Passes if one Date instance represents the same "date" as another Date instance.

var date = new Date();
expect(date, 'to equal date', new Date());
expect(date, 'not to equal date', new Date(Date.UTC(2010, 10, 10)));

When the assertion fails you'll get this output:

var date = new Date(Date.UTC(2010, 10, 1));
expect(date, 'to equal date', new Date(Date.UTC(2010, 10, 10)));

expected new Date('2010-11-01T00:00:00Z')
to equal date new Date('2010-11-10T00:00:00Z')