R Class 转向 NULL 而不是日期

Question

所以我有如下数据

data <- structure(list(LICENCE_RENEWAL_DATE = c("NA", "NA", "NA", "2022-02-12T07:42:49Z", 
"2022-02-10T13:52:37Z", "NA", "NA", "2022-02-13T16:37:48Z", "NA", 
"NA"), LICENCE_RENEWAL_DATE2 = c("NA", "NA", "NA", "2022-02-12", 
"2022-02-10", "NA", "NA", "2022-02-13", "NA", "NA")), row.names = c(NA, 
10L), class = "data.frame")

我通过运行得到这个：

data <- full_data %>% 
  mutate(LICENCE_RENEWAL_DATE2 = substr(LICENCE_RENEWAL_DATE, 1, 10)) %>% 
  select(LICENCE_RENEWAL_DATE, LICENCE_RENEWAL_DATE2)

我以为我可以将 substr() 与 lubridate 的 as_date() 夹在中间，但这不起作用。 LICENCE_RENEWAL_DATE2 的 class 为 NULL，我不知道该怎么做。但我需要它是 class = Date.

Answer 1

你可以这样做：

full_data$LICENCE_RENEWAL_DATE2 <- as.Date(full_data$LICENCE_RENEWAL_DATE2, format = "%Y-%m-%d")

它会将 LICENCE_RENEWAL_DATE2 列的 class 转换为 Date。

> class(full_data$LICENCE_RENEWAL_DATE2)
[1] "Date"

Answer 2

您可以尝试以下解决方案**

data <- structure(
list(
LICENCE_RENEWAL_DATE = c(" ", " ", " ", "2022-02-12T07:42:49Z", "2022-02-10T13:52:37Z", 
" ", " ", "2022-02-13T16:37:48Z", " ", " "),
LICENCE_RENEWAL_DATE2 = c(" ", " ", " ", "2022-02-12", "2022-02-10", " ", " ", 
"2022-02-13", " ", " ")),  
row.names = c(NA, 10L),class = "data.frame")

创建数据时不涉及 NA

full_data <- data %>% 
    mutate(LICENCE_RENEWAL_DATE2 = substr(LICENCE_RENEWAL_DATE, 1, 10)) %>% 
    select(LICENCE_RENEWAL_DATE, LICENCE_RENEWAL_DATE2)

转换日期时间（“POSIXct”“POSIXt”）和日期中的两列

library(anytime)
full_data$LICENCE_RENEWAL_DATE <- anytime(full_data$LICENCE_RENEWAL_DATE)
full_data$LICENCE_RENEWAL_DATE2 <- anydate(full_data$LICENCE_RENEWAL_DATE2)

检查数据类型

> class(full_data$LICENCE_RENEWAL_DATE) 
[1] "POSIXct" "POSIXt" 
> class(full_data$LICENCE_RENEWAL_DATE2) 
[1] "Date"

我希望这个解决方案能解决您的问题

R Class 转向 NULL 而不是日期

R Class turning to NULL instead of date

r

date

dplyr

tidyverse

lubridate