Formatting dates with scale_x_date in ggplot2

With the new ggplot2 v 2.0.0, a way to do it is :

scale_x_date(date_breaks = "1 month", date_minor_breaks = "1 week",
             date_labels = "%B")

Nevermind, the answer was to use the version found in the documentation,

scale_x_date(breaks = "1 month", minor_breaks = "1 week", labels=date_format("%B")) +

And to include library(scales) as the documentation says.