Rubius released Google Chrome extension allowing you to use Trello as your week planner.
It has interface like Google Calendar but you can manage your schedule right on the Trello board. You can drag cards to the calendar to specify time or create a new one right here. All cards with due dates will be shown on the calendar.
At the top of the calendar you can create all-day or multi-day events. It allows you to plan longtime tasks and display your projects timeline.
Event takes the card label color. Also, you can display the archived cards to view the history of accomplished tasks.
If you want to use Trello not only as task lists but for planning your time as well, Planyway extension will be a real find for you.