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

[Sam Albers]

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

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