The bug has been opened on https://bugs.launchpad.net/bugs/368906

"I am using Ubuntu 9.04, and today I tried to add an appointment to Evolution (the folder dates back to -approx. Ubuntu 7.04, and also the calendar).

Steps to reproduce
1. open the calendar page
2. select date and time for the appointment
3. create a new appointment
  -> the mask has not set the starting and ending time, but only the dates
4. try to set starting or ending time
  -> nothing is set
5. save the appointment
  -> there is no appointment marked, except for List view (Elenco in it-it l10n)
6. try to edit the appointment and set time
  -> still nothing modified
7. close the appointment
  -> Evo asks for saving changes, whilst there's no change at all
8. try to modify the starting (ending) time of the appointment from the List view
  -> (attached screenshot 1) Evo warns about wrong date format: "La data deve essere nel formato: 1.30" (Date has to be in 1.30 format)
9. try to change date and time of the appointment to "Now" from the List view
  -> (attached screenshot 2) Evo warns about wrong date format: "La data deve essere inserita nel formato: mer 29/04/2009, 0.18.23" (Date has to be inserted in the format: Wed 29/04/2009, 0.18.23)

The only result is I am totally unable to add new useful appointments to Evolution."