Format Date to Year-Month in R

Question

I would like to retain my current date column in year-month format as date. It currently gets converted to chr format. I have tried as_datetime but it coerces all values to

Answer 1

lubridate only handle dates, and dates have days. However, as alistaire mentions, you can floor them by month of you want work monthly:

library(tidyverse)

df_month <-
  df %>%
  mutate(Date = floor_date(as_date(Date), "month"))

If you e.g. want to aggregate by month, just group_by() and summarize().

df_month %>%
  group_by(Date) %>%
  summarize(N = sum(N)) %>%
  ungroup()

#> # A tibble: 4 x 2
#>  Date           N
#>       
#>1 2017-01-01    59
#>2 2018-01-01    20
#>3 2018-02-01    33
#>4 2018-03-01    45