Analysis of information sources in references of the Wikipedia article "Tz database" in English language version.
The ECMAScript 2015 Internationalization API Specification identifies time zones using the Zone and Link names of the IANA Time Zone Database. Their canonical form is the corresponding Zone name in the casing used in the IANA Time Zone Database. ... It is recommended that implementations use the time zone information of the IANA Time Zone Database.
Each timezone typically corresponds to a geographical region that is smaller than a traditional time zone, because clocks in a timezone all agree after 1970 whereas a traditional time zone merely specifies current standard time. For example, applications that deal with current and future timestamps in the traditional North American mountain time zone can choose from the timezones America/Denver which observes US-style daylight saving time (DST), and America/Phoenix which does not observe DST. Applications that also deal with past timestamps in the mountain time zone can choose from over a dozen timezones, such as America/Boise, America/Edmonton, and America/Hermosillo, each of which currently uses mountain time but differs from other timezones for some timestamps after 1970.
Use only valid POSIX file name components (i.e., the parts of names other than '/'). Do not use the file name components '.' and '..'. Within a file name component, use only ASCII letters, '.', '-' and '_'. Do not use digits, as that might create an ambiguity with POSIX TZ strings. A file name component must not exceed 14 characters or start with '-'. E.g., prefer Asia/Brunei to Asia/Bandar_Seri_Begawan. Exceptions: see the discussion of legacy names below.
Keep locations compact. Use cities or small islands, not countries or regions, so that any future changes do not split individual locations into different timezones. E.g., prefer Europe/Paris to Europe/France, since France has had multiple timezones.
Here are the general guidelines used for choosing timezone names, in decreasing order of importance: ... If a name is ambiguous, use a less ambiguous alternative; e.g., many cities are named San José and Georgetown, so prefer America/Costa_Rica to America/San_Jose and America/Guyana to America/Georgetown. ... Use the most populous among locations in a region, e.g., prefer Asia/Shanghai to Asia/Beijing. Among locations with similar populations, pick the best-known location, e.g., prefer Europe/Rome to Europe/Milan.
If a name is changed, put its old spelling in the 'backward' file. This means old spellings will continue to work. Ordinarily a name change should occur only in the rare case when a location's consensus English-language spelling changes; for example, in 2008 Asia/Calcutta was renamed to Asia/Kolkata due to long-time widespread use of the new city name instead of the old.
Each timezone typically corresponds to a geographical region that is smaller than a traditional time zone, because clocks in a timezone all agree after 1970 whereas a traditional time zone merely specifies current standard time. For example, applications that deal with current and future timestamps in the traditional North American mountain time zone can choose from the timezones America/Denver which observes US-style daylight saving time (DST), and America/Phoenix which does not observe DST. Applications that also deal with past timestamps in the mountain time zone can choose from over a dozen timezones, such as America/Boise, America/Edmonton, and America/Hermosillo, each of which currently uses mountain time but differs from other timezones for some timestamps after 1970.
Use only valid POSIX file name components (i.e., the parts of names other than '/'). Do not use the file name components '.' and '..'. Within a file name component, use only ASCII letters, '.', '-' and '_'. Do not use digits, as that might create an ambiguity with POSIX TZ strings. A file name component must not exceed 14 characters or start with '-'. E.g., prefer Asia/Brunei to Asia/Bandar_Seri_Begawan. Exceptions: see the discussion of legacy names below.
Keep locations compact. Use cities or small islands, not countries or regions, so that any future changes do not split individual locations into different timezones. E.g., prefer Europe/Paris to Europe/France, since France has had multiple timezones.
Here are the general guidelines used for choosing timezone names, in decreasing order of importance: ... If a name is ambiguous, use a less ambiguous alternative; e.g., many cities are named San José and Georgetown, so prefer America/Costa_Rica to America/San_Jose and America/Guyana to America/Georgetown. ... Use the most populous among locations in a region, e.g., prefer Asia/Shanghai to Asia/Beijing. Among locations with similar populations, pick the best-known location, e.g., prefer Europe/Rome to Europe/Milan.
If a name is changed, put its old spelling in the 'backward' file. This means old spellings will continue to work. Ordinarily a name change should occur only in the rare case when a location's consensus English-language spelling changes; for example, in 2008 Asia/Calcutta was renamed to Asia/Kolkata due to long-time widespread use of the new city name instead of the old.
The ECMAScript 2015 Internationalization API Specification identifies time zones using the Zone and Link names of the IANA Time Zone Database. Their canonical form is the corresponding Zone name in the casing used in the IANA Time Zone Database. ... It is recommended that implementations use the time zone information of the IANA Time Zone Database.
