Aggregating fields based on datetime month and day

Dear all,

I would like to create a monthly and daily queries to aggregate fields, i.e. buildingcost, numberMonths for buildDateTime.

i.e. Montly Aggregate

buildDateTime            buildingcost
01/01/2004 00:00:00  9
02/01/2004 00:00:00  10

Returning:

buildDateTime  buildingcost
01/2004             19

etc.

I've tried the following without success:

SELECT table1.buildDateTime, SUM(table1.buildingcost), SUM(table1.numberMonths
FROM buildDateTime
WHERE (table1.buildDateTime>= #01/01/2002 00:00:00# AND table1.buildDateTime< #01/12/2002 00:00:00#)
GROUP BY table1.buildDateTime; // how do I specify the month and year

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Thanks