When writing (short date-input) 09/08 on numeric keyboard in recent versions follows the correct date in the input-field - in this case 09.08.2012 (German-Date). This was a feature like in excel for a very quick input of many dates in the sheet... In this 3.6 version it don't change to the correct date - it stays the 09/08. That means you have now a lot of work to get in new dates in the spread-sheet. This is a big bug!
FYI: This feature has been changed for the 3.6 release. http://erack.org/blog/archives/8-LibreOffice-date-acceptance-patterns.html It sounds like what you are seeing is intentional.
This problem should be fixed with fixes for "Bug 52240 - [Task] EDITING: Incomplete Date values are no longer detected" I mark this one INVALID because too much info is missing. @Reporter Please feel free to reopen this Bug if you still see that problem with LibO 3.6.2, but then please contribute complete useful info due to http://wiki.documentfoundation.org/BugReport> (Localization, sample document, ...). WFM, I can add an appropriate recognition pattern, and I do not have the time to find out whether this one might be DUP of an other one (or vice versa).
*** This bug has been marked as a duplicate of bug 52240 ***