获取指定月份月初，月末时间

$day=date("Y-m-d",time());

$day ="28-03-2015";

$day =date("Y-M-d",strtotime($day));

var_dump(time());

var_dump($day);

$day2 = date("Y-m",strtotime($day));

$day3 = strtotime($day2);

var_dump($day3);

var_dump("Y-m-d",$day3);

var_dump(date("Y-m-01 00:00:00",$day3));

var_dump(strtotime(date("Y-m-01 00:00:00",time()))); 月初时间。

var_dump($day2);

var_dump(mktime(23, 59, 59, date('m', strtotime($day))+1, 00));

var_dump(date("Y-m-d H-i-s",mktime(23, 59, 59, date('m', strtotime($day))+1, 00)));exit;//月末时间