Extract time only from POSIXlt object

Try

tt <- as.POSIXct("2011-01-29 15:00")
tt-trunc(tt,"days")

Note that this result can be used to add or subtract from datetime values, but I don't know of a convenient way to represent it as HH:MM:SS format.

How can I extract only the time component from an POSIXlt object?

For example if I try the following it still returns both the date and
time...

as.POSIXlt(tr.date[1])

[1] "2010-10-18 21:46:53"

as.POSIXlt(tr.date[1],"%H:%M:%S")

[1] "2010-10-18 21:46:53"

round and trunc don't help...  is there an "as.Time" equivalent to
as.Date  
?

Thanks, Simon

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