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string date ( string format [, int timestamp] )     //ÆäÖÐtimestampΪ¿ÉÑ¡£¬Ä¬ÈÏֵΪtime();
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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