如何计算 dplyr 中两个日期之间的差异（以天为单位）？ R

Question

I need to calculate the difference in days between two dates in R. The two dates are in different column and I just need to create another column named DAY_DIFFERENCE. Here is a simple structure of my table:

     date1           date2     days_diff
     2021-09-12    2021-09-13      1
      

Answer 1

this is a possible solution;

date1 <- as.Date("2021-09-12")

date2 <- as.Date("2021-09-13")

datediff <- date2 - date1

If you just want the difference as a number

as.numeric(datediff)

with dplyr

library(dplyr)
df <- data.frame(date1 = c("2021-09-12","2021-09-13"),
                 date2 = c("2021-09-13","2021-10-14"))

df$date1 <- df$date1 %>%
  as.Date()
df$date2 <- df$date2 %>%
  as.Date()

df$datediff <- as.numeric(df$date2 - df$date1)

Answer 2

You don't need dplyr . Try difftime() .

date1 <- "2021-09-12"

date2 <- "2021-09-13"

days_diff <- as.numeric(difftime(date2, date1))

days_diff
# [1] 1