I would use package chron and trunc()....
One example from the help of trunc.times (modified):
lirary(chron)
tt <- times(c("12:13:14", "15:46:17"))
trunc(tt, times("00:30:00"))
HTH
Jannis
--- Schatzi <adele_thomp...@cargill.com> schrieb am Mo, 9.5.2011:
> Von: Schatzi <adele_thomp...@cargill.com>
> Betreff: [R] Round down to earliest hour or half hour
> An: r-help@r-project.org
> Datum: Montag, 9. Mai, 2011 14:06 Uhr
> I have times and would like to round
> down to the earliest 30 minute
> increment. For instance, a time of
> 2011-04-28 09:02:00
> (the as.numeric value = 1303999320)
> I would like it to be rounded down to:
> 2011-04-28 09:00:00
> (the as.numeric value = 1303999200)
>
> Any ideas of how to do this?
>
> -----
> In theory, practice and theory are the same. In practice,
> they are not - Albert Einstein
> --
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> Sent from the R help mailing list archive at Nabble.com.
>
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