"Mark Davis" <mark.davis at jtcsv.com> writes: > it sounds like Olson zone identifier or maybe Olson time zone > identifier? RFC 2445 calls these sorts of things TZIDs, so perhaps "Olson TZID"? Or if you want to spell out "identifier", then "Olson TZ identifier"? They are used as values of the TZ environment variable, so "TZ" has a good pedigree.