function time_tran($the_time){
$now_time = date("Y-m-d H:i:s",time()+8*60*60);
$now_time = strtotime($now_time);
$show_time = strtotime($the_time);
$dur = $now_time - $show_time;
if($dur < 0){
return $the_time;
}else{
if($dur < 60){
return $dur.'秒前';
}else{
if($dur < 3600){
return floor($dur/60).'分钟前';
}else{
if($dur < 86400){
return floor($dur/3600).'小时前';
}else{
if($dur < 259200){//3天内
return floor($dur/86400).'天前';
}else{
return $the_time;
}
}
}

PHP
function format_date($time){
$t=time()-$time;
$f=array(
'31536000'=>'年',
'2592000'=>'个月',
'604800'=>'星期',
'86400'=>'天',
'3600'=>'小时',
'60'=>'分钟',
'1'=>'秒'
);
foreach ($f as $k=>$v) {
if (0 !=$c=floor($t/(int)$k)) {
return $c.$v.'前';
}
}
}
?>

function formatTime($date) {
$str = '';
$timer = strtotime($date);
$diff = $_SERVER['REQUEST_TIME'] - $timer;
$day = floor($diff / 86400);
$free = $diff % 86400;
if($day > 0) {
return $day."天前";
}else{
if($free>0){
$hour = floor($free / 3600);
$free = $free % 3600;
if($hour>0){
return $hour."小时前";
}else{
if($free>0){
$min = floor($free / 60);
$free = $free % 60;
if($min>0){
return $min."分钟前";
}else{
if($free>0){
return $free."秒前";
}else{
return '刚刚';
}
}
}else{
return '刚刚';
}
}
}else{
return '刚刚';
}
}
}

function time_tran($the_time){
$now_time = date("Y-m-d H:i:s",time()+8*60*60);
$now_time = strtotime($now_time);
$show_time = strtotime($the_time);
$dur = $now_time - $show_time;
if($dur < 0){
return $the_time;
}else{
if($dur < 60){
return $dur.'秒前';
}else{
if($dur < 3600){
return floor($dur/60).'分钟前';
}else{
if($dur < 86400){
return floor($dur/3600).'小时前';
}else{
if($dur < 259200){//3天内
return floor($dur/86400).'天前';
}else{
return $the_time;
}
}
}
}
}
}

PHP
/*
* author: Solon Ring
* time: 2011-11-02
* 发博时间计算(年，月，日，时，分，秒)
* $createtime 可以是当前时间
* $gettime 你要传进来的时间
*/

class Mygettime{

function __construct($createtime,$gettime) {
$this->createtime = $createtime;
$this->gettime = $gettime;
}

function getSeconds()
{
return $this->createtime-$this->gettime;
}

function getMinutes()
{
return ($this->createtime-$this->gettime)/(60);
}

function getHours()
{
return ($this->createtime-$this->gettime)/(60*60);
}

function getDay()
{
return ($this->createtime-$this->gettime)/(60*60*24);
}

function getMonth()
{
return ($this->createtime-$this->gettime)/(60*60*24*30);
}

function getYear()
{
return ($this->createtime-$this->gettime)/(60*60*24*30*12);
}

function index()
{
if($this->getYear() > 1)
{
if($this->getYear() > 2)
{
return date("Y-m-d",$this->gettime);
exit();
}
return intval($this->getYear())." 年前";
exit();
}

if($this->getMonth() > 1)
{
return intval($this->getMonth())." 月前";
exit();
}

if($this->getDay() > 1)
{
return intval($this->getDay())." 天前";
exit();
}

if($this->getHours() > 1)
{
return intval($this->getHours())." 小时前";
exit();
}

if($this->getMinutes() > 1)
{
return intval($this->getMinutes())." 分钟前";
exit();
}

if($this->getSeconds() > 1)
{
return intval($this->getSeconds()-1)." 秒前";
exit();
}

}

}
//类的使用实例
/*
*
* 调用类输出方式
*
* $a = new Mygettime(time(),strtotime('-25 month'));
* echo iconv('utf-8','gb2312',$a->index())?iconv('utf-8',$a->index()):iconv('utf-8','当前');
*
*/