See ?Sys.timezone, which help.search("timezone") points you to.
On Mon, 10 Nov 2008, stephen sefick wrote:
I have looked at
?as.POSIXct
That also links to Sys.timezone from the 'tz' argument.
?POSIXct
and many of the references that are on those pages.
I am bewildered with timezones. Is there a way to get what would go
into tz="" for making a function that uses POSIXct to be able to be
used in all of the timezones in just the united states? This is for
both windows and mac...
There are rather a lot of timezones in the United States (sic), down to
individual counties.
For both Windows (sic) and Mac OS (sic) R uses the Olsen database, and so
timezones are best specfied by "America/<city name>" for city names, plus
"America/Kentucky/{Louisville,Monticello}"
this is the function that I am wanting to use it with
library(maptools)
sunrise.set <- function(lat, long, date, timezone="UTC", num.days=1){
#this needs to be long lat#
lat.long <- matrix(c(long, lat), nrow=1)
day <- as.POSIXct(date, tz=timezone)
sequence <- seq(from=day, length.out=num.days , by="days")
sunrise <- sunriset(lat.long, sequence, direction="sunrise",
POSIXct=TRUE)
sunset <- sunriset(lat.long, sequence, direction="sunset", POSIXct=TRUE)
ss <- data.frame(sunrise, sunset)
ss <- ss[,-c(1,3)]
colnames(ss)<-c("sunrise", "sunset")
return(ss)
}
thanks in advance,
--
Stephen Sefick
Research Scientist
Southeastern Natural Sciences Academy
Let's not spend our time and resources thinking about things that are
so little or so large that all they really do for us is puff us up and
make us feel like gods. We are mammals, and have not exhausted the
annoying little problems of being mammals.
-K. Mullis
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