Kelas data temporal di R

Memanipulasi Data Deret Waktu di R

Harrison Brown

Graduate Researcher in Geography

Kelas date-time

numeric
- Bilangan bulat, pecahan, dll.
- 9 Agustus 2022 = 19223
- Jumlah hari sejak 1 Jan 1970
character
- String teks, nama, dll.
- 9 Agustus 2022 = "2022-08-09"
- 9 Agustus 2022 = "August 9, 2022"

start_date <- as_date("2022-08-01")
end_date <- as_date("2022-08-09")

end_date - start_date

Time difference of 8 days

POSIXct
- Tanggal dan waktu, zona waktu
- 9 Agustus 2022, 4:17 p.m. =
  - "2022-08-09 20:17:00 UTC"

start_time <-
  as.POSIXct("2022-08-01 08:57:00 EDT")
end_time <-
  as.POSIXct("2022-08-09 15:30:00 EDT")
end_time - start_time

Time difference of 8.272917 days

lubridate::as_date()

my_date <- as_date("2022-01-20")

my_date

[1] "2022-01-20"

class(my_date)

[1] "Date"

as_date() vs base::as.Date()

class("2022-08-01")

[1] "character"

is.numeric(10494)

[1] TRUE

is.character("April 01, 2003")

[1] TRUE

is.Date(lubridate::today())

[1] TRUE

is.POSIXct(lubridate::now())

[1] TRUE

Memanipulasi Data Deret Waktu di R