计算两个日期相差年月日

/** 
 +---------------------------------------------------------- 
 * 功能：计算两个日期相差 年 月 日 
 +---------------------------------------------------------- 
 * @param date   $date1 起始日期 
 * @param date   $date2 截止日期日期 
 +---------------------------------------------------------- 
 * @return array       
 +---------------------------------------------------------- 
 */
function DiffDate($date1, $date2) { 
  if (strtotime($date1) > strtotime($date2)) { 
    $ymd = $date2; 
    $date2 = $date1; 
    $date1 = $ymd; 
  } 
  list($y1, $m1, $d1) = explode('-', $date1); 
  list($y2, $m2, $d2) = explode('-', $date2); 
  $y = $m = $d = $_m = 0; 
  $math = ($y2 - $y1) * 12 + $m2 - $m1; 
  $y = floor($math / 12); 
  $m = intval($math % 12); 
  $d = (mktime(0, 0, 0, $m2, $d2, $y2) - mktime(0, 0, 0, $m2, $d1, $y2)) / 86400; 
  if ($d < 0) { 
    $m -= 1; 
    $d += date('j', mktime(0, 0, 0, $m2, 0, $y2)); 
  } 
  $m < 0 && $y -= 1; 
  return array($y, $m, $d); 
}

<?php  
  //Get detail gap of year,month and days between two different time by vfhky 20130728  
  $common = (time()-strtotime(get_option('swt_builddate')));  
  $a = floor($common/86400/360);    //整数年  
  $b = floor($common/86400/30) - $a*12; //整数月  
  $c = floor($common/86400) - $a*360 - $b*30;   //整数日  
  $d = floor($common/86400);    //总的天数  
  echo $a."年".$b."月".$c."日（共计".$d."天）";  
?>