as.Date 没有将字符日期转换为 R 中的日期

Question

I am trying to convert a character date to date but result is somehow a double.

> x
[1] "2017-10-31"
> as.Date(x)
[1] "2017-10-31"
> as.Date(x) %>% typeof
[1] "double"

> as.Date(x,format="%Y-%m-%d") %>% typeof
[1] "double"

Answer 1

According to ?typeof

typeof determines the (R internal) type or storage mode of any object

Instead of typeof , check the class

library(magrittr)
as.Date(x) %>%
    class
# [1] "Date"

Also, can be checked with inherits

as.Date(x) %>%
   inherits('Date')
#[1] TRUE

data

x <-  "2017-10-31"