How can I access, either to get or set, the "sec", "min", "hour",
.... fields of a POSIXlt value as in this example?
> t= as.POSIXlt("2004-11-01")
> t
[1] "2004-11-01"
> unclass(t)
$sec
[1] 0
$min
[1] 0
$hour
[1] 0
$mday
[1] 1
$mon
[1] 10
$year
[1] 104
$wday
[1] 1
$yday
[1] 305
$isdst
[1] -1