difftime between days not woking

[jaziel2503]

I have a data frame for bike trip for a city, I have two columns, one for the start date-time and other for the end date-time, the tripduration is a calculated column using the difftime function.

bikeRides$tripduration <- difftime(bikeRides$ended_at, bikeRides$started_at, units ="hours")

The problem is. whatever time unit I use, when the trip goes for one day to another, the time it calculates is more than a day as you can see in the second column, that being a aprox 20 minutes trip

[nirgrahamuk]

I can't seem to make this not work...

s_t1 <- "2020-07-24 23:56:30"
s_t2 <- "2020-07-25 00:20:17"

l_t1 <- as.POSIXlt(s_t1)
l_t2 <- as.POSIXlt(s_t2)
difftime(l_t2,l_t1,units = "hours")
# Time difference of 0.3963889 hours
c_t1 <- as.POSIXct(s_t1)
c_t2 <- as.POSIXct(s_t2)
difftime(c_t2,c_t1,units = "hours")
#Time difference of 0.3963889 hours

perhaps to help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one:

FAQ: How to do a minimal reproducible example ( reprex ) for beginners

A minimal reproducible example consists of the following items: A minimal dataset, necessary to reproduce the issue The minimal runnable code necessary to reproduce the issue, which can be run on the given dataset, and including the necessary information on the used packages. Let's quickly go over each one of these with examples: Minimal Dataset (Sample Data) You need to provide a data frame that is small enough to be (reasonably) pasted on a post, but big enough to reproduce your issue. Let's say, as an example, that you are working with the iris data frame head(iris) #> Sepal.Length Sepal.Width Petal.Length Petal.Width Species #> 1 5.1 3.5 1.4 0.…

[aephiday25]

@jaziel2503

bikeRides$tripduration <- difftime(bikeRides$ended_at, bikeRides$started_at, units ="hours")

If this not work for you, try using as.duration() from {lubridate} package.

library(dplyr)
library(lubridate)

bikeRides <- bikeRides %>% 
    mutate(tripduration = as.duration(started %--% ended)/dhours(1))