Changes to date display in week view don't take:
1. Go to My Calendar > Settings > Calendar Time Formats.
2. I changed the "Date in grid mode, week view" to "M j" (I believe it had been M j, 'y)
3. I then clicked "Save Date/Time Settings".
Result: the field blanked out and the display in the weekly calendar was unchanged (http://middlefieldma.net/). I had wanted to change e.g. "Apr 17, '14" to "Apr 17".