Always show day of week in the date picker

When setting a due date for a task, it is helpful to see the day of week together with the date in the date picker widget. For now the date picker only shows numbers, and weekdays are shown only if you also set a time for the notification. If you know that you have to do something next Tuesday, you could simply rotate the picker until the next Tuesday, instead of counting the days in your head or looking up the date in a calender.