date_utils.inc

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<?php
/**************************************************************
 
 Copyright (c) 2007-2010 Sonjara, Inc
 
 Permission is hereby granted, free of charge, to any person
 obtaining a copy of this software and associated documentation
 files (the "Software"), to deal in the Software without
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 without prior written authorization.
 
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 HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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*****************************************************************/
 
class DateUtils
{
     function DateUtils()
     {
          
     }
     
     static function getMonthDays($m, $y)
     {
          $monthDays = array(31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
          $d = $monthDays[$m - 1];
          if ($m == 2 && ($y % 4) == 0 && ($y % 100) != 0) $d++;
     
          return $d;
     }
     
 
     static function getMonthWeekDays($month, $year)
     {
          $weekDaysInMonth = array
          (
               28   =>   array(20, 20, 20, 20, 20, 20, 20),
               29   =>   array(21, 21, 21, 21, 21, 20, 20),
               30   =>   array(22, 22, 22, 22, 21, 20, 21),
               31   =>   array(23, 23, 23, 22, 21, 21, 22)
          );
     
          $days = getMonthDays($month, $year);
          $date = strtotime("$year-$month-01");
     
          $first = date("N", $date) - 1;
          return $weekDaysInMonth[$days][$first];
     }    
     
     /*
     * If start and end dates are the same date 
     * then show the date followed by start and end time.
     * Otherwise, show start date and time to end date
     * and time. 
     * 
     * $start - datetime
     * $end - datetime
     */
     static function formatStartDateToEndDate($start, $end)
     {
          $yyyy = substr($start,0,4);
          $yyyy_2 = substr($end,0,4);
          $mm   = substr($start,5,2);
          $mm_2   = substr($end,5,2);
          $dd   = substr($start,8,2);
          $dd_2   = substr($end,8,2);
               
          if($yyyy != $yyyy_2 || $mm != $mm_2 || $dd != $dd_2)
          {
               return formatDateTime12Hr($start) ." &ndash; ". formatDateTime12Hr($end);
          }
          else
          {
               $hh   = substr($start,11,2);
               $mi   = substr($start,14,2);
               $hh_2   = substr($end,11,2);
               $mi_2   = substr($end,14,2);
               $s_time = date("g:ia", mktime($hh,$mi));
               $e_time = date("g:ia", mktime($hh_2,$mi_2));
               return formatDateShort($start) . " $s_time &ndash; $e_time";
          }    
     }
     
     static function addMonths(&$date, $months)
     {
        $init = clone $date;
        $modifier = $months.' months';
        $back_modifier = -$months.' months';
       
        $date->modify($modifier);
        $back_to_init = clone $date;
        $back_to_init->modify($back_modifier);
       
        while($init->format('m') != $back_to_init->format('m'))
        {
          $date->modify('-1 day');
          $back_to_init = clone $date;
          $back_to_init->modify($back_modifier);   
          }
     }
     
    static function addYears(&$date, $years)
    {   
        $init = clone $date;
        $modifier = $years.' years';
        $date->modify($modifier);
       
        while($date->format('m')!=$init->format('m'))
        {
          $date->modify('-1 day');
        }
    }     
    
    static function fuzzyDate($date)
    {
     $time = strtotime($date);
     $now = time();
     $ago = $now - $time;
     if ($ago < 60)
     {
          $when = round($ago);
          $s = ($when == 1)?"second":"seconds";
          return "$when $s ago";
     }
     else if ($ago < 3600)
     {
          $when = round($ago / 60);
          $m = ($when == 1)?"minute":"minutes";
          return "$when $m ago";
     }
     else if ($ago >= 3600 && $ago < 86400)
     {
              $when = round($ago / 60 / 60);
              $h = ($when == 1)?"hour":"hours";
              return "$when $h ago";
     }
     else if ($ago >= 86400 && $ago < 2629743.83)
     {
              $when = round($ago / 60 / 60 / 24);
              $d = ($when == 1)?"day":"days";
              return "$when $d ago";
     }
     else if ($ago >= 2629743.83 && $ago < 31556926)
     {
              $when = round($ago / 60 / 60 / 24 / 30.4375);
              $m = ($when == 1)?"month":"months";
              return "$when $m ago";
     }
     else
     {
              $when = round($ago / 60 / 60 / 24 / 365);
              $y = ($when == 1)?"year":"years";
              return "$when $y ago";
     }
    }
    
    static function getMonths()
    {
     $months = array();
     for($i = 1; $i < 13; ++$i)
     {
          $months[$i] = date("F", mktime(0, 0, 0, $i, 10));
     }
     return $months;
    }
}