Lubridate 无法正确解析包含工作日/月/日/年的日期答案

【问题标题】：Date containing weekday/Month/Day/Year can't be correctly parsed by LubridateLubridate 无法正确解析包含工作日/月/日/年的日期
【发布时间】：2018-10-20 11:22:15
【问题描述】：

问题

我从一个网站下载了一个数据库，大叶栏目格式如下：

x <- c("Fri, Mar 1, 2019", "Sat, Mar 2, 2019", "Sun, Mar 3, 2019", "Mon, Mar 4, 2019", "Tue, Mar 5, 2019", "Wed, Mar 6, 2019", "Thu, Mar 7, 2019", "Fri, Mar 8, 2019", "Sat, Mar 9, 2019", "Sun, Mar 10, 2019", "Mon, Mar 11, 2019", "Tue, Mar 12, 2019", "Wed, Mar 13, 2019", "Thu, Mar 14, 2019", "Fri, Mar 15, 2019", "Sat, Mar 16, 2019", "Sun, Mar 17, 2019", "Mon, Mar 18, 2019", "Tue, Mar 19, 2019", "Wed, Mar 20, 2019", "Thu, Mar 21, 2019", "Fri, Mar 22, 2019", "Sat, Mar 23, 2019", "Sun, Mar 24, 2019", "Mon, Mar 25, 2019",  "Tue, Mar 26, 2019", "Wed, Mar 27, 2019", "Thu, Mar 28, 2019", "Fri, Mar 29, 2019", "Sat, Mar 30, 2019", "Sun, Mar 31, 2019")

其中包含从 3 月 1 日到 31 日的日期。我正在尝试将其转换为日期格式，因此我在 lubridate 中使用了 y ,dy 函数：

library("lubridate")
mdy(x)

这导致了以下向量：

 [1] "2019-03-01" "2019-03-02" "2019-03-20" "2019-04-20" "2019-05-20" "2019-03-06"
 [7] "2019-03-07" "2019-03-08" "2019-03-09" "2019-10-20" "2019-11-20" "2019-12-20"
[13] "2019-03-13" "2019-03-14" "2019-03-15" "2019-03-16" "2019-03-17" "2019-03-18"
[19] "2019-03-19" "2019-03-20" "2019-03-21" "2019-03-22" "2019-03-23" "2019-03-24"
[25] "2019-03-25" "2019-03-26" "2019-03-27" "2019-03-28" "2019-03-29" "2019-03-30"
[31] "2019-03-31"

如您所见，大多数日期都是正确的，但它不适用于该月的第 4、5、10、11 和 12 天，因为它在读取日期时就好像它是月份一样。我一直在尝试几种解决方案，但到目前为止都没有奏效

一些可能没有奏效的解决方案

使用正则表达式从字符向量中删除工作日：

我认为解决此问题的一种方法是删除字符串的工作日部分，因此我尝试删除逗号之前的所有内容，但我无法做到这一点：

library(stringr)
y <- str_extract(Dt,",.*$")
y 
 [1] ", Mar 1, 2019"  ", Mar 2, 2019"  ", Mar 3, 2019"  ", Mar 4, 2019" 
 [5] ", Mar 5, 2019"  ", Mar 6, 2019"  ", Mar 7, 2019"  ", Mar 8, 2019" 
 [9] ", Mar 9, 2019"  ", Mar 10, 2019" ", Mar 11, 2019" ", Mar 12, 2019"
 [13] ", Mar 13, 2019" ", Mar 14, 2019" ", Mar 15, 2019" ", Mar 16, 2019"
 [17] ", Mar 17, 2019" ", Mar 18, 2019" ", Mar 19, 2019" ", Mar 20, 2019"
 [21] ", Mar 21, 2019" ", Mar 22, 2019" ", Mar 23, 2019" ", Mar 24, 2019"
 [25] ", Mar 25, 2019" ", Mar 26, 2019" ", Mar 27, 2019" ", Mar 28, 2019"
 [29] ", Mar 29, 2019" ", Mar 30, 2019" ", Mar 31, 2019"

