date.php

   1 <?php
   2 /*=====================================================================*\
   3 || ###################################################################
   4 || # Blue Static ISSO Framework
   5 || # Copyright ©2002-[#]year[#] Blue Static
   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               Blue Static
  42 * @copyright    Copyright ©2002 - [#]year[#], Blue Static
  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 $offset = 0;
  83
  84         // ###################################################################
  85         /**
  86         * Constructor: sets the server's timezone
  87         */
  88         function __construct(&$registry)
  89         {
  90                 $this->registry =& $registry;
  91
  92                 $this->servertz = date('Z', TIMENOW) / 3600;
  93         }
  94
  95         // ###################################################################
  96         /**
  97         * (PHP 4) Constructor
  98         */
  99         function Date(&$registry)
 100         {
 101                 $this->__construct($registry);
 102         }
 103
 104         // ###################################################################
 105         /**
 106         * Sets the user timezone variable
 107         *
 108         * @access       public
 109         *
 110         * @param        integer User time zone
 111         */
 112         function setUserTimezone($tz)
 113         {
 114                 $this->usertz = $tz;
 115         }
 116
 117         // ###################################################################
 118         /**
 119         * Gets the user timezone variable
 120         *
 121         * @access       public
 122         *
 123         * @return       integer The user timezone
 124         */
 125         function getUserTimezone()
 126         {
 127                 return $this->usertz;
 128         }
 129
 130         // ###################################################################
 131         /**
 132         * Computes the total offset, taking into account all the various
 133         * options
 134         *
 135         * @access       public
 136         */
 137         function fetch_offset()
 138         {
 139                 $this->offsettz = $this->servertz - $this->usertz;
 140                 $this->offset = $this->offsettz * 3600;
 141         }
 142
 143         // ###################################################################
 144         /**
 145         * Formats a UNIX timestamp to a certain date format in the proper time
 146         * zone
 147         *
 148         * @access       public
 149         *
 150         * @param        string  Format of the date (same as PHP's date() function)
 151         * @param        integer UNIX timestamp to format
 152         * @param        bool    Adjust the date to the user's language?
 153         *
 154         * @return       string  Formatted date
 155         */
 156         function format($format, $timestamp = TIMENOW, $adjust = true)
 157         {
 158                 if ($adjust)
 159                 {
 160                         $timestamp -= $this->offset;
 161                 }
 162
 163                 return date($format, $timestamp);
 164         }
 165
 166         // ###################################################################
 167         /**
 168         * Fetches an array of timezones for a <select> list
 169         *
 170         * @access       public
 171         *
 172         * @return       array   List of timezones
 173         */
 174         function fetch_timezone_list()
 175         {
 176                 $opt = array();
 177
 178                 $opt['-12']             = _('(GMT - 12:00) Enitwetok, Kwajalien');
 179                 $opt['-11']             = _('(GMT - 11:00) Midway Island, Samoa');
 180                 $opt['-10']             = _('(GMT - 10:00) Hawaii');
 181                 $opt['-9']              = _('(GMT - 9:00) Alaska');
 182                 $opt['-8']              = _('(GMT - 8:00) Pacific Time (US &amp; Canada)');
 183                 $opt['-7']              = _('(GMT - 7:00) Mountain Time (US &amp; Canada)');
 184                 $opt['-6']              = _('(GMT - 6:00) Central Time (US &amp; Canada)');
 185                 $opt['-5']              = _('(GMT - 5:00) Eastern Time (US &amp; Canada)');
 186                 $opt['-4']              = _('(GMT - 4:00) Atlantic Time (Canada)');
 187                 $opt['-3.5']    = _('(GMT - 3:30) Newfoundland');
 188                 $opt['-3']              = _('(GMT - 3:00)  Brazil, Buenos Aires, Georgetown');
 189                 $opt['-2']              = _('(GMT - 2:00) Mid-Atlantic, St. Helena');
 190                 $opt['-1']              = _('(GMT - 1:00) Azores, Cape Verde Islands');
 191                 $opt['0']               = _('(GMT) London, Dublin, Casablanca');
 192                 $opt['1']               = _('(GMT + 1:00) Berlin, Madrid, Paris');
 193                 $opt['2']               = _('(GMT + 2:00) Kaliningrad, South Africa, Warsaws');
 194                 $opt['3']               = _('(GMT + 3:00) Baghdad, Moscow, Nairobi');
 195                 $opt['3.5']             = _('(GMT + 3:30) Tehran');
 196                 $opt['4']               = _('(GMT + 4:00) Abu Dhabi, Tbilisi, Muscat');
 197                 $opt['4.5']             = _('(GMT + 4:30) Kabul');
 198                 $opt['5']               = _('(GMT + 5:00) Ekaterinburg, Islamabad, Tashkent');
 199                 $opt['5.5']             = _('(GMT + 5:30) Calcutta, Madras, New Delhi');
 200                 $opt['6']               = _('(GMT + 6:00) Almaty, Colomba, Dhakra');
 201                 $opt['7']               = _('(GMT + 7:00) Bangkok, Hanoi, Jakarta');
 202                 $opt['8']               = _('(GMT + 8:00) Beijing, Hong Kong, Singapore');
 203                 $opt['9']               = _('(GMT + 9:00) Seoul, Tokyo, Yakutsk');
 204                 $opt['9.5']             = _('(GMT + 9:30) Adelaide, Darwin');
 205                 $opt['10']              = _('(GMT + 10:00) Guam, Papua New Guinea, Sydney');
 206                 $opt['11']              = _('(GMT + 11:00) Magadan, New Caledonia, Solomon Islands');
 207                 $opt['12']              = _('(GMT + 12:00) Auckland, Wellington, Fiji');
 208
 209                 return $opt;
 210         }
 211 }
 212
 213 /*=====================================================================*\
 214 || ###################################################################
 215 || # $HeadURL$
 216 || # $Id$
 217 || ###################################################################
 218 \*=====================================================================*/
 219 ?>