Add a weekly calendar to Timesheet, All Timesheet
The monthly calendar is fine, but a weekly calendar would provide a more granular view of the week, and many organizations want timesheets posted by the end of each week.
This would be a big improvement. Weekly calendar much more useful than monthly on a day to day basis. Actually, the whole calendar function in timesheets could use a refresh. Take a look at how FreshBooks handles this, with monthly, weekly and daily views.