但是现在当我使用mdy 时，前 12 天我都错了。

mdy(y)

[1] "2019-01-20" "2019-02-20" "2019-03-20" "2019-04-20" "2019-05-20" "2019-06-20"
[7] "2019-07-20" "2019-08-20" "2019-09-20" "2019-10-20" "2019-11-20" "2019-12-20"
[13] "2019-03-13" "2019-03-14" "2019-03-15" "2019-03-16" "2019-03-17" "2019-03-18"
[19] "2019-03-19" "2019-03-20" "2019-03-21" "2019-03-22" "2019-03-23" "2019-03-24"
[25] "2019-03-25" "2019-03-26" "2019-03-27" "2019-03-28" "2019-03-29" "2019-03-30"
[31] "2019-03-31"

关于如何解决这个问题的任何想法？

会话信息

我按要求添加了 SessionInfo

R version 3.4.4 (2018-03-15) 
Platform: x86_64-pc-linux-gnu (64-bit)
Running under: Ubuntu 16.04.5 LTS

Matrix products: default
BLAS: /usr/lib/libblas/libblas.so.3.6.0
LAPACK: /usr/lib/lapack/liblapack.so.3.6.0

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=es_CL.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=es_CL.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=es_CL.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=es_CL.UTF-8 LC_IDENTIFICATION=C       

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] stringr_1.3.1   dplyr_0.7.6     rvest_0.3.2     xml2_1.2.0      XML_3.98-1.16  
[6] lubridate_1.7.4

loaded via a namespace (and not attached):
 [1] Rcpp_0.12.18     rstudioapi_0.7   knitr_1.20       bindr_0.1.1     
 [5] magrittr_1.5     tidyselect_0.2.4 R6_2.2.2         rlang_0.2.2     
 [9] httr_1.3.1       tools_3.4.4      pacman_0.4.6     selectr_0.4-1    
 [13] htmltools_0.3.6  yaml_2.2.0       rprojroot_1.3-2  digest_0.6.17   
 [17] assertthat_0.2.0 tibble_1.4.2     crayon_1.3.4     bindrcpp_0.2.2    
 [21] purrr_0.2.5      curl_3.2         glue_1.3.0       evaluate_0.11    
 [25] rmarkdown_1.10   stringi_1.2.4    pillar_1.3.0     compiler_3.4.4  
 [29] backports_1.1.2  pkgconfig_2.0.2

【问题讨论】：

mdy(x) 在我这边工作。
你能确认你在第 10 天得到了什么吗？
它对我也有效，适用于所有日期。您能否更新您的问题以包含来自sessionInfo() 的输出？
按要求添加了 sessionInfo，我开始认为这与语言环境有关
@DerekCorcoran 可能就是这样。使用与您相同版本的lubridate，我得到了正确的结果；主要区别似乎是我有LC_TIME=en_US.UTF-8

标签： r regex lubridate stringr

【解决方案1】：

正如@duckmayr 认为这是一个语言环境问题，如上面我的会话信息中所示，我的语言环境设置如下：

locale:
 [1] LC_CTYPE=en_US.UTF-8       LC_NUMERIC=C              
 [3] LC_TIME=es_CL.UTF-8        LC_COLLATE=en_US.UTF-8    
 [5] LC_MONETARY=es_CL.UTF-8    LC_MESSAGES=en_US.UTF-8   
 [7] LC_PAPER=es_CL.UTF-8       LC_NAME=C                 
 [9] LC_ADDRESS=C               LC_TELEPHONE=C            
[11] LC_MEASUREMENT=es_CL.UTF-8 LC_IDENTIFICATION=C

当我将 LC_TIME 更改为 en_US.UTF-8 时，一切都已修复，当我这样做时：

Sys.setlocale("LC_TIME", 'en_US.UTF-8')

然后使用mdy 工作得很好。希望这对将来有类似问题的人有所帮助

【讨论】：