[tz] [PATCH] tzdata: Asia/Ha_Noi: Add new timezone
Trần Ngọc Quân
vnwildman at gmail.com
Sun Oct 5 02:25:55 UTC 2014
On 05/10/2014 07:32, Paul Eggert wrote:
> Tim Parenti wrote:
>> ... ICT referring to different UT offsets for several periods.
>> Perhaps, prior to
>> reunification, NICT and SICT should be used for "North/South
>> Indochina Time"?
> It wasn't North vs South. The new data say that French Indochina
> mostly used UT+7, but sometimes all of French Indochina used UT+8,
> sometimes just South Vietnam, sometimes more of a hodgepodge. I had
> independently run into this problem and thought of using the
> abbreviation "IDT" (short for InDochina Time) for UT+8 in Indochina to
> help clear this up.
I agree with you.
> There's a bigger problem, though. The new data also tell us that our
> entries for Laos and Cambodia are almost entirely bogus. We already
> knew that, and I had slated them for 'backzone' anyway, so now's a
> good time to do that. As a corollary, although we clearly need to fix
> Asia/Ho_Chi_Minh, we don't need a separate Zone for Asia/Hanoi as it
> is identical to Asia/Bangkok since 1970. This will give us a simpler
> fix and an easier-to-maintain result.
> A proposed pair of patches is attached. The first moves the bogus
> data for Cambodia and Laos to 'backzone'. The second fixes
> Asia/Ho_Chi_Minh and adds a line to zone1970.tab so that users in
> Vietnam now have two choices, one for each half of the country.
About second patch:
+Zone Asia/Ho_Chi_Minh 7:06:40 - LMT 1906 Jul 1
+ 7:06:30 - PLMT 1911 May 1
+ 7:00 - ICT 1942 Dec 31 23:00
+ 8:00 - IDT 1945 Mar 14 23:00
+ 9:00 - JST 1945 Sep 2
+ 7:00 - ICT 1947 Apr 1
+ 8:00 - IDT 1955 Jul 1
+ 7:00 - ICT 1959 Dec 31 23:00
+ 8:00 - IDT 1975 Jun 13
7:00 - ICT
This is Hanoi, not Ho Chi Minh City.
I find an other book about this topic:
Name: Lịch âm dương Việt Nam 1900-2010
Author: Nguyễn Văn Chung
Publisher: Nhà xuất bản văn hóa dân tộc
- It confirms the date `1906 Jul 1'. So I think this date is correct.
- It said Phù Liễn is 104°17’17” East. But I think `east of Paris' is
correct. In Google map, it is: 20°47'05.1"N+106°38'22.0"E
Unfortunately, It don't show any other information that we need.
Some photos about Phù Liễn:
Trần Ngọc Quân.
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