[R] R Studio_Dates and Times

Dates & Times

• A date ("2022-07-04)
• A time within a day ("20:11:59 UTC")
• date-time ("2022-07-04 19:54:52 UTC")

today() & now()

• 오늘의 날짜를 반환

• today()
  -> [1] "2022-07-04"

• now()
  -> [1] "2022-07-04 19:54:52 UTC"

문자열에서 날짜 타입으로

• ymd("2022-07-04")
  -> [1] "2022-07-04"

• ymd(20220704)
  -> [1] "2022-07-04"

• mdy("July 4th, 2022")
  -> [1] "2022-07-04"

• dmy("04-July-2022")
  -> [1] "2022-07-04"

• ymd_hms("2022-07-04 20:11:59")
  -> [1] "2022-07-04 20:11:59"

• mdy_hm("07/04/2022 20:01")
  -> [1] "2022-07-04 20:01:00 UTC"

• as_date(now())
  -> [1] "2022-07-04"