<?php
   /**
    **  date.php
    **
    **  Takes a date and parses it into a usable format.  The form that a
    **  date SHOULD arrive in is:
    **        <Tue,> 29 Jun 1999 09:52:11 -0500 (EDT)
    **  (as specified in RFC 822) -- 'Tue' is optional
    **
    **  $Id$
    **/

   if (defined ('date_php'))
      return; 
   define ('date_php', true);
   
   // corrects a time stamp to be the local time
   function getGMTSeconds($stamp, $gmt) {
      global $invert_time;
      if (($gmt == 'Pacific') || ($gmt == 'PST'))
         $gmt = '-0800';
      else if (($gmt == 'EDT'))
         $gmt = '-0400';
      else if (($gmt == 'Eastern') || ($gmt == 'EST') || ($gmt == 'CDT'))
         $gmt = '-0500';
      else if (($gmt == 'Central') || ($gmt == 'CST') || ($gmt == 'MDT'))
         $gmt = '-0600';
      else if (($gmt == 'Mountain') || ($gmt == 'MST') || ($gmt == 'PDT'))
         $gmt = '-0700';
      else if ($gmt == 'BST')
         $gmt = '+0100';
      else if ($gmt == 'EET')
         $gmt = '+0200';
      else if ($gmt == 'GMT')
         $gmt = '+0000';
      else if ($gmt == 'HKT')
         $gmt = '+0800';
      else if ($gmt == 'IST')
         $gmt = '+0200';
      else if ($gmt == 'JST')
         $gmt = '+0900';
      else if ($gmt == 'KST')
         $gmt = "+0900";
      else if ($gmt == 'MET')
         $gmt = '+0100';
      else if ($gmt == 'MET DST' || $gmt == 'METDST')
         $gmt = '+0200';
      
      if (substr($gmt, 0, 1) == '-') {
         $neg = true;
         $gmt = substr($gmt, 1, strlen($gmt));
      } else if (substr($gmt, 0, 1) == '+') {
         $neg = false;
         $gmt = substr($gmt, 1, strlen($gmt));
      } else
         $neg = false;

      $gmt = substr($gmt, 0, 2);
      $gmt = $gmt * 3600;
      if ($neg == true)
         $gmt = "-$gmt";
      else
         $gmt = "+$gmt";

      /** now find what the server is at **/
      $current = date('Z', time());
      if ($invert_time)
          $current = - $current;
      $stamp = (int)$stamp - (int)$gmt + (int)$current;

      return $stamp;
   }

   /**
      Switch system has been intentionaly choosed for the 
      internationalization of month and day names. The reason
      is to make sure that _("") strings will go into the
      main po.
   **/

   function getDayName( $day_number ) {
   
      switch( $day_number ) {
      case 0:
         $ret = _("Sunday");
         break;
      case 1:
         $ret = _("Monday");
         break;
      case 2:
         $ret = _("Tuesday");
         break;
      case 3:
         $ret = _("Wednesday");
         break;
      case 4:
         $ret = _("Thursday");
         break;
      case 5:
         $ret = _("Friday");
         break;
      case 6:
         $ret = _("Saturday");
         break;
      default:
         $ret = '';
      }   
      return( $ret );
   }

   function getMonthName( $month_number ) {
      switch( $month_number ) {
         case '01':
            $ret = _("January");
            break;
         case '02':
            $ret = _("February");
            break;
         case '03':
            $ret = _("March");
            break;
         case '04':
            $ret = _("April");
            break;
         case '05':
            $ret = _("May");
            break;
         case '06':
            $ret = _("June");
            break;
         case '07':
            $ret = _("July");
            break;
         case '08':
            $ret = _("August");
            break;
         case '09':
            $ret = _("September");
            break;
         case '10':
            $ret = _("October");
            break;
         case '11':
            $ret = _("November");
            break;
         case '12':
            $ret = _("December");
            break;
         default:
            $ret = '';
      }
      return( $ret );
   }  

