Мы можем увеличить endtime
на 1 день, если startttime > endtime
, а затем использовать difftime
library(dplyr)
df %>%
mutate(endtime = if_else(starttime > endtime, endtime + 86400, endtime),
col = difftime(endtime,starttime,units = "hours"))
# starttime endtime col
#1 2019-11-05 18:02:04 2019-11-06 00:02:04 6.0000000 hours
#2 2019-08-02 20:18:00 2019-08-03 01:10:00 4.8666667 hours
#3 2019-12-07 17:28:00 2019-12-07 18:00:00 0.5333333 hours
data
df <- structure(list(starttime = structure(c(1572976924, 1564777080,
1575739680), class = c("POSIXct", "POSIXt"), tzone = "UTC"),
endtime = structure(c(1572912124, 1564708200, 1575741600), class = c("POSIXct",
"POSIXt"), tzone = "UTC")), row.names = c(NA, -3L), class = "data.frame")