php 得到上周，本周，上月，本月，本季度，上季度

<?php

echo date("Ymd",strtotime("now")), "\n";

echo date("Ymd",strtotime("-1 week Monday")), "\n";

echo date("Ymd",strtotime("-1 week Sunday")), "\n";

echo date("Ymd",strtotime("+0 week Monday")), "\n";

echo date("Ymd",strtotime("+0 week Sunday")), "\n";

echo "*********第几个月:";

echo date('n');

echo "*********本周周几:";

echo date("w");

echo "*********本月天数:";

echo date("t");

echo "*********";

echo'<br>上周:<br>';

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

echo date("Y-m-dH:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7-7,date("Y"))),"\n";

echo'<br>本周:<br>';

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

echo date("Y-m-dH:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7,date("Y"))),"\n";

echo'<br>上月:<br>';

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

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

echo'<br>本月:<br>';

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

echo date("Y-m-dH:i:s",mktime(23,59,59,date("m"),date("t"),date("Y"))),"\n";

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

echo'<br>本季度:<br>';

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

echo date('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'))),"\n";

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

echo'<br>上季度:<br>';

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

echo date('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'))),"\n";

?>

php两个日期相减得天数

<?php

function count_days($a,$b){

$a_dt=getdate($a);

$b_dt=getdate($b);

$a_new=mktime(12,0,0,$a_dt['mon'],$a_dt['mday'],$a_dt['year']);

$b_new=mktime(12,0,0,$b_dt['mon'],$b_dt['mday'],$b_dt['year']);

return round(abs($a_new-$b_new)/3600/24);

}

functioncount_days($formdate,$todate){

returnround(abs(strtotime($formdate)-strtotime($todate))/3600/24);

}