Geom rect fill not working properly for dates

[RAJ Rohit Jalem]

I have added a SO post for the problem:

http://stackoverflow.com/questions/37145874/geom-rect-fill-not-working-properly-for-dates

The problem is that, the Geom.rect() gets too messed up with dates, and instead of the desired color and fill, it fill it up with the color of the scatter plots in a very messed up way.

Did I do something wrong there?