unknown timezone name in R strptime/as.POSIXct

Question

Where can I find a list of all legal time names for R function as.POSIXct?

as.POSIXct(\"1970-01-01\",tz=\"CST\") generates a warning that \

Answer 1

Most R platforms use the time-zone database compiled by David Olson, where the preferred reference is by location. There names are a bit outdated but they will help you get going.

Find a full list of available time zones (doesn't work on windows):

OlsonNames()

For folks running windows that OlsonNames() doesn't work: See the full list here.

Or read up in more detail here http://www.twinsun.com/tz/tz-link.htm