Calendar month shift

[Edisson]

I've noticed one thing but didn't see yet how it works inside.

for example firstly select about the last day of a month

then make focus anywhere else and click again on that date-item month
the caption of month is changed but we see the same calendar (days) for the previous month:

seems to me in this case we have a mismatch of caption of calendar and real days.
is it kind of a bug or a feature?

[robicch]

June 31th is a non-working day, so the start shifts to the next working day.

Is Sunday is working, set it on iI8nJs.js