Each time I click on a date in the future to enter diary details - the
details are only entered into the current day.  e.g.  Today is 21 March.  If
I make an entry on 22 March it will immediately revert to posting that entry
to 21 March.

Whichever method I use - whether clicking on the actual date in the diary or
clicking on New appointment - entries are only made in that days date.

I have run diagnostics several times.  I have explored all options and I
have spent hours in Outlook Calendar trying to sort out the fault.
Please help