function setDateStyle(id)
{
	document.getElementById(id).childNodes(1).style.cssText= "height:22px;width:11em; line-height:22px; border:1px solid #779a11; padding-left:3px; background-color:#fff;";
}


dojo.addOnLoad(function(){
		setDateStyle("issueDate");
});

<s:datetimepicker id="issueDate" name="issueDate"   displayFormat="yyyy-MM-dd" />