can you add Philippine Daylight Time on your Database I think it was missing from the list of the time zones please reply immediately if solved thanks...
On Mon, 10 May 2021 at 06:36, Cool Gab19 via tz <tz@iana.org> wrote:
can you add Philippine Daylight Time on your Database I think it was missing from the list of the time zones please reply immediately if solved thanks...
Our Asia/Manila zone implements DST for the Philippines on a few occasions in its history; namely, 1936–1937, 1954, and 1978. It also implements a year-round forward shift of the clocks by one hour from early 1942 through late 1944. For some of these, we do not have exact transition times, so if you have any better information, we'd love to hear it. Our commentary does also mention that DST may have been used in the Philippines at some point in the 1990s, but we don't have any details about how or when this was implemented, so we've had to leave it out for now. You can see our current data and commentary on the Philippines here… https://github.com/eggert/tz/blob/6860c875400b70be52c71d7b7b9642b8667a8112/a... and learn more about how to interpret this file here… https://ftp.iana.org/tz/tz-how-to.html If there's anything specific we should consider adding to this zone, particularly as it relates to DST in the Philippines in the 1990s, please provide as much detail as you're able. Help us further document with reliable sources, preferably a link to archived legislation/decrees or news articles from the time in question which detailed the change for the general public. -- Tim Parenti
Here's a fairly comprehensive article in Japanese: https://wiki.suikawiki.org/n/Philippine%20Time
On 5/10/21 8:36 AM, P Chan via tz wrote:
Here's a fairly comprehensive article in Japanese: https://wiki.suikawiki.org/n/Philippine%20Time
Thanks, I installed the attached (unfortunately with a misspelling in the commit message).
On Mon, 10 May 2021 at 21:26, Paul Eggert <eggert@cs.ucla.edu> wrote:
On 5/10/21 8:36 AM, P Chan via tz wrote:
Here's a fairly comprehensive article in Japanese: https://wiki.suikawiki.org/n/Philippine%20Time
Thanks, I installed the attached (unfortunately with a misspelling in the commit message).
P Chan— Thanks for that source. Although that article seems to cite us a bit, I do see that it has some information on DST dates in 1990 as well as possibly some better sourcing for our other dates. If you have some time or inclination to tease out some of these specifics and/or translate the relevant parts to English, that would be quite helpful. In the meantime, I'll add this to my growing queue for historical data — I've been working on extensive historical changes for Portugal for a while now based on: https://mm.icann.org/pipermail/tz/2021-February/029778.html I hope to have that ready soon, since we have only partial changes for Portugal staged now. I also haven't forgotten to come back to your prior threads "Some time zone history (3)" and "(4)". -- Tim Parenti
Thanks for the update. On Mon, May 10, 2021 at 7:17 PM Tim Parenti <tim@timtimeonline.com> wrote:
On Mon, 10 May 2021 at 21:26, Paul Eggert <eggert@cs.ucla.edu> wrote:
On 5/10/21 8:36 AM, P Chan via tz wrote:
Here's a fairly comprehensive article in Japanese: https://wiki.suikawiki.org/n/Philippine%20Time
Thanks, I installed the attached (unfortunately with a misspelling in the commit message).
P Chan— Thanks for that source. Although that article seems to cite us a bit, I do see that it has some information on DST dates in 1990 as well as possibly some better sourcing for our other dates. If you have some time or inclination to tease out some of these specifics and/or translate the relevant parts to English, that would be quite helpful.
In the meantime, I'll add this to my growing queue for historical data — I've been working on extensive historical changes for Portugal for a while now based on: https://mm.icann.org/pipermail/tz/2021-February/029778.html I hope to have that ready soon, since we have only partial changes for Portugal staged now. I also haven't forgotten to come back to your prior threads "Some time zone history (3)" and "(4)".
