How to parse milliseconds?

How do I use strptime or any other functions to parse time stamps with milliseconds in R?

time[1]
# [1] "2010-01-15 13:55:23.975"
strptime(time[1], format="%Y-%m-%d %H:%M:%S.%f")
# [1] NA
strptime(time[1], format="%Y-%m-%d %H:%M:%S")
# [1] "2010-01-15 13开发者_运维问答:55:23"`

Courtesy of the ?strptime help file (with the example changed to your value):

> z <- strptime("2010-01-15 13:55:23.975", "%Y-%m-%d %H:%M:%OS")
> z # prints without fractional seconds
[1] "2010-01-15 13:55:23 UTC"

> op <- options(digits.secs=3)
> z
[1] "2010-01-15 13:55:23.975 UTC"

> options(op) #reset options

You can also use strptime(time[1], "%OSn") where 0 <= n <= 6, without having to set digits.secs.

The documentation states "Which of these are supported is OS-dependent." so YMMV.