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 $OBJECT = 'Date Formatting System';
  30 $CLASS = 'Date_Formatter';
  31 $OBJ = 'datef';
  32
  33 /**
  34 * Defined constant time
  35 */
  36 define('TIMENOW', time());
  37
  38 /**
  39 * Date Formatting System
  40 *
  41 * This framework handles the complexities of date and time formatting
  42 * by taking variables like global timezone and user timezone, then
  43 * adjusting timestamps accordingly.
  44 *
  45 * @author               Iris Studios, Inc.
  46 * @copyright    Copyright ©2002 - [#]year[#], Iris Studios, Inc.
  47 * @version              $Revision$
  48 * @package              ISSO
  49 *
  50 */
  51 class Date
  52 {
  53         /**
  54         * Framework registry object
  55         * @var  object
  56         */
  57         var $registry = null;
  58
  59         /**
  60         * User timezone offset
  61         * @var  integer
  62         */
  63         var $usertz = 0;
  64
  65         /**
  66         * Server's timezone offset
  67         * @var  integer
  68         */
  69         var $servertz = 0;
  70
  71         /**
  72         * Total offset timezone
  73         * @var  integer
  74         */
  75         var $offsettz = 0;
  76
  77         /**
  78         * Offset in seconds
  79         * @var  integer
  80         */
  81         var $offset = 0;
  82
  83         /**
  84         * Constructor: sets the server's timezone
  85         */
  86         function Date_Formatter(&$registry)
  87         {
  88                 $this->registry =& $registry;
  89
  90                 $this->servertz = date('Z', TIMENOW) / 3600;
  91         }
  92
  93         /**
  94         * Computes the total offset, taking into account all
  95         * the various options
  96         */
  97         function fetch_offset()
  98         {
  99                 $this->offsettz = $this->servertz - $this->usertz;
 100                 $this->offset = $this->offsettz * 3600;
 101         }
 102
 103         /**
 104         * Formats a UNIX timestamp to a certain date format in the proper time zone
 105         *
 106         * @param        string  Format of the date (same as PHP's date() function)
 107         * @param        integer UNIX timestamp to format
 108         * @param        bool    Adjust the date to the user's language?
 109         *
 110         * @return       string  Formatted date
 111         */
 112         function format($format, $timestamp = TIMENOW, $adjust = true)
 113         {
 114                 if ($adjust)
 115                 {
 116                         $timestamp -= $this->offset;
 117                 }
 118
 119                 return date($format, $timestamp);
 120         }
 121
 122         /**
 123         * Fetches an array of timezones for a <select> list
 124         *
 125         * @return       array   List of timezones
 126         */
 127         function fetch_timezone_list()
 128         {
 129                 $opt = array();
 130
 131                 $opt['-12'] = '(GMT - 12:00) Enitwetok, Kwajalien';
 132                 $opt['-11'] = '(GMT - 11:00) Midway Island, Samoa';
 133                 $opt['-10'] = '(GMT - 10:00) Hawaii';
 134                 $opt['-9'] = '(GMT - 9:00) Alaska';
 135                 $opt['-8'] = '(GMT - 8:00) Pacific Time (US &amp; Canada)';
 136                 $opt['-7'] = '(GMT - 7:00) Mountain Time (US &amp; Canada)';
 137                 $opt['-6'] = '(GMT - 6:00) Central Time (US &amp; Canada)';
 138                 $opt['-5'] = '(GMT - 5:00) Eastern Time (US &amp; Canada)';
 139                 $opt['-4'] = '(GMT - 4:00) Atlantic Time (Canada)';
 140                 $opt['-3.5'] = '(GMT - 3:30) Newfoundland';
 141                 $opt['-3'] = '(GMT - 3:00)  Brazil, Buenos Aires, Georgetown';
 142                 $opt['-2'] = '(GMT - 2:00) Mid-Atlantic, St. Helena';
 143                 $opt['-1'] = '(GMT - 1:00) Azores, Cape Verde Islands';
 144                 $opt['0'] = '(GMT) London, Dublin, Casablanca';
 145                 $opt['1'] = '(GMT + 1:00) Berlin, Madrid, Paris';
 146                 $opt['2'] = '(GMT + 2:00) Kaliningrad, South Africa, Warsaws';
 147                 $opt['3'] = '(GMT + 3:00) Baghdad, Moscow, Nairobi';
 148                 $opt['3.5'] = '(GMT + 3:30) Tehran';
 149                 $opt['4'] = '(GMT + 4:00) Abu Dhabi, Tbilisi, Muscat';
 150                 $opt['4.5'] = '(GMT + 4:30) Kabul';
 151                 $opt['5'] = '(GMT + 5:00) Ekaterinburg, Islamabad, Tashkent';
 152                 $opt['5.5'] = '(GMT + 5:30) Calcutta, Madras, New Delhi';
 153                 $opt['6'] = '(GMT + 6:00) Almaty, Colomba, Dhakra';
 154                 $opt['7'] = '(GMT + 7:00) Bangkok, Hanoi, Jakarta';
 155                 $opt['8'] = '(GMT + 8:00) Beijing, Hong Kong, Singapore';
 156                 $opt['9'] = '(GMT + 9:00) Seoul, Tokyo, Yakutsk';
 157                 $opt['9.5'] = '(GMT + 9:30) Adelaide, Darwin';
 158                 $opt['10'] = '(GMT + 10:00) Guam, Papua New Guinea, Sydney';
 159                 $opt['11'] = '(GMT + 11:00) Magadan, New Caledonia, Solomon Islands';
 160                 $opt['12'] = '(GMT + 12:00) Auckland, Wellington, Fiji';
 161
 162                 return $opt;
 163         }
 164 }
 165
 166 /*=====================================================================*\
 167 || ###################################################################
 168 || # $HeadURL$
 169 || # $Id$
 170 || ###################################################################
 171 \*=====================================================================*/
 172 ?>