In article <3EC912B5.16861.1E55284@localhost>, Dimitry Sibiryakov wrote:

> >gratefull thanks to anyone who can tell me why
>
> I don't know what is wrong with your udf, but... have you ever
> heard about built-in function EXTRACT() and it's parameter WEEKDAY?

It was not available in version 4 and I'm currently migrating a version 4
database to fb. I shall then look at what I can change to use built-in
functionality

--
Nick
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