[tz] Time zone abbreviations

[Alois Treindl]

And in Canada, AST stands for Atlantic Standard Time, 4h west of GMT

See file northamerica

> # From Alain LaBonté (1994-11-14):
> # I post here the time zone abbreviations standardized in Canada
> # for both English and French in the CAN/CSA-Z234.4-89 standard....
> #
> #       UTC     Standard time   Daylight saving time
> #       offset  French  English French  English
> #       -2:30   -       -       HAT     NDT
> #       -3      -       -       HAA     ADT
> #       -3:30   HNT     NST     -       -
> #       -4      HNA     AST     HAE     EDT
> #       -5      HNE     EST     HAC     CDT
> #       -6      HNC     CST     HAR     MDT
> #       -7      HNR     MST     HAP     PDT
> #       -8      HNP     PST     HAY     YDT
> #       -9      HNY     YST     -       -
> #
> #       HN: Heure Normale       ST: Standard Time
> #       HA: Heure Avancée       DT: Daylight saving Time
> #
> #       A: de l'Atlantique      Atlantic
> #       C: du Centre            Central
> #       E: de l'Est             Eastern
> #       M:                      Mountain
> #       N:                      Newfoundland
> #       P: du Pacifique         Pacific
> #       R: des Rocheuses
> #       T: de Terre-Neuve
> #       Y: du Yukon             Yukon

On 07.09.19 11:29, Alois Treindl wrote:
>
> I think the change was made because many abbreviations were ambiguous.
> In the US, AST is commonly used for Standard Alaska Time, 10h west of GMT.
>
> See the entry in file NEWS of Release 2017a - 2017-02-28 00:05:36 -0800
>
>>   Changes to past and future time zone abbreviations
>>
>>     Switch to numeric time zone abbreviations for South America, as
>>     part of the ongoing project of removing invented abbreviations.
>>     This avoids the need to invent an abbreviation for the new Chilean
>>     new zone.  Similarly, switch from invented to numeric time zone
>>     abbreviations for Afghanistan, American Samoa, the Azores,
>>     Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
>>     Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
>>     Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
>>     Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
>>     the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
>>     Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
>>     Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
>>     Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
>>     Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
>>     Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
>>     for half-hour daylight saving time in Belize before 1944 and in
>>     the Dominican Republic before 1975; and for Canary Islands before
>>     1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
>>     Indian Summer Time before 1942, for Indonesia before around 1964,
>>     for Kenya before 1960, for Liberia before 1973, for Madeira before
>>     1967, for Namibia before 1943, for the Netherlands in 1937-9, for
>>     Pakistan before 1971, for Western Sahara before 1977, and for
>>     Zaporozhye in 1880-1924.
>>
>>     For Alaska time from 1900 through 1967, instead of "CAT" use the
>>     abbreviation "AST", the abbreviation commonly used at the time
>>     (Atlantic Standard Time had not been standardized yet).  Use "AWT"
>>     and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
>
> On 07.09.19 07:15, Elena Sharovar wrote:
>> Hi Iana Team,
>>
>> where can I find some explanation why in 2017a format changed from 
>> AST to +03?
>> and the same happened in a lot of timezones (letter abbreviations 
>> changed to +03, +02, etc.)
>>
>> // 2016j
>> Zone Asia/Riyadh 3:06:52 - LMT 1947 Mar 14
>> 3:00 -*AST*
>>
>> //  2017a
>> Zone Asia/Riyadh 3:06:52 - LMT 1947 Mar 14
>> 3:00 - *+03*
>>
>> Thanks & Regards,
>> Elena.
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