes a MySQL Timestamp as input and returns it as Unix. Example:</p>
197
198<code>$mysql = '20061124092345';<br />
199<br />
200$unix = mysql_to_unix($mysql);</code>
201
202
203<h2>unix_to_human()</h2>
204
205<p>Takes a Unix timestamp as input and returns it in a human readable format with this prototype:</p>
206
207<code>YYYY-MM-DD HH:MM:SS AM/PM</code>
208
209<p>This can be useful if you need to display a date in a form field for submission.</p>
210
admine334c472006-10-21 19:44:22 +0000[diff] [blame]211<p>The time can be formatted with or without seconds, and it can be set to European or US format. If only
Derek Allardc6441282007-07-04 23:54:32 +0000[diff] [blame]212the timestamp is submitted it will return the time without seconds formatted for the U.S. Examples:</p>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]213
214<code>$now = time();<br />
215<br />
216echo unix_to_human($now); // U.S. time, no seconds<br />
217<br />
218echo unix_to_human($now, TRUE, 'us'); // U.S. time with seconds<br />
219<br />
220echo unix_to_human($now, TRUE, 'eu'); // Euro time with seconds</code>
221
222
223<h2>human_to_unix()</h2>
224
admine334c472006-10-21 19:44:22 +0000[diff] [blame]225<p>The opposite of the above function. Takes a "human" time as input and returns it as Unix. This function is
226useful if you accept "human" formatted dates submitted via a form. Returns FALSE (boolean) if
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]227the date string passed to it is not formatted as indicated above. Example:</p>
228
229<code>$now = time();<br />
230<br />
231$human = unix_to_human($now);<br />
232<br />
233$unix = human_to_unix($human);</code>
234
235
236
237
238
239<h2>timespan()</h2>
240
241<p>Formats a unix timestamp so that is appears similar to this:</p>
242
243<code>1 Year, 10 Months, 2 Weeks, 5 Days, 10 Hours, 16 Minutes</code>
244
245<p>The first parameter must contain a Unix timestamp. The second parameter must contain a
admine7e1dcd2006-10-21 18:04:01 +0000[diff] [blame]246timestamp that is greater that the first timestamp. If the second parameter empty, the current time will be used. The most common purpose
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]247for this function is to show how much time has elapsed from some point in time in the past to now. Example:</p>
248
249<code>$post_date = '1079621429';<br />
250$now = time();<br />
251<br />
252echo timespan($post_date, $now);</code>
253
254<p class="important"><strong>Note:</strong> The text generated by this function is found in the following language file: language/&lt;your_lang&gt;/date_lang.php</p>
255
256
257<h2>days_in_month()</h2>
258
259<p>Returns the number of days in a given month/year. Takes leap years into account. Example:</p>
260<code>echo days_in_month(06, 2005);</code>
261
262<p>If the second parameter is empty, the current year will be used.</p>
Derek Allardfc40afd2007-08-14 11:41:16 +0000[diff] [blame]263<h2>timezones()</h2>
264<p> Takes a timezone reference (for a list of valid timezones, see the &quot;Timezone Reference&quot; below) and returns the number of hours offset from UTC.</p>
265<p><code>echo timezones('UM5');</code></p>
266<p>This function is useful when used with timezone_menu(). </p>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]267<h2>timezone_menu()</h2>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]268<p>Generates a pull-down menu of timezones, like this one:</p>
