不带as.Date的字符串20130118的日期转换 [英] Date conversion of string 20130118 with as.Date not succeeding

问题描述

我有一组日期，格式如下：

I have a set of dates formatted as following:

datevalue <- 20130118

我想将它们格式化为正确的日期，然后尝试使用以下代码进行操作：

I want to format them to a proper date and I try to do this with the following code:

date <- as.Date(datevalue,"%Y%m%d")

这与文档中列出的示例非常相似，但由于某些原因无法正常工作。在文档中列出了以下示例：

This is very similar to the example listed in the documentation but for some reason not working. In the documentation the following example is listed:

dates <- c("02/27/92", "02/27/92", "01/14/92", "02/28/92", "02/01/92")
as.Date(dates, "%m/%d/%y")
[1] "1992-02-27" "1992-02-27" "1992-01-14" "1992-02-28"
[5] "1992-02-01"

但是，我收到以下错误消息： charToDate（x）中的错误：字符串不在标准明确格式。从某种程度上来说，这对我来说很有意义，但是我感觉我的语法正确地定义了它。谁能解释为什么代码不起作用？

However, I get the following error message: "Error in charToDate(x): character string is not in a standard unambiguous format". This makes at some level sense to me, but I have the feeling that my syntax defined it properly. Anybody who can explain why the code is not working?

推荐答案

将变量定义为字符（如@Arun的评论中所述）工作了。代码：

Defining the variable as a character (as mentioned in @Arun's comment) worked. Code:

date2 <- as.Date(as.character(datevalue),"%Y%m%d")

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