Error in period calculation whenMarch 28th 2016 is included

A very strange issue is happening on a form i created at www.roosdaal.be/openbaardomein (dutch language).

This form had fields for a start- and end-date and the next field calculates the nummer of days between them. This works just fine as long as the end date is before March 28th.

When the end date is or exceeds March 28th, this day is calculated as 0.96 instead of 1 day?

Enclosed screenshot shows result when March 28th is ending date (i have another screenshot showing March 27th, but i can onlu enclose one attachment)

Thank you for contacting us.

It appears that the issue has been already fixed on your form #52282860656360.

If you need any further assistance on this, please let us know.

Sorry for the inconvenience. I have just tested your form and was able to get the proper calculation of days. Could you please try clearing your cache and cookies of your browser.

If you are still having issues, please do let us know. We will be glad to take another look.