r - R automatically converts dates to string when importing xlsx

Question

I have an excel file with a column of date info. These are the dates that people took a survey, and are formatted like "1/20/2017 2:22:34 PM" as downloaded from Qualtrics.

But when I import this file to R using read_excel, each date automatically gets converted to a string like "43122.82".

Ultimately I want these dates to be Date types. I'd appreciate any help.

Answer 1

您可以col_types在读取文件时尝试使用该参数，也可以在之后进行转换：

data$datecol <- as.Date(data$datecol, origin = "1900-01-01")

或者，如果它是，如你所说，一个字符串......

data$datecol <- as.Date(as.numeric(data$datecol), origin = "1900-01-01")

更好的是，为了保持时间，尝试：

library(lubridate)
data$datecol <- as_datetime(as.numeric(data$datecol)*3600*24, origin='1900-01-01')