phase 1 of interface improvements -- alternating row colors (needs some work)

[squirrelmail.git] / functions / date.php

<?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
    **
    **  $Id$
    **/

   $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 == '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;
   }

   function getLongDateString($stamp) {
      return date('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
         return date('g:i a', $stamp);
      } else if ($midnight - (60 * 60 * 24 * 6) < $stamp) {
         // This week
         return date('D, g:i a', $stamp);
      } else {
         // before this week 
         return date('M j, Y', $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], $tmp) to find if the first element was the
      //    day of week or day of month. This is an expensive call
      //    (processing time) to have inside a loop. Doing it this way
      //    saves quite a bit of time for large mailboxes.
      //
      //    It is also quicker to call explode only once rather than
      //    the 3 times it was getting called by calling the functions
      //    getHour, getMinute, and getSecond.
      //
      if (intval(trim($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);
   }
?>