269
Derek Allardce66d152008-03-04 20:55:55 +0000[diff] [blame]270<form action="#">
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]271<select name="timezones">
272<option value='UM12'>(UTC - 12:00) Enitwetok, Kwajalien</option>
273<option value='UM11'>(UTC - 11:00) Nome, Midway Island, Samoa</option>
274<option value='UM10'>(UTC - 10:00) Hawaii</option>
275<option value='UM9'>(UTC - 9:00) Alaska</option>
276<option value='UM8'>(UTC - 8:00) Pacific Time</option>
277<option value='UM7'>(UTC - 7:00) Mountain Time</option>
278<option value='UM6'>(UTC - 6:00) Central Time, Mexico City</option>
279<option value='UM5'>(UTC - 5:00) Eastern Time, Bogota, Lima, Quito</option>
280<option value='UM4'>(UTC - 4:00) Atlantic Time, Caracas, La Paz</option>
281<option value='UM25'>(UTC - 3:30) Newfoundland</option>
282<option value='UM3'>(UTC - 3:00) Brazil, Buenos Aires, Georgetown, Falkland Is.</option>
283<option value='UM2'>(UTC - 2:00) Mid-Atlantic, Ascention Is., St Helena</option>
284<option value='UM1'>(UTC - 1:00) Azores, Cape Verde Islands</option>
285<option value='UTC' selected='selected'>(UTC) Casablanca, Dublin, Edinburgh, London, Lisbon, Monrovia</option>
286<option value='UP1'>(UTC + 1:00) Berlin, Brussels, Copenhagen, Madrid, Paris, Rome</option>
287<option value='UP2'>(UTC + 2:00) Kaliningrad, South Africa, Warsaw</option>
288<option value='UP3'>(UTC + 3:00) Baghdad, Riyadh, Moscow, Nairobi</option>
289<option value='UP25'>(UTC + 3:30) Tehran</option>
290<option value='UP4'>(UTC + 4:00) Adu Dhabi, Baku, Muscat, Tbilisi</option>
291<option value='UP35'>(UTC + 4:30) Kabul</option>
292<option value='UP5'>(UTC + 5:00) Islamabad, Karachi, Tashkent</option>
293<option value='UP45'>(UTC + 5:30) Bombay, Calcutta, Madras, New Delhi</option>
294<option value='UP6'>(UTC + 6:00) Almaty, Colomba, Dhakra</option>
295<option value='UP7'>(UTC + 7:00) Bangkok, Hanoi, Jakarta</option>
296<option value='UP8'>(UTC + 8:00) Beijing, Hong Kong, Perth, Singapore, Taipei</option>
297<option value='UP9'>(UTC + 9:00) Osaka, Sapporo, Seoul, Tokyo, Yakutsk</option>
298<option value='UP85'>(UTC + 9:30) Adelaide, Darwin</option>
299<option value='UP10'>(UTC + 10:00) Melbourne, Papua New Guinea, Sydney, Vladivostok</option>
300<option value='UP11'>(UTC + 11:00) Magadan, New Caledonia, Solomon Islands</option>
301<option value='UP12'>(UTC + 12:00) Auckland, Wellington, Fiji, Marshall Island</option>
302</select>
303</form>
304
305<p>This menu is useful if you run a membership site in which your users are allowed to set their local timezone value.</p>
306
admine7e1dcd2006-10-21 18:04:01 +0000[diff] [blame]307<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>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]308
309<code>echo timezone_menu('UM8');</code>
310
311<p>Please see the timezone reference below to see the values of this menu.</p>
312
313<p>The second parameter lets you set a CSS class name for the menu.</p>
314
315<p class="important"><strong>Note:</strong> The text contained in the menu is found in the following language file: language/&lt;your_lang&gt;/date_lang.php</p>
316
317
318
319<h2>Timezone Reference</h2>
320
321<p>The following table indicates each timezone and its location.</p>
322
