[Rd] NEWS on time zone reconciliation in [<-.POSIXlt

[Suharto Anggono Suharto Anggono]

 Because it is the core of PR#18919, it would be proper for the NEWS item to mention PR#18919.

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On Friday, 17 April 2026 at 02:13:48 pm GMT+7, Suharto Anggono Suharto Anggono <suharto_anggono using yahoo.com> wrote:


[...]

No, such a NEWS item should be for R 4.6.0. The porting of time zone reconciliation in '[<-.POSIXlt' and '[<-.POSIXlt' has been removed from R-4-5-branch.

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On Friday, 10 April 2026 at 09:58:25 pm GMT+7, Martin Maechler <maechler using stat.math.ethz.ch> wrote:


>>>>> Suharto Anggono Suharto Anggono via R-devel
>>>>>    on Tue, 7 Apr 2026 10:34:46 +0000 (UTC) writes:

  [...]

    > Finally, I think the change of

    >           as.POSIXlt(value)

    > to

    >    if(inherits(value, "POSIXlt") && identical(tz, attr(value, "tzone")))
    >        value
    >    else as.POSIXlt(as.POSIXct(value), tz = tz[1L]))

    > in '[<-.POSIXlt' and '[[<-.POSIXlt', which is the core of PR#18919, deserves a NEWS item mentioning time zone. For example,
    > In subassigning 'val' to a POSIXlt object 'x', x[i] <- val and x[[i]] <- val, now 'val' is converted to the time zone of 'x'.

Yes, you are right; I will add this to the (relatively old) NEWS of R 4.5.2 ..

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