I'm writing a specification for a language (the Call Processing Language, for user-specific routing of telephone calls) which needs to support the users' time zones for time-of-day routing. (The current draft is available at <http://www.cs.columbia.edu/~lennox/draft-ietf-iptel-cpl-07.txt> for those who are interested.) The draft includes the following paragraph: While "tzid" labels that do not begin with a forward slash are locally defined, it is RECOMMENDED that servers support at least the naming scheme used by Olson Time Zone database [9]. Examples of timezone databases that use the Olson scheme are the zoneinfo files on most Unix-like systems, and the standard Java TimeZone class. Currently reference [9] refers to <http://www.twinsun.com/tz/tz-link.htm>, which is tz-link.htm from tzcode. I've been asked, though, whether this is the best way to make reference to the TZ database; and I have to concede that it might not be, since it's dependent on Twinsun's continuing support. What would mailing list members suggest is the best (most canonical, most stable) way of referencing the TZ database? -- Jonathan Lennox lennox at cs dot columbia dot edu