date.php

   1 <?php
   2 /*=====================================================================*\
   3 || ###################################################################
   4 || # Iris Studios Shared Object Framework [#]version[#]
   5 || # Copyright ©2002-[#]year[#] Iris Studios, Inc.
   6 || #
   7 || # This program is free software; you can redistribute it and/or modify
   8 || # it under the terms of the GNU General Public License as published by
   9 || # the Free Software Foundation; version [#]gpl[#] of the License.
  10 || #
  11 || # This program is distributed in the hope that it will be useful, but
  12 || # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  13 || # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  14 || # more details.
  15 || #
  16 || # You should have received a copy of the GNU General Public License along
  17 || # with this program; if not, write to the Free Software Foundation, Inc.,
  18 || # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  19 || ###################################################################
  20 \*=====================================================================*/
  21
  22 /**
  23 * Date formatting system
  24 * date.php
  25 *
  26 * @package      ISSO
  27 */
  28
  29 /**
  30 * Defined constant time
  31 */
  32 define('TIMENOW', time());
  33
  34 /**
  35 * Date Formatting System
  36 *
  37 * This framework handles the complexities of date and time formatting
  38 * by taking variables like global timezone and user timezone, then
  39 * adjusting timestamps accordingly.
  40 *
  41 * @author               Iris Studios, Inc.
  42 * @copyright    Copyright ©2002 - [#]year[#], Iris Studios, Inc.
  43 * @version              $Revision$
  44 * @package              ISSO
  45 *
  46 */
  47 class Date
  48 {
  49         /**
  50         * Framework registry object
  51         * @var  object
  52         * @access       private
  53         */
  54         var $registry = null;
  55
  56         /**
  57         * User timezone offset
  58         * @var  integer
  59         * @access       public
  60         */
  61         var $usertz = 0;
  62
  63         /**
  64         * Server's timezone offset; this is set using fetch_offset()
  65         * @var  integer
  66         * @access       private
  67         */
  68         var $servertz = 0;
  69
  70         /**
  71         * Total offset timezone; this is set using fetch_offset()
  72         * @var  integer
  73         * @access       private
  74         */
  75         var $offsettz = 0;
  76
  77         /**
  78         * Offset in seconds; this is set using fetch_offset()
  79         * @var  integer
  80         * @access       private
  81         */
  82         var $offset = 0;
  83
  84         /**
  85         * Fields array that is used in this module
  86         * @var  array
  87         * @access       private
  88         */
  89         var $fields = array(
  90                 'usertz'        => array(REQ_NO,        null,   false)
  91         );
  92
  93         // ###################################################################
  94         /**
  95         * Constructor: sets the server's timezone
  96         */
  97         function __construct(&$registry)
  98         {
  99                 $this->registry =& $registry;
 100
 101                 $this->servertz = date('Z', TIMENOW) / 3600;
 102         }
 103
 104         // ###################################################################
 105         /**
 106         * (PHP 4) Constructor
 107         */
 108         function Date(&$registry)
 109         {
 110                 $this->__construct($registry);
 111         }
 112
 113         // ###################################################################
 114         /**
 115         * Sets an ISSO field
 116         *
 117         * @access       public
 118         *
 119         * @param        string  Field name
 120         * @param        mixed   Value of the field
 121         */
 122         function set($name, $value)
 123         {
 124                 $this->registry->do_set($name, $value, 'date');
 125         }
 126
 127         // ###################################################################
 128         /**
 129         * Computes the total offset, taking into account all the various
 130         * options
 131         *
 132         * @access       public
 133         */
 134         function fetch_offset()
 135         {
 136                 $this->offsettz = $this->servertz - $this->usertz;
 137                 $this->offset = $this->offsettz * 3600;
 138         }
 139
 140         // ###################################################################
 141         /**
 142         * Formats a UNIX timestamp to a certain date format in the proper time
 143         * zone
 144         *
 145         * @access       public
 146         *
 147         * @param        string  Format of the date (same as PHP's date() function)
 148         * @param        integer UNIX timestamp to format
 149         * @param        bool    Adjust the date to the user's language?
