[html] How to align this span to the right of the div?

I have the following HTML:

<div class="title">
    <span>Cumulative performance</span>
    <span>20/02/2011</span>
</div>

with this CSS:

.title
{
    display: block;
    border-top: 4px solid #a7a59b;
    background-color: #f6e9d9;
    height: 22px;
    line-height: 22px;
    padding: 4px 6px;
    font-size: 14px;
    color: #000;
    margin-bottom: 13px;
    clear:both;
}

If you check this jsFiddle: http://jsfiddle.net/8JwhZ/

you can see that the Name & Date are stuck together. Is there a way that I can get the date to align to the right? I've tried float: right; on the second <span> but it screws up the style, and pushes the date outside of the enclosing div

An alternative solution to floats is to use absolute positioning:

.title {
  position: relative;
}

.title span:last-child {
  position: absolute;
  right: 6px;   /* must be equal to parent's right padding */
}

See also the fiddle.

The solution using flexbox without justify-content: space-between.

<div class="title">
  <span>Cumulative performance</span>
  <span>20/02/2011</span>
</div>

.title {
  display: flex;
}

span:first-of-type {
  flex: 1;
}

When we use flex:1 on the first <span>, it takes up the entire remaining space and moves the second <span> to the right. The Fiddle with this solution: https://jsfiddle.net/2k1vryn7/

Here https://jsfiddle.net/7wvx2uLp/3/ you can see the difference between two flexbox approaches: flexbox with justify-content: space-between and flexbox with flex:1 on the first <span>.

You can do this without modifying the html. http://jsfiddle.net/8JwhZ/1085/

<div class="title">
<span>Cumulative performance</span>
<span>20/02/2011</span>
</div>

.title span:nth-of-type(1) { float:right }
.title span:nth-of-type(2) { float:left }

Working with floats is bit messy:

This as many other 'trivial' layout tricks can be done with flexbox.

   div.container {
     display: flex;
     justify-content: space-between;
   }

In 2017 I think this is preferred solution (over float) if you don't have to support legacy browsers: https://caniuse.com/#feat=flexbox

Check fiddle how different float usages compares to flexbox ("may include some competing answers"): https://jsfiddle.net/b244s19k/25/. If you still need to stick with float I recommended third version of course.