"Eastern Standard Time, 5 hours behind Greenwich), PST8 (i.e. The POSIX format allows the US timezones to be represented as EST5 (i.e. POSIX is part of UNIX, which was developed in the USA, which is behind UTC (west of Greenwich).Possible reasons for POSIX timezone definition The ISO 8601 convention has become the effective standard nowadays, making POSIX timezones look confusing to some readers. Examples: "+03:00" in ISO 8601 equals GMT-3 in POSIX "−05" in ISO 8601 equals "GMT5" in POSIX. In the ISO 8601 timezone format, negative signs indicate that a zone is behind UTC (west of Greenwich) and positive signs indicate a zone is ahead of UTC (east of Greenwich). This POSIX convention is the opposite of the definition for timezones in the nowadays widespread and mostly used ISO 8601. POSIX has positive signs for zones that are behind Greenwich (west of Greenwich) and negative signs for zones that are ahead of Greenwich (east of Greenwich). GMT+4, GMT-8), the tz database uses POSIX-style signs in the zone-names. Note on tz database and POSIX timezonesįor administrative timezones other than UTC (e.g. In summary: To conform with the naming convention, the universal coordinated time(zone) is named Etc/UTC in the tz database. Area Etc applies mainly to administrative timezones such as UTC. Thus, the special Area Etc ( Etcetera) was introduced. "Europe", resulting in "Europe/Berlin"), some timezones cannot be attributed to any Area of the world (think continents or oceans). "Berlin") can be attributed to an area (e.g. Long answer with contextĮtc/UTC is a timezone in the Olson-timezone-database ( tz database), also known as IANA-timezones-database, in which all timezones conform to a uniform naming convention: Area/Location. NO, there is no difference between time zones UTC and Etc/UTC.
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