Problem with as.POSIXct()

Hi, when I type in these words:

a=c("2011-06-01 17:21:24.83", "2011-06-01 17:21:24.283")
as.POSIXct(a)

the real output is:
   [1] "2011-06-01 17:21:24.830 CST" "2011-06-01 17:21:24.283 CST"
   
rather than the expected one:
   [1] "2011-06-01 17:21:24.083 CST" "2011-06-01 17:21:24.283 CST"

How can I deal with such milliseconds less than 100?

Thanks



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