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