I have a spreadsheet full of charts based on monthly data. The charts
are intended to show a year's worth of information, i.e., April 2009
to March 2010. There are a series of cells in the spreadsheet with the
chart that are autoupdated with new information that the charts are
based on.

Since there are so many of these charts to update each month, I'd like
to know if there is a way to have them automatically shift their date
ranges for each new month. For example, Chart A shows data from April
2009 to March 2010. Now that April is here, the chart needs to be
shifted to show data from May 2009 to April 2010. Is there a way to
accomplish this without having to manually update each chart?