Question on Dashboards


I am trying to create a graph on my dashboard that shows a month by month historical trend line graph. When I try and graph out the info it sorts the months by alphabetical order rather than in the correct order. I have 2 columns on my source sheet pulled into a report one that shows the date an item was entered and I have a formula for another column to convert that date to a month only. Any advice on how to do this would be great.