IATA Timezone Codes
IATA timezone is a country or a part of a country, where local time is the same. IATA timezone code is constructed of 2-4 characters (letters an digits) as follows:
- ISO 3166-1 alpha-2 country code is always used as first and second characters of time zone code.
- If country is not divided into separate time zones - no more characters added. Just 2 characters used.
- If country is divided into time zones - 3rd character of time zone code is a digit - number of time zone in country. Note: Russia is divided into 11 timezones, so number of time zone in country is specified by 2 digits - RU01, RU02, ... RU11.
- If some territories have the same local time, but different rules on Daylight saving time, - a letter can be added as 4th character to make unique codes for all such territories.
Example: Time zone code AU2 is used for Australian states New South Wales and Victoria (local time is UTC + 10 hours, DST begins at end of October). Time zone code AU2A is used for Tasmania (local time is UTC + 10 hours, DST begins at end of September). Time zone code AU2B is used for Queensland (local time is UTC + 10 hours, no DST).
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