Sure there is. What I'd do is create a series like this:

X Y
A1: 1/1/2007 0 <~~~or whatever your minimum value is for the chart
A2: =date(year(a1),month(A1)+1,day(a1)) 0

COPY DOWN

Create another series for your chart using these values.
Put Y error bars on the series at the size you need.

Use something like Rob Bovey's XYChart Labeler (www.appspro.com) to put
labels on this series. You labels could be the X part of your series.

Change the series marker to none.

It's kludgy, but it works.


"Rab" wrote:

I'm plotting a number of data series on an x-y scatter chart. Values are
recorded daily over an 18 month period and are plotted against time on the
x-axis. To make the graph look neat I want to place tick marks at monthly
intervals at the first of each month. Because the number of days in the
month varies it is not possible to select an appropriate major unit in the
format axis box. As a result, if I select for example 31 as the major unit
then the monthly tick marks progressively move to a later date in the month -
starting from 01 August 05 and by March 07 my tick mark is placed at the
13th. Is there anyway to overcome this? Thanks.