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.
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.
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.
On 2019-09-07 03:36, Alois Treindl wrote:
On 07.09.19 11:29, Alois Treindl wrote:
Changes to past and future time zone abbreviations
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". And in Canada, AST stands for Atlantic Standard Time, 4h west of GMT
It appears Atlantic standard time was used in Canada prior to 1888, as that was standardized and named in PEI legislation that (regnal) year in the linked article below. J.RASC Vol.XXVI, No.2, Whole No.211, February, 1932, pp.49-77, Standard Time and Time Zones in Canada, C.C.Smith, Dominion Observatory, Ottawa, Jun, 1931, pp.76-77 gives the Provincial and Territorial legal references for time zones and daylight times across Canada, following the end of the federal 1918 Daylight Saving Act which lapsed at the end of that year. http://adsabs.harvard.edu/full/1932JRASC..26...49S http://articles.adsabs.harvard.edu/cgi-bin/nph-iarticle_query?1932JRASC..26.... For PEI, the enacting Statute 52 Victoria, Chap.11, Sec.1 defining time at the 60th meridian as Atlantic standard time, passed in 1888-9 in the 52nd year of Victoria's reign; the New Brunswick Interpretation Act 1903 standarized on 60W; in NWT and Quebec, 68W and points east were standardized on GMT-4. The part of the Standard Times tables on p.61 designates Atlantic and enumerates the countries and islands observing that standard, and is taken by permission from the UK Nautical Almanac (of 1930 or 1931). Provincial legislation passed in the 1920s also allowed provincial Lieutenant Governors in Council to pass Orders in Council, limiting the application of regulations as to time and place, as regarding daylight saving time when requested by municipalities, and in 1930 that was in effect only in Halifax, NS, St.John, NB, Regina, SK, municipalities in S.ON and Quebec between Quebec City and Windsor, ON; not in PEI, MB, AB, BC. -- Take care. Thanks, Brian Inglis, Calgary, Alberta, Canada This email may be disturbing to some readers as it contains too much technical detail. Reader discretion is advised.
On Sat, 7 Sep 2019, 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
The majority of these zones were changed to eliminate zone abbreviations that were invented by the TZ project itself, rather than resulting from any real-world usage. As I remember, ambiguity was not a factor (as there are still ambiguous abbreviations today).
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.
!DSPAM:5d7378ac119021727852487!
+--------------------+--------------------------+-----------------------+ | Paul Goyette | PGP Key fingerprint: | E-mail addresses: | | (Retired) | FA29 0E3B 35AF E8AE 6651 | paul@whooppee.com | | Software Developer | 0786 F758 55DE 53BA 7731 | pgoyette@netbsd.org | +--------------------+--------------------------+-----------------------+
Date: Sat, 7 Sep 2019 06:06:45 -0700 (PDT) From: Paul Goyette <paul@whooppee.com> Message-ID: <Pine.NEB.4.64.1909070603320.22622@speedy.whooppee.com> | The majority of these zones were changed to eliminate zone abbreviations | that were invented by the TZ project itself, rather than resulting from | any real-world usage. That's the explanation, though since they were invented (decades ago now) many of them became quite popular, and now have vanished. That's a pity. | As I remember, ambiguity was not a factor (as | there are still ambiguous abbreviations today). That's certainly correct - those things have never been useful for anything other than comfort for humans. Ambiguity is irrelevant (your average person will "just know" whether an "AST" that they see refers to North America, or the Middle East, from the context.) kre
participants (5)
-
Alois Treindl -
Brian Inglis -
Elena Sharovar -
Paul Goyette -
Robert Elz