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<p><tt>I think the change was made because many abbreviations were
ambiguous.<br>
In the US, AST is commonly used for Standard Alaska Time, 10h
west of GMT.</tt></p>
<p><tt>See the entry in file NEWS of Release 2017a - 2017-02-28
00:05:36 -0800</tt></p>
<p><tt></tt>
<blockquote type="cite"> Changes to past and future time zone
abbreviations<br>
<br>
Switch to numeric time zone abbreviations for South America,
as<br>
part of the ongoing project of removing invented
abbreviations.<br>
This avoids the need to invent an abbreviation for the new
Chilean<br>
new zone. Similarly, switch from invented to numeric time
zone<br>
abbreviations for Afghanistan, American Samoa, the Azores,<br>
Bangladesh, Bhutan, the British Indian Ocean Territory,
Brunei,<br>
Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is,
Cook Is,<br>
Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,<br>
Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie,
Malaysia,<br>
the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,<br>
Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I,
Palau,<br>
Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion,
St<br>
Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles,
Singapore,<br>
Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis &
Futuna, and<br>
Xinjiang; for 20-minute daylight saving time in Ghana before
1943;<br>
for half-hour daylight saving time in Belize before 1944 and
in<br>
the Dominican Republic before 1975; and for Canary Islands
before<br>
1946, for Guinea-Bissau before 1975, for Iceland before
1969, for<br>
Indian Summer Time before 1942, for Indonesia before around
1964,<br>
for Kenya before 1960, for Liberia before 1973, for Madeira
before<br>
1967, for Namibia before 1943, for the Netherlands in
1937-9, for<br>
Pakistan before 1971, for Western Sahara before 1977, and
for<br>
Zaporozhye in 1880-1924.<br>
<br>
For Alaska time from 1900 through 1967, instead of "CAT" use
the<br>
abbreviation "AST", the abbreviation commonly used at the
time<br>
(Atlantic Standard Time had not been standardized yet). Use
"AWT"<br>
and "APT" instead of the invented abbreviations "CAWT" and
"CAPT".<br>
</blockquote>
<br>
</p>
<div class="moz-cite-prefix">On 07.09.19 07:15, Elena Sharovar
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAN17RT3q93KFcXhXKtLp2FRdG=As7ahdY5WJqc_9nDvuEF8K6A@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="ltr">Hi Iana Team,<br>
<br>
where can I find some explanation why in 2017a format changed
from AST to +03?<br>
and the same happened in a lot of timezones (letter
abbreviations changed to +03, +02, etc.)<br>
<br>
// 2016j<br>
Zone Asia/Riyadh 3:06:52 - LMT 1947 Mar 14<br>
3:00 -<b> AST</b><br>
<br>
// 2017a<br>
Zone Asia/Riyadh 3:06:52 - LMT 1947 Mar 14<br>
3:00 - <b>+03</b><br>
<br>
Thanks & Regards,<br>
Elena.</div>
</blockquote>
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