HTML- PHP onClick Event Doesn't Work

Hi guys,

I'm using 'onClick' event in html & php but it doesn't work the way I need, actually, what I'm doing is a calendar so when people click on any day, the number of day is stored on a variable but when I echo the variable $diaseleccionado, always shows the last day, but not the day I clicked.

Please any ideas on this matter?

This is the part of code and it shows from day 1 to 31.

  //-------------------------------DIA 30 PARA DIBUJAR EL CALENDARIO
  if(substr("$dia30",0,1) == "N") {
    ?><TD height="30" ALIGN=center bgcolor="#666666">30</a></TD><?php
  }else{
    if(substr("$dia30",0,1) == "L") {
      ?><TD height="30" ALIGN=center bgcolor="#E1FFE1"><a href="#" onClick="<?php $diaseleccionado = 30; ?>">30</a></TD><?php
    }else{
      if(substr("$dia30",0,1) == "C") {
        $totalcitaxpordia = substr("$dia30",1);
        if ('$totalcitaxpordia' <= '$total_citas_por_dia') {
          ?><TD height="30" ALIGN=center bgcolor="#990000">30</a></TD><?php
        }else{
          ?><TD height="30" ALIGN=center bgcolor="#E1FFE1"><a href="#" onClick="<?php $diaseleccionado = 30; ?>">30</a></TD><?php
        }
      }
    }
  }
  //-------------------------------DIA 31 PARA DIBUJAR EL CALENDARIO
  if(substr("$dia31",0,1) == "N") {
    ?><TD height="30" ALIGN=center bgcolor="#666666">31</a></TD><?php
  }else{
    if(substr("$dia31",0,1) == "L") {
      ?><TD height="30" ALIGN=center bgcolor="#E1FFE1"><a href="#" onClick="<?php $diaseleccionado = 31; ?>">31</a></TD><?php
    }else{
      if(substr("$dia31",0,1) == "C") {
        $totalcitaxpordia = substr("$dia31",1);
        if ('$totalcitaxpordia' <= '$total_citas_por_dia') {
          ?><TD height="30" ALIGN=center bgcolor="#990000">31</a></TD><?php
        }else{
          ?><TD height="30" ALIGN=center bgcolor="#E1FFE1"><a href="#" onClick="<?php $diaseleccionado = 31; ?>">31</a></TD><?php
        }
      }
    }
  }
  ?> </TR>
  <TR> <?php
  ?> </TR>
</table> 
<table width="280" border="0" align="center">
  <tr>
    <td><div align="center">
      <input type="submit" name="Submit" value="Asignar horario">
    </div></td>
  </tr>
</table>
<?php
if(isset($_POST['Submit'])) {
echo "$diaseleccionado";
  ?>

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