[英]convert string to date type with lubridate in r
I have a column dateofbirth contain string type of date such as 11-12-89, I want to convert it to date type in order to use lubridate::year() to extract the year.我有一列 dateofbirth 包含日期的字符串类型,例如 11-12-89,我想将其转换为日期类型以便使用 lubridate::year() 来提取年份。 I am wondering how to convert this to date format like 11/12/1989 ).
我想知道如何将其转换为日期格式,如 11/12/1989 )。 By the way, when use fwrite() to output the csv file and read in excel show the dateofbirth is something like "11/12/1989", but in r when use fread to read the original file the dateofbirth is like "11-12-89".
顺便说一句,当使用 fwrite() 输出 csv 文件并在 excel 中读取时显示出生日期类似于“11/12/1989”,但在 r 中使用 fread 读取原始文件时,出生日期类似于“11- 12-89"。
Thank you in advance.先感谢您。
Assuming the date format that you have is date-month-year.假设您拥有的日期格式是日期-月-年。
In base R, you can use :在基础 R 中,您可以使用:
#Convert to date
df$dateofbirth <- as.Date(df$dateofbirth, '%d-%m-%y')
#Get the year
df$year <- as.integer(format(df$dateofbirth, "%Y"))
OR with lubridate
或用
lubridate
library(lubridate)
df$dateofbirth <- dmy(df$dateofbirth)
df$year <- year(df$dateofbirth)
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