Datepicker issues in default theme.

Ran into a few issues with the datepicker in the reports view of the default theme. It uses the US standard date format (mm/dd/yyyy), and if the PHP locale is different, then the date query will be parsed differently by the server (e.g., 01/05/2013 will be parsed as 1st May 2013 and not 5th January 2013).

Also the "this week" quicklink breaks when the week crosses into the next month.

I haven't looked at the other bundled themes, but this may apply to them as well?