Issues with ACCRINT

It seems that I’m not the only one struggling with ACCRINT:

• Gnumeric attempting to implement it
• OASIS struggling to make sense our of it for ODF 1.2
• OASIS struggling again, for the same reasons, with a bit more background
• WestClinTech explaining why Excel’s calculation of an odd long first coupon is wrong
• Bond traders comparing Excel and Bloomberg

So, I asked for help on Stackoverflow and Quantitative Finance. Let’s see where this goes…