CSS浮动无法保持外部块元素的大小正确

<ul class="blogEntry">
    <li class="title section">
        <span><asp:Literal ID="litTitle" runat="server" /></span>
        <span class="date"><asp:Literal ID="litDate" runat="server" Text="10/1/1000" /></span>
    </li>
    <li class="body section"><asp:Literal ID="litBody" runat="server" /></li>
    <li class="tags section">
        <ul class="tags">
            <li class="tag">Tag 1</li>
            <li class="tag">Tag 2</li>
            <li class="tag">Tag 3</li>
        </ul>
    </li>
</ul>

ul.blogEntry
{
    border: 1px solid black;
    border-bottom: 0px;
    padding: 0px;
}
ul.blogEntry li.section, ul.blogEntry li.lastsection
{
    list-style: none;
}
ul.blogEntry li.title
{
    background-color: #67A7FF;
    font-size: 14px;
    font-weight: bold;
}
ul.blogEntry li.title span
{
    display: inline;
}
ul.blogEntry li.title.section span.date
{
    float: right;
}
ul.blogEntry li.section
{
    padding: 4px;
    border-bottom: 1px solid black;
}

按原样,日期将下降到新行并向右浮动。如果我改变主意 ul.blogEntry li.title span CSS和添加浮点:左;外部LI元素的高度缩小,底部边框正好穿过跨度的文本。建议?