extracting time from datetime in R

Question

I have a column "datetime" which have value as "899-12-30 07:00:00"

on checking the information I am getting.

> typeof(time_info$datetime)
[1] "double"
> class(time_info$datetime)
[1] "POSIXct" "POSIXt"

I want to extract just the time which is 0700 without seconds in this case. How can I do this ?

answer is here:http://stackoverflow.com/questions/39756615/remove-seconds-from-time-in-r — Adamm, May 12 '17 at 09:34

score 3 · Accepted Answer · answered May 12 '17 at 09:35

3

We can do this using format

format(strptime(str1, "%Y-%m-%d %H:%M:%S"), "%H%M")

str1 <- "899-12-30 07:00:00"

answered May 12 '17 at 09:35

akrun

score -1 · Answer 2 · answered May 12 '17 at 09:36

-1

Let's say we have Time.now ( youhave your own time) that is the way

t = Time.now
t.strftime("%I:%M%p")

answered May 12 '17 at 09:36

Sergio Suarez

score -2 · Answer 3 · answered May 12 '17 at 09:37

-2

Or you can directly extract time part:

substr("899-12-30 07:00:00",11,15)
# [1] "07:00"

answered May 12 '17 at 09:37

Erdem Akkas

This changes the value to a string, losing the ability to perform date-time arithmetic. – Khashir Jul 31 '19 at 17:02

3 Answers3