如何在R中将字符转换为日期格式？ [英] How to convert character to Date format in R?

问题描述

如何将以下字符转换为日期格式？

How to convert the below in character to Date format?

YYYY.MM

我遇到了第10个月小数点后为零的问题。
说

I am facing an issue dealing with zeroes after decimal points for month 10. Say

2012.10 

出现在我的输入源数据中

appears in my input source data as

2012.1

，缺少十进制的零。

推荐答案

因为您只有年和 month ，则需要在 day 分配一些值，然后再转换为日期。在下面的示例中，日期被任意选择为 15 。

Since you have only year and month, you need to assign some value for day before you convert to date. In the example below, the day has arbitrarily been chosen as 15.

如果输入字符

dates = c("2012.10", "2012.01")

lubridate::ymd(paste0(year_month = dates, day = "15"))
#[1] "2012-10-15" "2012-01-15"

如果输入为数字

dates = c(2012.10, 2012.01)

do.call(c, lapply(strsplit(as.character(dates), "\\."), function(d){
    if(nchar(d[2]) == 1){
        d[2] = paste0(d[2],"0")
    }
    lubridate::ymd(paste0(year = d[1], month = d[2], day = "15"))
}))
#[1] "2012-10-15" "2012-01-15"

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