Use php to get code examples for this week, last week, this month, last month, and this quarter's dates

Use php to get the codes for the dates of this week, last week, this month, last month, and this quarter, and use the method to get various dates.

The code is as follows:

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"; 


//date('n') 第几个月 
//date("w") 本周周几 
//date("t") 本月天数 

echo &#39;<br>上周:<br>&#39;; 
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 &#39;<br>本周:<br>&#39;; 
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 &#39;<br>上月:<br>&#39;; 
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 &#39;<br>本月:<br>&#39;; 
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"; 

$getMonthDays = date("t",mktime(0, 0 , 0,date(&#39;n&#39;)+(date(&#39;n&#39;)-1)%3,1,date("Y")));//本季度未最后一月天数 
echo &#39;<br>本季度:<br>&#39;; 
echo date(&#39;Y-m-d H:i:s&#39;, mktime(0, 0, 0,date(&#39;n&#39;)-(date(&#39;n&#39;)-1)%3,1,date(&#39;Y&#39;))),"\n"; 
echo date(&#39;Y-m-d H:i:s&#39;, mktime(23,59,59,date(&#39;n&#39;)+(date(&#39;n&#39;)-1)%3,$getMonthDays,date(&#39;Y&#39;))),"\n";

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