01    //php获取今日开始时间戳和结束时间戳
02    $beginToday=mktime(0,0,0,date('m'),date('d'),date('Y'));
03    $endToday=mktime(0,0,0,date('m'),date('d')+1,date('Y'))-1;
04    //php获取昨日起始时间戳和结束时间戳
05    $beginYesterday=mktime(0,0,0,date('m'),date('d')-1,date('Y'));
06    $endYesterday=mktime(0,0,0,date('m'),date('d'),date('Y'))-1;
07    //php获取上周起始时间戳和结束时间戳
08    $beginLastweek=mktime(0,0,0,date('m'),date('d')-date('w')+1-7,date('Y'));
09    $endLastweek=mktime(23,59,59,date('m'),date('d')-date('w')+7-7,date('Y'));
10    //php获取本月起始时间戳和结束时间戳
11    $beginThismonth=mktime(0,0,0,date('m'),1,date('Y'));
12    $endThismonth=mktime(23,59,59,date('m'),date('t'),date('Y'));

代码如下

switch ($exchange_time) {

    case 1 : // 本月

    // 本月起始时间:

    $begin_time = date ( "Y-m-d H:i:s", mktime ( 0, 0, 0, date ( "m" ), 1, date ( "Y" ) ) );

    $end_time = date ( "Y-m-d H:i:s", mktime ( 23, 59, 59, date ( "m" ), date ( "t" ), date ( "Y" ) ) );

    break;

    case 2 : // 上个月

    // 上个月的起始时间:

    $begin_time = date('Y-m-01 00:00:00',strtotime('-1 month'));

$end_time = date("Y-m-d 23:59:59", strtotime(-date('d').'day'));

    break;

    case 3 : // 上上个月

    $begin_time =  date("Y-m-d H:i:s",mktime(0, 0 , 0,date("m")-2,1,date("Y")));

    $end_time =  date("Y-m-d H:i:s",mktime(23,59,59,date("m")-1 ,0,date("Y")));

    break;

    }

    echodate("Ymd",strtotime("now"))," ";

    echodate("Ymd",strtotime("-1 week Monday"))," ";

    echodate("Ymd",strtotime("-1 week Sunday"))," ";

    echodate("Ymd",strtotime("+0 week Monday"))," ";

    echodate("Ymd",strtotime("+0 week Sunday"))," ";

    echo"*********第几个月:";

    echodate('n');

    echo"*********本周周几:";

    echodate("w");

    echo"*********本月天数:";

    echodate("t");

    echo"*********";

    echo'<br>上周起始时间:<br>';

    echodate("Y-m-d H:i:s",mktime(0, 0 , 0,date("m"),date("d")-date("w")+1-7,date("Y")))," ";

    echodate("Y-m-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7-7,date("Y")))," ";

    echo'<br>本周起始时间:<br>';

    echodate("Y-m-d H:i:s",mktime(0, 0 , 0,date("m"),date("d")-date("w")+1,date("Y")))," ";

    echodate("Y-m-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7,date("Y")))," ";

    echo'<br>上月起始时间:<br>';

    echodate("Y-m-d H:i:s",mktime(0, 0 , 0,date("m")-1,1,date("Y")))," ";

    echodate("Y-m-d H:i:s",mktime(23,59,59,date("m") ,0,date("Y")))," ";

    echo'<br>本月起始时间:<br>';

    echodate("Y-m-d H:i:s",mktime(0, 0 , 0,date("m"),1,date("Y")))," ";

    echodate("Y-m-d H:i:s",mktime(23,59,59,date("m"),date("t"),date("Y")))," ";

    $season= ceil((date('n'))/3);//当月是第几季度

    echo'<br>本季度起始时间:<br>';

    echodate('Y-m-d H:i:s',mktime(0, 0, 0,$season*3-3+1,1,date('Y')))," ";

    echodate('Y-m-d H:i:s',mktime(23,59,59,$season*3,date('t',mktime(0, 0 , 0,$season*3,1,date("Y"))),date('Y')))," ";

    $season= ceil((date('n'))/3)-1;//上季度是第几季度

    echo'<br>上季度起始时间:<br>';

    echodate('Y-m-d H:i:s',mktime(0, 0, 0,$season*3-3+1,1,date('Y')))," ";

    echodate('Y-m-d H:i:s',mktime(23,59,59,$season*3,date('t',mktime(0, 0 , 0,$seas））

本人自己总结    获取   月初和月末时间   

$y = date('Y',time());
        $m = date('m',time());

        $t1 = strtotime($y.'-'.$m.'-1 00:00:00');//本月初   获取时间戳
        //$t2 = strtotime(date('Y-m-t'));//获取本月末  方法2
        $t2 = strtotime($y.'-'.($m).'-'.date('t'));//本月末

        $time1=date('Y-m-d',$t1);//把本月初时间戳   换成ymd格式
        $time2=date('Y-m-d',$t2);//把本月末时间戳   换成ymd格式
        $time_where = "between '".$time1."' and  '".$time2."' group by add_yy.id";