Home ggplot2's x-axis displays the starting date of next month instead of ending date of current month

Questions

ggplot2's x-axis displays the starting date of next month instead of ending date of current month

June 24, 2022

Given a dataframe df:

df <- structure(list(date = structure(c(19204, 19235, 19265, 19296), class = "Date"), 
    value = c(3.5, 3.6, 4.05, 4.13)), row.names = c(NA, -4L), class = "data.frame")

Out:

       date value
1 2022-07-31  3.50
2 2022-08-31  3.60
3 2022-09-30  4.05
4 2022-10-31  4.13

I want the x-axis to display the date values of date column in df, that is, July, August, September, October, the last day of these months, but I have tried several methods, all of which are displayed on the first day of the next month. How could we deal with this problem? Thanks.

ggplot(data=df, aes(x=date, y=value)) +
  geom_line(linetype='solid', alpha = 1, size = 1.5, color='blue') +
  geom_point(alpha = 1, size = 4, color='blue') +
  # scale_x_date(limits = as.Date(c("2022-07-31", "2022-10-31"), format = '%Y-%m-%d'), breaks = '1 month')
  # scale_x_continuous(labels=format(as.Date(df$date), "%Y-%m-%d"))
  # scale_x_datetime(breaks = df$date, date_labels = '%Y-%m-%d') 
  # scale_x_date(breaks = "1 month", minor_breaks = "1 month", date_labels = "%Y-%m-%d")
  scale_x_date(breaks = "1 month", minor_breaks = "1 month", date_labels = "%Y-%m-%d",
               limits = c(min(df$date), max = max(df$date)))

Out:

>Solution :

If you provide an explicit list of breaks, ggplot will "obey". So, you could use the following code:

ggplot(data=df, aes(x=date, y=value)) +
  geom_line(linetype='solid', alpha = 1, size = 1.5, color='blue') +
  geom_point(alpha = 1, size = 4, color='blue') + 
  scale_x_date(breaks = as.Date(c("2022-07-31", "2022-08-31", "2022-09-30", "2022-10-31")))

or even shorter:

ggplot(data=df, aes(x=date, y=value)) +
  geom_line(linetype='solid', alpha = 1, size = 1.5, color='blue') +
  geom_point(alpha = 1, size = 4, color='blue') + 
  scale_x_date(breaks = df$date)

yielding this plot: