How to convert dd/mm/yy to yyyy-mm-dd in R

Question

I have a vector with dates values in this format dd/mm/yy e.g.(27/06/16). I want to convert this in this format yyyy-mm-dd e.g.(2016-06-27) for logical comparison. I am usin

Answer 1

Try

as.Date( as.character("27/06/16"), format = "%Y-%m-%d")

Answer 2

One option would be to convert both date formats into a common POSIX representation:

d1 <- strptime("27/06/16", "%d/%m/%y")
d2 <- strptime("2016-06-27", "%Y-%m-%d")

Since both d1 and d2 should be of the same R class, you can then just compare them as you wish.

Answer 3

strDates <- c("27/06/16")
dates <- as.Date(strDates, "%m/%d/%Y")

this works.

refer this for more.http://www.statmethods.net/input/dates.html

Answer 4

Use lubridate package

library(lubridate)
dmy("27/06/16")

Answer 5

Using dplyr

df.with.converted.date <- df.with.original.date %>%
  mutate(new.date.var = as.character(as.Date(old.date.var, "%m/%d/%Y"),"%Y%m%d"))

For example this will convert "5/3/2019" to 20190503

Answer 6

With base R

as.Date(as.character("27/06/16"), format = "%d/%m/%y")