On Mon, 23 Feb 2015, Blake Watson wrote:
So, I hit my first unimplemented function: DateDif

I'm curious as to why it's not implemented.

Because no-one has got round to volunteering a contribution to add it!

(All the functions used in my $DAYJOB spreadsheets which need POI evaluation are implemented, as I suspect they are for the other contributors to the project so far. We're all volunteers here, so we all work on the things that matter to us)


If this function matters to you, we'd love a patch! A rough guide to contributing is available at http://poi.apache.org/guidelines.html - a patch plus unit test would be wonderful. If you're new to Excel formula evaluation in POI, then this talk from Yegor from a few years ago is probably the best into we have:
http://people.apache.org/~yegor/apachecon_us2010/Evaluation_Of_Excel_Formulas_In_POI.pptx

Please do implement this missing function, and any others too that interest you!

Thanks
Nick

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