I have just worked out how to do it - so in case anyone else is having
similar problem - In the Axis options change the Minimum and Maximum to Fixed
and change the number (the sequencial date conversion number) by adding 21 to
the minimum and taking 21 off at the maximum values. This has the effect of
moving the start day forward by 21 days and reducing the end date by 21.

"Thermal Man" wrote:

I am using a simple chart to plot a range of values against weekly dates
(Monday 5/01/2009 to Monday 28/12/2009) Excel inserts 3 dates before and
after my date range - how can I force the graph to only display the dates
within the data range?