[r] How to parse milliseconds in R?

Question

How do I use strptime or any other functions to parse timestamps 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 13:55:23"`

Answer 1

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
 op <- options(digits.secs=3)
 z
 options(op) #reset options

Answer 2

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