Since Gramps is developed by an international team, and Europe does day-month-year, a better term for month-day-year is the term is "US local date format".

Anyway... Edit->Preferences Display tab should have what you need.

On 05/17/2014 06:07 PM, Stephen Clingerman wrote:
I just started using the 4.0.3-1 OS/X. I was using 3.x. There used to be date which allowed to as “normal" calendar (e.g.  May 17, 2014). Now all the dates are yyyy-mm-dd. Is there a way to mass change the date to then”normal” calendar? The manual doesn’t seem to have a way to do this.

"Mathematics deals exclusively with the relations of concepts to each 
other without consideration of their relation to experience."
Albert Einstein