[R] c() with POSIXlt objects and their timezone is lost

[Uwe Ligges]

On 23.06.2014 23:52, Marc Girondot wrote:
> When two POSIXlt objects are combine with c(), they lost their tzone
> attribute, even if they are the same.
> I don't know if it is a feature, but I don't like it !
>
> Marc
>
>  > es <- strptime("2010-02-03 10:20:30", format="%Y-%m-%d %H:%M:%S",
> tz="UTC")
>  > es
> [1] "2010-02-03 10:20:30 UTC"
>  > attributes(es)
> $names
> [1] "sec"   "min"   "hour"  "mday"  "mon"   "year"  "wday"  "yday" "isdst"
>
> $class
> [1] "POSIXlt" "POSIXt"
>
> $tzone
> [1] "UTC"
>
>  > c(es, es)
> [1] "2010-02-03 11:20:30 CET" "2010-02-03 11:20:30 CET"
>  > attributes(c(es, es))
> $names
>   [1] "sec"    "min"    "hour"   "mday"   "mon"    "year"   "wday"
> "yday"   "isdst"  "zone"   "gmtoff"
>
> $class
> [1] "POSIXlt" "POSIXt"
>
> $tzone
> [1] ""     "CET"  "CEST"




 From ?c:

"c is sometimes used for its side effect of removing attributes [...]"

and from ?c.POSIXlt:


"Using c on "POSIXlt" objects converts them to the current time zone, [...]"

Best,
Uwe Ligges



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