   function date_intl( $date_format, $stamp ) {

      $ret = str_replace( 'D', '$1', $date_format );
      $ret = str_replace( 'F', '$2', $ret );
      $ret = date( '$3'. $ret . '$3', $stamp ); // Workaround for a PHP 4.0.4 problem
      $ret = str_replace( '$1', substr( getDayName( date( 'w', $stamp ) ), 0, 3 ), $ret );
      $ret = str_replace( '$2', getMonthName( date( 'm', $stamp ) ), $ret );
      $ret = str_replace( '$3', '', $ret );
      
      return( $ret );
   }

   function getLongDateString( $stamp ) {
   
      return( date_intl( _("D, F j, Y g:i a"), $stamp ) );
      
   }

   function getDateString( $stamp ) {
   
      global $invert_time;

      $now = time();
      
      $dateZ = date('Z', $now );
      if ($invert_time)
          $dateZ = - $dateZ;
      $midnight = $now - ($now % 86400) - $dateZ;

      if ($midnight < $stamp) {
         // Today
         $date_format = _("g:i a");
      } else if ($midnight - 518400 < $stamp) {
         // This week
         $date_format = _("D, g:i a");
      } else {
         // before this week 
         $date_format = _("M j, Y");
      }
      
      return( date_intl( $date_format, $stamp ) );
      // return( date( $date_i, $stamp ) );
   }

   function getTimeStamp($dateParts) {
      /** $dateParts[0] == <day of week>   Mon, Tue, Wed
       ** $dateParts[1] == <day of month>  23
       ** $dateParts[2] == <month>         Jan, Feb, Mar
       ** $dateParts[3] == <year>          1999
       ** $dateParts[4] == <time>          18:54:23 (HH:MM:SS)
       ** $dateParts[5] == <from GMT>      +0100
       ** $dateParts[6] == <zone>          (EDT)
       **
       ** NOTE:  In RFC 822, it states that <day of week> is optional.
       **        In that case, dateParts[0] would be the <day of month>
       **        and everything would be bumped up one.
       **/

      // Simply check to see if the first element in the dateParts
      // array is an integer or not.
      //    Since the day of week is optional, this check is needed.  
      //    
      //    The old code used eregi('mon|tue|wed|thu|fri|sat|sun',
      //    $dateParts[0], $tmp) to find if the first element was the
      //    day of week or day of month. This is an expensive call
      //    (processing time) to have inside a loop. Doing it this way
      //    saves quite a bit of time for large mailboxes.
      //
      //    It is also quicker to call explode only once rather than
      //    the 3 times it was getting called by calling the functions
      //    getHour, getMinute, and getSecond.
      //
      if (! isset($dateParts[1])) $dateParts[1] = '';
      if (! isset($dateParts[2])) $dateParts[2] = '';
      if (! isset($dateParts[3])) $dateParts[3] = '';
      if (! isset($dateParts[4])) $dateParts[4] = '';
      if (! isset($dateParts[5])) $dateParts[5] = '';
      if (intval(trim($dateParts[0])) > 0) {
         $string = $dateParts[0] . ' ' . $dateParts[1] . ' ' . 
                   $dateParts[2] . ' ' . $dateParts[3];
         return getGMTSeconds(strtotime($string), $dateParts[4]);
      }
      $string = $dateParts[0] . ' ' . $dateParts[1] . ' ' .
                $dateParts[2] . ' ' . $dateParts[3] . ' ' . $dateParts[4];
     if (isset($dateParts[5]))
         return getGMTSeconds(strtotime($string), $dateParts[5]);
     else 
      return getGMTSeconds(strtotime($string), '');
   }

   // I use this function for profiling. Should never be called in
   // actual versions of squirrelmail released to public.
/*
   function getmicrotime() {
      $mtime = microtime();
      $mtime = explode(' ',$mtime);
      $mtime = $mtime[1] + $mtime[0];
      return ($mtime);
   }
*/
?>