[R] Clean method to convert date and time between time zones keeping it in POSIXct format

[Gabor Grothendieck]

This involves mucking with the internals as well but it is short:

   structure(T1, tzone = "UTC")

On Mon, May 9, 2016 at 9:24 AM, Arnaud Mosnier <a.mosnier at gmail.com> wrote:
> Dear UseRs,
>
> I know two ways to convert dates and time from on time zone to another but
> I am pretty sure that there is a better (cleaner) way to do that.
>
>
> Here are the methods I know:
>
>
> ## The longest way ...
>
> T1 <- as.POSIXct("2016-05-09 10:00:00", format="%Y-%m-%d %H:%M:%S",
> tz="America/New_York")
>
> print(T1)
>
> T2 <- as.POSIXct(format(T1, tz="UTC"), tz="UTC") # format convert it to
> character, so I have to convert it back to POSIXct afterward.
>
> print(T2)
>
>
>
> ## The shortest but probably not the cleanest ...
>
> attributes(T1)$tzone <- "UTC"
>
> print(T1)
>
>         [[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.



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