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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