how do I define a date format

[Rod Butcher <rbutcher hyenainternet com>]

Greetings gnumericsters from Sydney. I need to work with spreadsheets 
which have a date column I can sort the entries by. I use dd/mm/ccyy for 
date format e.g. 31/12/2005. I haven't managed to define this in 
gnumeric for data entry or valiodation.
I went to format cells - date but couldn't find a way to define a new 
date format.
I tried defining it just as custom. But couldn't find a way to specify 
edit rules for the new "custom" cell rule.
Is dd/mm/ccyy currently not possible, or am I just a klutz ?
thanks
Rod
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