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Calculate a forward date from a given period

MGardner asked
Last Modified: 2013-11-28
I have a form with some machine service data on it that contains a couple of sub forms:-
a) tbl_Machinery_ServiceInterval with a couple of fields  LSperiod (Long Service Period) and SSperiod (Short Service Period) both showing a number representing a set monthly period for servicing.
b) SubServiceDetails1 with a couple of fields ServiceDate (Date last serviced) and ServiceType ( a combo box that shows if the entry is a Short Servic of a long service relating to the date.

I am trying to find a solution to devising a query that will show the next service date and the type of service is required?

I am assuming that if the short service period is 6 months and the long service period is 12 months and the last date was say 12/04/07 then there is only realy a need to calulate the forward date of the shortest service period but will need to determine if it is due a long service or a short service.

Any ideas how this can be acomplished??
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