AliCivil AliCivil - 2 months ago 15
R Question

convert character to time in R

In the following data frame the 'time' column is

character


id<-c(1,2,3,4)
time<-c("00:00:01","01:02:00","09:30:01","14:15:25")
df<-data.frame(id,time)


I wonder how I can convert it to
time
so that I can perform arithmetic calculations on it.

Answer

Use the function chron in package chron:

time<-c("00:00:01", "01:02:00", "09:30:01", "14:15:25")

library(chron)
x <- chron(times=time)

x
[1] 00:00:01 01:02:00 09:30:01 14:15:25

Do some useful things, like calculating the difference between successive elements:

diff(x)
[1] 01:01:59 08:28:01 04:45:24

chron objects store the values internally as a fraction of seconds per day. Thus 1 second is equivalent to 1/(60*60*24), or 1/86400, i.e. 1.157407e-05.

So, to add times, one simple option is this:

x + 1/86400
[1] 00:00:02 01:02:01 09:30:02 14:15:26
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