 150         *
 151         * @return       string  Formatted date
 152         */
 153         function format($format, $timestamp = TIMENOW, $adjust = true)
 154         {
 155                 if ($adjust)
 156                 {
 157                         $timestamp -= $this->offset;
 158                 }
 159
 160                 return date($format, $timestamp);
 161         }
 162
 163         // ###################################################################
 164         /**
 165         * Fetches an array of timezones for a <select> list
 166         *
 167         * @access       public
 168         *
 169         * @return       array   List of timezones
 170         */
 171         function fetch_timezone_list()
 172         {
 173                 $opt = array();
 174
 175                 $opt['-12'] = '(GMT - 12:00) Enitwetok, Kwajalien';
 176                 $opt['-11'] = '(GMT - 11:00) Midway Island, Samoa';
 177                 $opt['-10'] = '(GMT - 10:00) Hawaii';
 178                 $opt['-9'] = '(GMT - 9:00) Alaska';
 179                 $opt['-8'] = '(GMT - 8:00) Pacific Time (US &amp; Canada)';
 180                 $opt['-7'] = '(GMT - 7:00) Mountain Time (US &amp; Canada)';
 181                 $opt['-6'] = '(GMT - 6:00) Central Time (US &amp; Canada)';
 182                 $opt['-5'] = '(GMT - 5:00) Eastern Time (US &amp; Canada)';
 183                 $opt['-4'] = '(GMT - 4:00) Atlantic Time (Canada)';
 184                 $opt['-3.5'] = '(GMT - 3:30) Newfoundland';
 185                 $opt['-3'] = '(GMT - 3:00)  Brazil, Buenos Aires, Georgetown';
 186                 $opt['-2'] = '(GMT - 2:00) Mid-Atlantic, St. Helena';
 187                 $opt['-1'] = '(GMT - 1:00) Azores, Cape Verde Islands';
 188                 $opt['0'] = '(GMT) London, Dublin, Casablanca';
 189                 $opt['1'] = '(GMT + 1:00) Berlin, Madrid, Paris';
 190                 $opt['2'] = '(GMT + 2:00) Kaliningrad, South Africa, Warsaws';
 191                 $opt['3'] = '(GMT + 3:00) Baghdad, Moscow, Nairobi';
 192                 $opt['3.5'] = '(GMT + 3:30) Tehran';
 193                 $opt['4'] = '(GMT + 4:00) Abu Dhabi, Tbilisi, Muscat';
 194                 $opt['4.5'] = '(GMT + 4:30) Kabul';
 195                 $opt['5'] = '(GMT + 5:00) Ekaterinburg, Islamabad, Tashkent';
 196                 $opt['5.5'] = '(GMT + 5:30) Calcutta, Madras, New Delhi';
 197                 $opt['6'] = '(GMT + 6:00) Almaty, Colomba, Dhakra';
 198                 $opt['7'] = '(GMT + 7:00) Bangkok, Hanoi, Jakarta';
 199                 $opt['8'] = '(GMT + 8:00) Beijing, Hong Kong, Singapore';
 200                 $opt['9'] = '(GMT + 9:00) Seoul, Tokyo, Yakutsk';
 201                 $opt['9.5'] = '(GMT + 9:30) Adelaide, Darwin';
 202                 $opt['10'] = '(GMT + 10:00) Guam, Papua New Guinea, Sydney';
 203                 $opt['11'] = '(GMT + 11:00) Magadan, New Caledonia, Solomon Islands';
 204                 $opt['12'] = '(GMT + 12:00) Auckland, Wellington, Fiji';
 205
 206                 return $opt;
 207         }
 208 }
 209
 210 /*=====================================================================*\
 211 || ###################################################################
 212 || # $HeadURL$
 213 || # $Id$
 214 || ###################################################################
 215 \*=====================================================================*/
 216 ?>