Allow custom date order in label_date_short()

[CMKnott]

Under the current build, the long labels must render as %b-%Y.

However, it would be good to specify that the long labels should go %Y-%b.

For example

# Data
df_test <- 
  tibble(
    date = seq(as.Date("2010-1-1"), as.Date("2012-1-1"), by = "months"),
    value = rnorm(n = length(date), mean = 10, sd = 1))

# Graph
df_test %>% 
  ggplot(aes(x = date, y = value)) +
  geom_line() + 
  scale_x_date(date_breaks = "1 month",
               labels = scales::label_date_short(format = c("%Y", "%b"))) + 
  theme(axis.text.x = element_text(angle = 0, hjust = 1))

This produces the graph

See that the long labels render %b-%Y. It would be good to specify that the long labels should go %Y-%b too.

[thomasp85]

As can be read in the docs, the format argument should not be used to specify the order of the date format but rather the format to use for year, month, day, and hour respectively. There is no way to alter the order they are shown in