Ta aí uma classe pra gerar um calendário...

Informando a classe CSS fica bem bonitinho x). Classe de minha autoria.

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<?php
   error_reporting(E_ALL);
   class Calendario {
      private $_dia;
      private $_mes;
      private $_ano;
      private $_class;
      private $_ts = 0;

      public function __construct($data=0, $class="") {
         if ($data == 0) {
            $this->_dia = date("d");
            $this->_mes = date("m");
            $this->_ano = date("Y");
         } else {
            $tmp = explode("/", $data);
            $this->_dia = $tmp[0];
            $this->_mes = $tmp[1];
            $this->_ano = $tmp[2];
         }
         $this->_class = $class;
      } // __construct

      public function __show() {
         printf("<table class=\"%s\" width=\"%s\" height=\"%s\">\n", $this->_class, "100%", "100%");
         $this->__openWeek();
         $this->__printHeader();
         $this->__closeWeek();

         $first = true;
         $numDay = 0;
         $day = $this->__calcNextDate();
         while ($day) {
            if ($numDay == 7) {
               $this->__closeWeek();
               $numDay = 0;
            }
            if ($numDay == 0) {
               $this->__openWeek();
               if ($first) {
                  $numDay = date("w", $this->_ts);
                  $first = false;
                  for ($x = 0; $x<$numDay; $x++) {
                     $this->__addDay(" ");
                  }
               }
            }
            $this->__addDay($day);
            $day = $this->__calcNextDate();
            $numDay++;
         }
         while ($numDay < 7) {
            $this->__addDay(" ");
            $numDay++;
         }
         $this->__closeWeek();
         printf("</table>\n");
      } // __show

      private function __calcNextDate() {
         if ($this->_ts == 0) {
            $ts = mktime(0, 0, 0, $this->_mes, 1, $this->_ano);
         } else {
            $tmp = date("d-m-Y", $this->_ts);
            $tmp = explode("-", $tmp);
            $ts = mktime(0, 0, 0, $tmp[1], ($tmp[0]+1), $tmp[2]);
         }
         $this->_ts = $ts;
         if (date("m",$ts) != $this->_mes) {
            return false;
         } else {
            return date("d", $ts);
         }
      } // __ calcNextDate

      private function __openWeek() {
         printf("<tr class=\"%s\">\n", $this->_class);
      } // __openWeek

      private function __closeWeek() {
         printf("</tr>\n");
      } // __closeWeek

      private function __addDay($day) {
         if ($day == $this->_dia) {
            $class = $this->_class."1";
         } else {
            $class = $this->_class;
         }
         printf("<td class=\"%s\">\n", $class);
         printf("%s\n", $day);
         printf("</td>\n");
      } // __addDay

      private function __printHeader() {
         printf("<th class=\"%s\">\n", $this->_class);
         printf("DOM\n");
         printf("</th>\n");

         printf("<th class=\"%s\">\n", $this->_class);
                        printf("SEG\n");
                        printf("</th>\n");

         printf("<th class=\"%s\">\n", $this->_class);
                        printf("TER\n");
                        printf("</th>\n");

         printf("<th class=\"%s\">\n", $this->_class);
                        printf("QUA\n");
                        printf("</th>\n");
         
         printf("<th class=\"%s\">\n", $this->_class);
         printf("QUI\n");
         printf("</th>\n");

         printf("<th class=\"%s\">\n", $this->_class);
         printf("SEX\n");
         printf("</th>\n");

         printf("<th class=\"%s\">\n", $this->_class);
         printf("SAB\n");
         printf("</th>\n");
      }
   };
?>

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