squirrelmail/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
    **
    **/

   $date_php = true;

   // corrects a time stamp to be the local time
   function getGMTSeconds($stamp, $gmt) {
      if (($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) {
      $now = time();
      $dateZ = date("Z", $now);
      if ($invert_time)
          $dateZ = - $dateZ;
      $midnight = $now - ($now % 86400) - 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] . " " . $dateParts[4];
      return getGMTSeconds(strtotime($string), $dateParts[5]);
   }

   // 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);
   }
?>