shaiss,
I think using <table> selectors is the way to go.
In my opinion, your app is displaying tabular data.  Therefore, I think "In" and "Day/Week" should be column headers.  Use <th></th> instead of a <td></td> to define header cells.  You need to wrap <th> in <tr></tr> and <thead> and <tbody> are optional:
<table>
  <thead>
    <tr><td>col1</td><td>col2</td></tr>
  </thead>
  <tbody>
    <tr><td>data1</td><td>data2</td></tr>
  </tbody>
</table>
Then you can position the <th> with the "In" like so:
thead th.left
{
  text-align: left;
}
Full source code here:
http://jsfiddle.net/g3MKj/
Of course, something like Jan Aagaard's code could work for you.  But just for the sake of learning, another way to accomplish the same thing in CSS is:
span.absolute-right
{
    position:absolute;
    right:0;
    margin-right:10px;
}
HTML:
<span>In</span>
<span class="absolute-right">Day/Week</span>
I have this example, and Jan Aagaard's, plus another example using position:relative here: http://jsfiddle.net/L7fTp/