You can specify a Period type as a parameter or return type for UDFs written in C, C++, or Java. This includes scalar and aggregate UDFs, table functions, and table operators.
You can specify a Period type as an IN, INOUT, or OUT parameter of stored procedures and external stored procedures written in C, C++, or Java.
You can specify a Period type as a parameter or return type for UDMs written in C or C++.
FNC functions and Java classes and methods are provided to enable a UDF, UDM, or external stored procedure to access and set the value of a Period parameter, or to get information about the Period type parameter.