[R] Unable to return gmtoff from as.POSIXlt without converting date string to as.POSIXct first

[Jeff Newmiller]

Read

?DateTimeClasses

regarding gmtoff. In short, it is implementation-dependent.

On June 28, 2018 10:58:13 AM PDT, Sam Albers <tonightsthenight using gmail.com> wrote:
>Is it possible for someone to explain what is going on here? I would
>expect
>that `as.POSIXlt` would be able to accept `datestring` and return all
>the
>elements without having to convert it using `as.POSIXct` first. Do
>`as.POSIXlt` and `as.POSIXct` do different things with the `tz` arg?
>
>datestring <- "2017-01-01 12:00:00"
>foo <- as.POSIXlt(datestring, tz = "America/Moncton")
>foo
>[1] "2017-01-01 12:00:00 AST"
>foo$gmtoff
>[1] NA
>
>bar <- as.POSIXlt(as.POSIXct(datestring, tz = "America/Moncton"))
>bar
>[1] "2017-01-01 12:00:00 AST"
>bar$gmtoff
>[1] -14400
>
>Thanks in advance,
>
>Sam
>
>	[[alternative HTML version deleted]]
>
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-- 
Sent from my phone. Please excuse my brevity.