SELECT *
FROM tblTest
WHERE tblTest.tstDate>=DateSerial(Year(DateAdd("m",1,Now)),Month(DateAdd("m",1,Now)),1)
AND tblTest.tstDate<DateSerial(Year(DateAdd("m",2,Now)),Month(DateAdd("m",2,Now)),1);
SELECT * FROM yourtableName
WHERE NextMaint BETWEEN DATEVALUE(Now()) AND DATEVALUE(DATEADD( "m",1, Now()))
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