How would one go about grouping by dates, i.e. month, year?

So a query from 12/30/2009 thru 1/2/2010 would have something similar to this.

Meter Day Month Year Barrels

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Meter1 12/30/09 Dec 2009 5

Meter1 12/31/09 Dec 2009 10

Meter1 DecTotal 2009 15

Meter1 2009Total 15

Meter2 1/1/10 Jan 2010 8

Meter2 1/2/10 Jan 2010 12

Meter2 JanTotal 2010 20

Meter2 2010Total 20