include/chajian/dateChajian.php

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<?php 
class dateChajian extends Chajian
{
	public $now;
	public $date;
	
	protected function initChajian()
	{
		$this->now 		= $this->rock->now;
		$this->date 	= $this->rock->date;
	}

	public function formatdt($dt='',$format='Y-m-d H:i:s')
	{
		return date($format,strtotime($dt));
	}
	
	/**
		获取上月
	*/
	public function lastmonth($dt, $type='Y-m')
	{
		return $this->adddate($dt,'m',-1,$type);
	}

	/**
		计算时间间隔
	*/	
	public function datediff($type,$start,$end)
	{
		$time1 = strtotime($start);
		$time2 = strtotime($end);
		$val=0;
		switch($type){
			case 'Y'://年
				$Y1 = date('Y',$time1);
				$Y2 = date('Y',$time2);
				$val = $Y2 - $Y1;
			break;
			case 'm'://月份
				$y1 = date('Y',$time1);
				$y2 = date('Y',$time2);
				$m1 = date('m',$time1);
				$m2 = date('m',$time2);
				$y = $y1 - $y2;
				$mz = 0;
				if($y1 == $y2){
					$mz=$m2-$m1;
				}elseif($y1<$y2){
					$mz = 12-$m1+$m2+12*($y2-$y1-1);
				}else{
					$mz = -(12-$m2+$m1+12*($y1-$y2-1));
				}
				$val = $mz;
			break;
			case 'd'://日
				$dt1 = strtotime(date('Y-m-d',$time1));
				$dt2 = strtotime(date('Y-m-d',$time2));
				$time=$dt2-$dt1;
				$val = $time/3600/24;