I have many <a> tag like buttons with content date inside the form, when I do post how I will get the data who stored on the <a> tag?

Example:

<form id="formOs" action="jsOS.php" method="post" rel="external">

<a style="height:60px; line-height: 40px;" href="#" id="diaSelecionado" data-role="button" data-inline="false"> 19/11/2012 

</a>

</form>