php日期处理代码

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<?php
 
echo "<pre>";
echo date("Y-m-d",strtotime("now")), "\n";
echo "<pre>";
echo date("Y-m-d",strtotime("-1 week Monday")), "\n";
echo "<pre>";
echo date("Y-m-d",strtotime("-1 week Sunday")), "\n";
echo "<pre>";
echo date("Y-m-d",strtotime("+0 week Monday")), "\n";
echo "<pre>";
echo date("Y-m-d",strtotime("+0 week Sunday")), "\n";
echo "<pre>";
 
echo "*********第几个月:";
echo date('n'); 
echo "<pre>";
echo "*********本周周几:";
echo date("w"); 
echo "<pre>";
echo "*********本月天数:";
echo date("t");
 
echo "<pre>";
 
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-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7-7,date("Y"))),"\n";
echo "<pre>";
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-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7,date("Y"))),"\n";
echo "<pre>";
echo '<br>上上月:<br>';
echo date("Y-m-d H:i:s",mktime(0, 0 , 0,date("m")-2,1,date("Y"))),"\n";
echo date("Y-m-d H:i:s",mktime(23,59,59,date("m")-1,0,date("Y"))),"\n";
echo "<pre>";
 
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 "<pre>";
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-d H:i:s",mktime(23,59,59,date("m"),date("t"),date("Y"))),"\n";
echo "<pre>";
  
echo "<pre>";
$season = ceil((date('n'))/3)-2;//上季度是第几季度
echo '<br>上上季度:<br>';
echo date('Y-m-d H:i:s', mktime(0, 0, 0,$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"; 
 echo "<pre>";
  
echo "<pre>";
$season = ceil((date('n'))/3)-1;//上季度是第几季度
echo '<br>上季度:<br>';
echo date('Y-m-d H:i:s', mktime(0, 0, 0,$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"; 
 echo "<pre>";
 
echo $season = ceil((date('n'))/3);//当月是第几季度
echo '<br>本季度:<br>';
echo date('Y-m-d H:i:s', mktime(0, 0, 0,$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";
  
$season = ceil((date('n'))/3)+1;//当月是第几季度
echo '<br>下季度:<br>';
echo date('Y-m-d H:i:s', mktime(0, 0, 0,$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";
  
echo "<pre>";
 
?>