'[Rd] The presence/absence of `zone` in POSIXlt depending on time zone as a cause of possible inconsi'

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List:       r-devel
Subject:    [Rd] The presence/absence of `zone` in POSIXlt depending on time zone as a cause of possible inconsi
From:       IAGO_GINÉ_VÁZQUEZ <i.gine () pssjd ! org>
Date:       2020-10-23 17:03:37
Message-ID: AM6PR02MB44230E9118756F38C48381F8921A0 () AM6PR02MB4423 ! eurprd02 ! prod ! outlook ! com
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Dear all,

I have just detected what seems a minor inconsistence with data types. If one unlists \
a POSIXlt time with GMT zone gets a numeric vector, since the POSIXlt list has no \
`zone` element, while if one unlists a POSIXlt time with a non GMT zone (also non \
specifying tz if the Sys.timezone is not GMT) gets a character vector due to \
including the `zone` element.

> x <- as.POSIXlt(Sys.time(), "GMT")
> (y <- unlist(x))
      sec       min      hour      mday       mon      year      wday      yday     \
isdst  54.99715  26.00000  16.00000  23.00000   9.00000 120.00000   5.00000 296.00000 \
0.00000
> str(y)
 Named num [1:9] 55 26 16 23 9 ...
 - attr(*, "names")= chr [1:9] "sec" "min" "hour" "mday" ...

> x <- as.POSIXlt(Sys.time(), "CET")
> (y <- unlist(x))
               sec                min               hour               mday           \
mon               year               wday               yday "19.5111262798309"       \
"27"               "18"               "23"                "9"              "120"      \
"5"              "296"  isdst               zone             gmtoff
               "1"             "CEST"             "7200"
> str(y)
 Named chr [1:11] "19.5111262798309" "27" "18" "23" "9" "120" "5" "296" "1" "CEST" \
                "7200"
 - attr(*, "names")= chr [1:11] "sec" "min" "hour" "mday" ...

Is it expected? Why do not include always `zone` as an element of POSIXlt? Should \
POSIXlt objects be unlisted in a different way? Thank you!
Best regards,

Iago

PS: I was using R 4.0.3. I don't know if this behaviour already changed in R-devel. \
Excuse me in that case.

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