323<table cellpadding="0" cellspacing="1" border="0" style="width:100%" class="tableborder">
324<tr>
325<th>Time Zone</th>
326<th>Location</th>
327</tr><tr>
328
329<td class="td">UM12</td><td class="td">(UTC - 12:00) Enitwetok, Kwajalien</td>
330</tr><tr>
331<td class="td">UM11</td><td class="td">(UTC - 11:00) Nome, Midway Island, Samoa</td>
332</tr><tr>
333<td class="td">UM10</td><td class="td">(UTC - 10:00) Hawaii</td>
334</tr><tr>
335<td class="td">UM9</td><td class="td">(UTC - 9:00) Alaska</td>
336</tr><tr>
337<td class="td">UM8</td><td class="td">(UTC - 8:00) Pacific Time</td>
338</tr><tr>
339<td class="td">UM7</td><td class="td">(UTC - 7:00) Mountain Time</td>
340</tr><tr>
341<td class="td">UM6</td><td class="td">(UTC - 6:00) Central Time, Mexico City</td>
342</tr><tr>
343<td class="td">UM5</td><td class="td">(UTC - 5:00) Eastern Time, Bogota, Lima, Quito</td>
344</tr><tr>
345<td class="td">UM4</td><td class="td">(UTC - 4:00) Atlantic Time, Caracas, La Paz</td>
346</tr><tr>
347<td class="td">UM25</td><td class="td">(UTC - 3:30) Newfoundland</td>
348</tr><tr>
349<td class="td">UM3</td><td class="td">(UTC - 3:00) Brazil, Buenos Aires, Georgetown, Falkland Is.</td>
350</tr><tr>
351<td class="td">UM2</td><td class="td">(UTC - 2:00) Mid-Atlantic, Ascention Is., St Helena</td>
352</tr><tr>
353<td class="td">UM1</td><td class="td">(UTC - 1:00) Azores, Cape Verde Islands</td>
354</tr><tr>
Rick Ellis325197e2006-11-20 17:29:05 +0000[diff] [blame]355<td class="td">UTC</td><td class="td">(UTC) Casablanca, Dublin, Edinburgh, London, Lisbon, Monrovia</td>
adminb0dd10f2006-08-25 17:25:49 +0000[diff] [blame]356</tr><tr>
357<td class="td">UP1</td><td class="td">(UTC + 1:00) Berlin, Brussels, Copenhagen, Madrid, Paris, Rome</td>
358</tr><tr>
359<td class="td">UP2</td><td class="td">(UTC + 2:00) Kaliningrad, South Africa, Warsaw</td>
360</tr><tr>
361<td class="td">UP3</td><td class="td">(UTC + 3:00) Baghdad, Riyadh, Moscow, Nairobi</td>
362</tr><tr>
363<td class="td">UP25</td><td class="td">(UTC + 3:30) Tehran</td>
364</tr><tr>
365<td class="td">UP4</td><td class="td">(UTC + 4:00) Adu Dhabi, Baku, Muscat, Tbilisi</td>
366</tr><tr>
367<td class="td">UP35</td><td class="td">(UTC + 4:30) Kabul</td>
368</tr><tr>
369<td class="td">UP5</td><td class="td">(UTC + 5:00) Islamabad, Karachi, Tashkent</td>
370</tr><tr>
371<td class="td">UP45</td><td class="td">(UTC + 5:30) Bombay, Calcutta, Madras, New Delhi</td>
372</tr><tr>
373<td class="td">UP6</td><td class="td">(UTC + 6:00) Almaty, Colomba, Dhakra</td>
374</tr><tr>
375<td class="td">UP7</td><td class="td">(UTC + 7:00) Bangkok, Hanoi, Jakarta</td>
376</tr><tr>
377<td class="td">UP8</td><td class="td">(UTC + 8:00) Beijing, Hong Kong, Perth, Singapore, Taipei</td>
378</tr><tr>
379<td class="td">UP9</td><td class="td">(UTC + 9:00) Osaka, Sapporo, Seoul, Tokyo, Yakutsk</td>
380</tr><tr>
381<td class="td">UP85</td><td class="td">(UTC + 9:30) Adelaide, Darwin</td>
382</tr><tr>
383<td class="td">UP10</td><td class="td">(UTC + 10:00) Melbourne, Papua New Guinea, Sydney, Vladivostok</td>
384</tr><tr>
385<td class="td">UP11</td><td class="td">(UTC + 11:00) Magadan, New Caledonia, Solomon Islands</td>
386</tr><tr>
387<td class="td">UP12</td><td class="td">(UTC + 12:00) Auckland, Wellington, Fiji, Marshall Island</td>
388</tr>
389</table>
390
391
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