MDL-71264 behat: New feature covering all day/month/year date changes
Because of the order that dates and datetimes are filled by behat
sometimes there are some intermediate results that are impossible
and then the form (javascript) automatically reacts and fixes the
date, ultimate leading to a different date that the one we wanted
to set with Behat.
This is noticeable when switching between months (with some day
being the last day of the month) and the 2 months have a different
number of days. For example April date => March date (or the opposite).
This test covers all the critical changes (day, month and year),
back and forth. All times are Perth/Australia.