> as.POSIXct("2000-01-01 00:00:00.002", tz = "UTC")
[1] "2000-01-01 00:00:00.001 UTC"
formatting it yields
> as.POSIXct("2000-01-01 00:00:00.002", tz = "UTC") |>
+ format("%Y-%m-%d %H:%M:%OS6")
[1] "2000-01-01 00:00:00.001999"
Is this a configuration error? windows? R 4.3.1
Thank you!