用php获取本周,上周,本月,上月,本季度日期

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 '<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 '<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 '<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-d H:i:s",mktime(23,59,59,date("m"),date("t"),date("Y"))),"\n";  

$getMonthDays = date("t",mktime(0, 0 , 0,date('n')+(date('n')-1)%3,1,date("Y")));//本季度未最后一月天数  
echo '<br>本季度:<br>';  
echo date('Y-m-d H:i:s', mktime(0, 0, 0,date('n')-(date('n')-1)%3,1,date('Y'))),"\n";  
echo date('Y-m-d H:i:s', mktime(23,59,59,date('n')+(date('n')-1)%3,$getMonthDays,date('Y'))),"\n";  echo '<br>3年后:<br>';
echo date("Y-m-d",strtotime("+3 year ")), "\n"; echo date("Y-m-d",strtotime("2010-3-1 +3 year ")), "\n"; 

from:http://blog.csdn.net/mlks_2008/archive/2009/08/05/4411053.aspx