This is a rope. Don't push it. Been there, been swatted.
The current structure of R cannot support vectors of POSIXt timestamps
that have different tzones in different elements. You can keep a parallel
vector of tzones separately and manage environment variable TZ as needed
if you really must handle each timestamp in a different time zone.
By the way, count yourself lucky that c() works with POSIXlt at all, since
POSIXlt is a list of vectors. My practice is to store data in POSIXct
pretty much exclusively, reserving POSIXlt for temporary time
manipulations only.
On Mon, 23 Jun 2014, 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"
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