PHP get time code summary sharing

This article mainly shares with you a summary of the PHP time acquisition code, hoping to give friends a deeper understanding and mastery of PHP time acquisition.

1. 上周特定周几
   ';
       echo date('Y-m-d',strtotime('-1 monday', $time));  
       echo '
   上周起始时间:
   ';  
       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 '
   本周起始时间:
   ';  
       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";  
     
      //从第几周找出该周的开始日期和结束日期  
       $dayNumber = date('W') * 7;  
       $weekDayNumber = date("w", mktime(0, 0, 0, 1, $dayNumber, date("Y")));//当前周的第几天  
       $startNumber = $dayNumber - $weekDayNumber;  
       echo date("Y-m-d", mktime(0, 0, 0, 1, $startNumber + 1, date("Y")));//开始日期  
       echo date("Y-m-d", mktime(0, 0, 0, 1, $startNumber + 7, date("Y")));//结束日期   
     
       echo '
   上月起始时间:
   ';  
       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 '
   本月起始时间:
   ';  
       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";  
      
       $season = ceil((date('n'))/3);//当月是第几季度  
       echo '
   本季度起始时间:
   ';  
       echo date('Y-m-d H:i:s', mktime(0, 0, 0,$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";  
      
       $season = ceil((date('n'))/3)-1;//上季度是第几季度  
       echo '
   上季度起始时间:
   ';  
       echo date('Y-m-d H:i:s', mktime(0, 0, 0,$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";  
   ?>

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