> Hi
>
> i do not follow suggestions by others how to solve problem with udf
> but what functions do you need?
> I ask because many functions are present now in Firebird 2.1.x itself.
> look into C:\Program Files\Firebird\Firebird_2_1\doc\sql.extensions\README.builtin_functions.txt
>
> Your sample try to add month.
> use built in function insteed of F_AddMonth
> DATEADD(10 MONTH TO MY_DATE) ..
>
> Karol Bieniaszewski

Karol, that was exactly what I needed. I just switched from 2.0 to 2.1. I can see that I need to read documentation more often. Your suggestion to use DATEADD worked perfectly. Thank you so much for taking the time to help.

I don't know what the problem was with the external functions, but now that 2.1 has so many native ones, I may not need an external library. Thanks again.