splitting Interval Date in character and casting into Date in R-CodePudding

I have below Date column in character (from ENTSO-E platform). I want to convert into Date and extract the end part of this Interval ([1] "01.01.2021 00:00 - 01.01.2021 01:00"). I am receiving error "character string in unambiguous format". Any suggestions how can I extract the second part of the interval that is in character format to a Date variable in R?

head(date)

"01.01.2021 00:00 - 01.01.2021 01:00"
"01.01.2021 01:00 - 01.01.2021 02:00"
"01.01.2021 02:00 - 01.01.2021 03:00"
"01.01.2021 03:00 - 01.01.2021 04:00"
"01.01.2021 04:00 - 01.01.2021 05:00"
"01.01.2021 05:00 - 01.01.2021 06:00"

Error in as.POSIXlt.character(x, tz, ...) : 
  character string is not in a standard unambiguous format

CodePudding user response：

as.POSIXct(gsub("^.* - (.*)", "\\1", x), format = "%d.%m.%Y %H:%M")
# [1] "2021-01-01 01:00:00 CET" "2021-01-01 02:00:00 CET" "2021-01-01 03:00:00 CET" "2021-01-01 04:00:00 CET"
# [5] "2021-01-01 05:00:00 CET"

sample data

x <- c("01.01.2021 00:00 - 01.01.2021 01:00",
       "01.01.2021 01:00 - 01.01.2021 02:00",
       "01.01.2021 02:00 - 01.01.2021 03:00",
       "01.01.2021 03:00 - 01.01.2021 04:00",
       "01.01.2021 04:00 - 01.01.2021 05:00")

CodePudding user response：

Here is tidyverse in combination with lubridates dmy_hm function:

library(lubridate)
library(dplyr)
library(tidyr)
df %>% 
  separate(date, c("a", "date"), " - ") %>% 
  mutate(date = dmy_hm(date), .keep="used")

date               
  <dttm>             
1 2021-01-01 01:00:00
2 2021-01-01 02:00:00
3 2021-01-01 03:00:00
4 2021-01-01 04:00:00
5 2021-01-01 05:00:00
6 2021-01-01 06:00:00