[R] Extract time only from POSIXlt object

[Simon Goodman]

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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