eggert/tz — pull request #8 by chitsaou (2014-07-02 14:58:33+00:00)
Title: Correct DST in Asia/Taipei

Hi,

I'm Yu-Cheng Chuang who talked about some time zone things in Taiwan during WW2 on the mailing list.

I've read through all the government announcements about DST from official websites [1][2] and found that the most-cited CWB (Central Weather Bureau) page didn't have the most correct info.

In 1947, DST in Taiwan was expanded to Oct 31. It were originally planned to be from Apr 15 until Sep 20, however it was expanded to Oct 31 for "saving (energy?) consumption". [3]

So it was not adopted form May 1, but from Apr 15. Also, it was expanded until Oct 31, not Sep 30 as originally planned.

In addition, I've also corrected the DST in 1979, which was adopted from Jul 1 until Sep 30. This part is correct in CWB's webpage, so I believe it was just a typo. I fixed it.

However, it is weird that I cannot found any announcement about DST in 1946. Taiwan was returned to Republic of China so there should be an announcement, just like each other years. I'll ask for the National Library about it.

Here is all the info I can found from the historical announcement system:

| ROC | Year | start | end | go back |
|-----|------|------|-------|------|
| 36 | 1947 | 4/15 | 10/31 | 11/1 |
| 37 | 1948 | 5/1 | 9/30 | 10/1 |
| 38 | 1949 | 5/1 | 9/30 | 10/1 |
| 39 | 1950 | 5/1 | 9/30 | 10/1 |
| 40 | 1951 | 5/1 | 9/30 | 10/1 |
| 41 | 1952 | 3/1 | 10/31 | 11/1 |
| 42 | 1953 | 4/1 | 10/31 | 11/1 |
| 43 | 1954 | 4/1 | 10/31 | 11/1 |
| 44 | 1955 | 4/1 | 9/30 | 10/1 |
| 45 | 1956 | 4/1 | 9/30 | 10/1 |
| 46 | 1957 | 4/1 | 9/30 | 10/1 |
| 47 | 1958 | 4/1 | 9/30 | 10/1 |
| 48 | 1959 | 4/1 | 9/30 | 10/1 |
| 49 | 1960 | 6/1 | 9/30 | 10/1 |
| 50 | 1961 | 6/1 | 9/30 | 10/1 |
| 51 | 1962 | - | - | - |
| 52 | 1963 | - | - | - |
| 53 | 1964 | - | - | - |
| 54 | 1965 | - | - | - |
| 55 | 1966 | - | - | - |
| 56 | 1967 | - | - | - |
| 57 | 1968 | - | - | - |
| 58 | 1969 | - | - | - |
| 59 | 1970 | - | - | - |
| 60 | 1971 | - | - | - |
| 61 | 1972 | - | - | - |
| 62 | 1973 | - | - | - |
| 63 | 1974 | 4/1 | 9/30 | 10/1 |
| 64 | 1975 | 4/1 | 9/30 | 10/1 |
| 65 | 1976 | - | - | - |
| 66 | 1977 | - | - | - |
| 67 | 1978 | - | - | - |
| 68 | 1979 | 7/1 | 9/30 | 10/1 |

I hope I got the correct format of TZ database. If anything is wrong, feel free to correct.

Thanks!

[1]: Taiwan Province Government Bulletin Search System: http://subtpg.tpg.gov.tw/og/q1.asp
[2]: National Central Library Gazette Online: http://gaz.ncl.edu.tw/
[3]: http://subtpg.tpg.gov.tw/og/image2.asp?f=0360310AKZ431