php date()函数说明
string date ( string format [, int timestamp] ) //其中timestamp为可选，默认值为time();
date("1"); //Monday
date("m.d.y"); //12.21.09
date("m.d.Y");//12.21.2009
$tomorrow = mktime(0, 0, 0, date("m") , date("d")+1, date("Y"));
$lastmonth = mktime(0, 0, 0, date("m")-1, date("d"), date("Y"));
$nextyear = mktime(0, 0, 0, date("m"), date("d"), date("Y")+1);
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2009-10-22 09:16
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