Combining non-matching date series in one chart
 

I am trying to combine two data ranges into a single line chart, but
the the X-values are not matching, although they are similar. I think
an example of my data explains my problem better

12/10/2006 4.3 12/10/2006 5.2
12/11/2006 4.4 12/11/2006 5.4
12/10/2006