Create date column from datetime in R

Question

I am new to R and I am an avid SAS programmer and am just having a difficult time wrapping my head around R.

Within a data frame I have a date time column formatted as

Answer 1

Use the lubridate package. For example, if df is a data.frame with a column dt of type POSIXct, then you could:

df$date = as.Date(as.POSIXct(df$dt, tz="UTC"))
df$year = year(df$dt)
df$month = month(df$dt)
df$day = day(df$dt)
# and so on...

If your can store your data in a data.table, then this is even easier:

df[, `:=`(date = as.Date(as.POSIXct(dt, tz="UTC")), year = year(dt), ...)]