[R] as.POSIXlt, starting at 0 or 18000?

[Gabor Grothendieck]

This is what I get:

> unclass(strptime("1970-01-01", "%Y-%m-%d", tz="GMT") + 0)
[1] 0
attr(,"tzone")
[1] "GMT"
> unclass(strptime("1970-01-01", "%Y-%m-%d", tz="EST5EDT") + 0)
[1] 18000
attr(,"tzone")
[1] "EST5EDT"
> R.version.string # Windows Vista
[1] "R version 2.6.0 alpha (2007-09-06 r42791)"

so 1970-01-01 GMT is 0 and 1970-01-01 Eastern corresponds
to a GMT of 18000.

There is an article about dates and times in R News 4/1.

On 9/11/07, yoooooo <magno_yu at ml.com> wrote:
>
> Hi all,
>
>   I tried to do this:
>
> unclass(strptime("1970-01-01", "%Y-%m-%d", tz="") + 0)
> [1] 18000
>
>    I thought the starting time is zero? Same result returns if I do:
>
> unclass(strptime("1970-01-01", "%Y-%m-%d", tz="EDT") + 0)
> unclass(strptime("1970-01-01", "%Y-%m-%d", tz="EST") + 0)
> unclass(strptime("1970-01-01", "%Y-%m-%d", tz="GMT") + 0)
>
>    with LC_TIME=en_US;
>
>    Or they always start from 18000?
>
> Thanks,
> - yoooooo
>
> --
> View this message in context: http://www.nabble.com/as.POSIXlt%2C-starting-at-0-or-18000--tf4422770.html#a12615136
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