[tz] Philippines DST

P Chan legco at outlook.com
Sun May 16 18:23:53 UTC 2021


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-order-no-17-s-1990/

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


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