Summarise dates into months

Hi, I have transactional data that I can display on my report on a day by day basis eg:/

01/01/01 2353.45

02/01/01 1458.54

03/01/01 4584.32

I would like to display monthly totals on the report like such

Jan 01 52000.00

Feb 01 45858.44

Mar 01 54488.44

What is the easiest way to do this, is it a universe design solution or a webi function?