Filter all days between a time range in R

Question

I have a data frame like below:

entry_no      id            time
_________     ___           _____
1              1        2016-09-01 09:30:09
2                      


        

Answer 1

I would suggest using lubridate package.

library(lubridate)

date1 <- as.POSIXct("2016-09-01 09:00:00") #lower bound
date2 <- as.POSIXct("2016-09-01 10:00:00") #upper bound
rng <- new_interval(date1, date2)          #desired range

result <- df[df$time %within% rng,]

You may need to check the class of time variable and apply some changes before using the above:

df$time <- as.POSIXct(df$time)

Answer 2

You could achieve it with a bit of simple formatting:

dat$hms <- format(as.POSIXct(dat$time), "%H:%M:%S")
dat[dat$hms >= "09:00:00" & dat$hms <= "10:00:00",]

#  entry_no id                time      hms
#1        1  1 2016-09-01 09:30:09 09:30:09