Openoffice custom functions/macros

So, I "just" wanted to insert a date value into some openoffice spreadsheet, that should be derived from the documents name. I really thought, inserting a value derived from the current document's filename must be very easy.

I do a daily plan for the things I intend to do on a day, and name it "tagesplan_2008-11-22.ods".
And I want the name in this file not always be the date when I open/print the file, but the exact day it was intended for, and this is already coded into the filename.
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