Try this setting in a column in the query grid.
Field: IIf(Day(Date())<28 And Month(Date())=1,[DeliveryDate] Between DateSerial(Year(Date())-1,12,27) And DateSerial(Year(Date()),1,26),IIf(Day(Date())<28,[DeliveryDate] Between DateSerial(Year(Date()),Month(Date())-1,27) And...