Dapple is a Javascript date manipulation library.
// Create a new instance of Dapple
calendar = new Dapple;
// Move forward 1 day
calendar.day.next();
// Move backwards 1 day
calendar.day.previous();
// Move 10 days forward
calendar.day.travel(10);
// Move 10 days backwards
calendar.day.travel(-10);
This is under active development. Expect the API to change.