Read csv file using read.csv() without losing milliseconds

Question

I have a csv file with a timestamp column. The timestamps are in the format %Y-%m-%d %H:%M:%OS4 that is there is a milliseconds value also of 4 digits. When i read this csv using read.csv() I do not get the milliseconds but only till seconds in character format. How can I read the milliseconds also ?
Edit to add requires data and code:
mtc_data = read.csv(path/to/csv)
Notepad.pw link to data

Answer 1

After reading in with read.csv (where you may want to use option stringsAsFactors=FALSE) use as.POSIXct with the format string you already have. The miliseconds are internally stored. Using strftime you can display the miliseconds, the variable is no longer "POSIXct" format then, but "character". It might be more safe to use trimws to get rid of unnecessary spaces after reading in.

dat <- read.csv("V:/R/_data/yourData.csv", stringsAsFactors=FALSE)
(x <- as.POSIXct(trimws(dat$timestamp), format="%Y-%m-%d %H:%M:%OS"))
# [1] "2018-11-20 00:00:00 CET" "2018-11-20 00:00:05 CET" "2018-11-20 00:00:07 CET"

x2 <- strftime(x, format="%Y-%m-%d %H:%M:%OS6")
x2
# [1] "2018-11-20 00:00:00.000000" "2018-11-20 00:00:05.058399" "2018-11-20 00:00:07.540699"