Whether QM correctly calculates dates?

Hi all.
Excel’s Date(), Eomonth() and Edate() are correctly calculate the beginning and the end dates for the months of 1900 year.
Why QM’s Date(), Eomonth() and Edate() can’t do the same? Or what am I doing wrong?
Thank you in advance for your help.
See the model file:
QM5.3.4 Date Functions wrong calcs. SAU.model