<?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>上周起始时间:<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-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7-7,date("Y"))),"\\n";      echo '<br>本周起始时间:<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-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7,date("Y"))),"\\n";          echo '<br>上月起始时间:<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>本月起始时间:<br>';      echo date("Y-m-d H:i:s",mktime(0, 0 , 0,date("m"),1,date("Y"))),"\\n";      echo date("Y-m-d H:i:s",mktime(23,59,59,date("m"),date("t"),date("Y"))),"\\n";          $season = ceil((date('n'))/3);//当月是第几季度      echo '<br>本季度起始时间:<br>';      echo date('Y-m-d H:i:s', mktime(0, 0, 0,$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";          $season = ceil((date('n'))/3)-1;//上季度是第几季度      echo '<br>上季度起始时间:<br>';      echo date('Y-m-d H:i:s', mktime(0, 0, 0,$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";  ?>