-- Tim Parenti
Although my knowledge of Japanese is very limited, I will try to extract some relevant parts form the article and give some other sources. According to the references listed in the article, the periods that the Philippines (Manila) observed DST or used +9 are: 1936-10-31 24:00 to 1937-01-15 24:00 (Proclamation No. 104, Proclamation No. 126) 1941-12-15 24:00 to 1945-11-30 24:00 (Proclamation No. 789, Proclamation No. 20) 1954-04-11 24:00 to 1954-06-04 24:00 (Proclamation No. 13, Proclamation No. 33) 1977-03-27 24:00 to 1977-09-21 24:00 (Proclamation No. 1629, Proclamation No. 1641) 1990-05-21 00:00 to 1990-07-28 24:00 (National Emergency Memorandum Order No. 17, Executive Order No. 415) Proclamation No. 104, s. 1936 - Signed on October 30, 1936 https://www.officialgazette.gov.ph/1936/10/30/proclamation-no-104-s-1936/ Proclamation No. 126. s. 1937 - Signed on January 15, 1937 https://www.officialgazette.gov.ph/1937/01/15/proclamation-no-126-s-1937/ Proclamation No. 789, s. 1941 - Signed on December 13, 1941 https://www.officialgazette.gov.ph/1941/12/13/proclamation-no-789-s-1941/ Proclamation No. 20, s. 1945 - Signed on November 11, 1945 https://www.officialgazette.gov.ph/1945/11/11/proclamation-no-20-s-1945/ Proclamation No. 13, s. 1954 - Signed on April 6, 1954 https://www.officialgazette.gov.ph/1954/04/06/proclamation-no-13-s-1954/ Proclamation No. 33, s. 1954 - Signed on June 3, 1954 https://www.officialgazette.gov.ph/1954/06/03/proclamation-no-33-s-1954/ Proclamation No. 1629, s. 1977 - Signed on March 25, 1977 https://www.officialgazette.gov.ph/1977/03/25/proclamation-no-1629-s-1977/ Proclamation No. 1641, s. 1977 - Signed on May 26, 1977 https://www.officialgazette.gov.ph/1977/05/26/proclamation-no-1641-s-1977/ National Emergency Memorandum Order No. 17, s. 1990 - Signed on May 2, 1990 https://www.officialgazette.gov.ph/1990/05/02/national-emergency-memorandum-... Executive Order No. 415, s. 1990 - Signed on July 20, 1990 https://www.officialgazette.gov.ph/1990/07/20/executive-order-no-415-s-1990/ During WWII, Proclamation No. 789 fixed two periods of DST. The first period was set to continue only until January 31, 1942. But Manila was occupied by the Japanese earlier in the month. According to the data from The Nautical Almanac and The Air Almanac, DST was observed in 1977 but not in 1978. https://books.google.com/books?id=Ub5Yi0357WAC&pg=SL1-PA21 https://books.google.com/books?id=XryQ6CrcE4EC&pg=PA263 https://books.google.com/books?id=E--3AAAAIAAJ&pg=SL1-PA21 https://books.google.com/books?id=2OIvjW_sHhoC&pg=SL1-PA21 https://books.google.com/books?id=6xEJAQAAIAAJ&pg=RA5-PA22-IA1 https://books.google.com/books?id=PfWDvqFgQfYC&pg=SL1-PA21 For the date of the adoption of standard time, Shank gives 1899-05-11. The article is not able to state the basis of that. I guess it was based on a US War Department Circular issued on that date. https://books.google.com/books?id=JZ1PAAAAYAAJ&pg=RA3-PA8 However, according to other sources, standard time was adopted on 1899-09-06. Also, the LMT was GMT+8:03:52 https://books.google.com/books?id=MOYIAQAAIAAJ&pg=PA521 https://books.google.com/books?id=lSnqqatpYikC&pg=PA21
On 2021-05-16 11:23, P Chan wrote:
Although my knowledge of Japanese is very limited, I will try to extract some relevant parts form the article and give some other sources.
Thanks for all that work. Prompted by Steffen Thorsen's Monday email[1] that the Philippines might reintroduce daylight saving time, I finally got around to looking into your 2021 email. I came up with the attached patch and installed it into the development sources. Something like this should appear in the next release. [1]: https://lists.iana.org/hyperkitty/list/tz@iana.org/thread/MGFR5P2CB4SOIUZ3MA...
* asia (Phil): Fix typo in my 2024-09-05 patch to improve pre-1991 data for the Philippines. The abbreviation for current Philippine Standard Time is PST, not PDT. --- asia | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/asia b/asia index 32c52860..d4eb0580 100644 --- a/asia +++ b/asia @@ -3760,7 +3760,7 @@ Rule Phil 1954 only - Jun 4 24:00 0 S Rule Phil 1977 only - Mar 27 24:00 1:00 D Rule Phil 1977 only - Sep 21 24:00 0 S Rule Phil 1990 only - May 21 0:00 1:00 D -Rule Phil 1990 only - Jul 28 24:00 0 D +Rule Phil 1990 only - Jul 28 24:00 0 S # Zone NAME STDOFF RULES FORMAT [UNTIL] Zone Asia/Manila -15:56:08 - LMT 1844 Dec 31 8:03:52 - LMT 1899 Sep 6 4:00u -- 2.43.0
participants (4)
-
Cool Gab19 -
P Chan -
Paul Eggert -
Tim Parenti