php 日期格式化

       date('Y-m-d H:i:s',time());  2014-09-01 05:06:01
       date(' y-n-j G:i:s',time());　 14-9-1 5:06:01

mktime(hour,minute,second,month,day,year,is_dst)

echo date("Y-m-d H:i:s",mktime(15,26,51,12,3,2001));
2001-12-03 15:26:51


$time = strtotime("2010-09-08 07:06:05");
echo date("Y-m-d H:i:s",$time);
2010-09-08 07:06:05