使用％b格式化日期时出现R strptime问题 [英] R strptime issue when using %b to format a date

问题描述

在标记为重复之前，我尝试了其他一些解决方案，即：

Before marking as duplicate, I've tried a few other solutions, namely these:

R，strptime（），％b，试图将字符转换为日期格式

strptime，如POSIXct和日期返回意外的NA

但似乎都不适合我。

我正在尝试将时间格式 Dec-18 转换为POSIXct时间（将为 2018-12 -01 ）。我正在尝试将 strptime 与％b 和％y 这样实现：

I'm trying to convert a time format Dec-18 to a POSIXct time (would be 2018-12-01 in this case). I'm attempting to use strptime with %b and %y to achieve this as so:

> strptime("Dec-18", format = "%b-%y")
[1] NA

但是显然它不起作用。我正在阅读有关语言环境之类的信息，但是上述解决方案不适用于我。我尝试了以下操作：

But obviously it is not working. I'm reading a out about "locales" and such, but the above solutions did not work for me. I attempted the following:

> Sys.setlocale("LC_TIME", "C")
[1] "C"
> strptime("Dec-18", format = "%b-%y")
[1] NA

还建议使用此语言环境 Sys.setlocale（ LC_TIME， en_GB.UTF-8），但是当出现错误尝试使用此功能：

It was also suggested to use this locale, Sys.setlocale("LC_TIME", "en_GB.UTF-8"), but I get an error when trying to use this:

> Sys.setlocale("LC_TIME", "en_GB.UTF-8")
[1] ""
Warning message:
In Sys.setlocale("LC_TIME", "en_GB.UTF-8") :
  OS reports request to set locale to "en_GB.UTF-8" cannot be honored

对此不知所措。基于此，我的缩写月份似乎是正确的：

Kind of at a loss for what to do here. My abbreviated months seem right based off this:

> month.abb
 [1] "Jan" "Feb" "Mar" "Apr" "May" "Jun" "Jul" "Aug" "Sep" "Oct" "Nov" "Dec"

以下是我正在运行的R版本：

Here's the version of R that I am running:

R version 3.5.3 (2019-03-11) -- "Great Truth"
Copyright (C) 2019 The R Foundation for Statistical Computing
Platform: x86_64-w64-mingw32/x64 (64-bit)

谢谢。

推荐答案

最简单的解决方案是：

as.Date(x = paste0("01-", "Dec-18"),
        format = "%d-%b-%y")
#> [1] "2018-12-01"

format(x = as.Date(x = paste0("01-", "Dec-18"),
                   format = "%d-%b-%y"),
       format = "%b-%y")
#> [1] "Dec-18"

^{在2019-05-15由< a href = https://reprex.tidyverse.org rel = nofollow noreferrer> reprex软件包（v0.2.1）}

^{Created on 2019-05-15 by the reprex package (v0.2.1)}

R 不能将12月18日识别为日期。添加 01-，以便它可以将其检测为日期，然后根据需要显示。

R doesn't recognise Dec-18 as date. Add a 01- so that it can detect it as date, and then display as you prefer.

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