非洲/弗里敦在 PHP 中采用 UTC-00:53 的理由是什么？

问题描述 投票：0回答：1

PHP 对 

Africa/Freetown
时区的定义是怎么回事？从 1941 年开始，每年 12 月 31 日变为 
XXX UTC+00:40
，然后立即（同一秒）变回 
LMT UTC-00:53
（当地时间）。我尝试搜索 
UTC-00:53
的时区和 
Africa/Freetown
的时区，但我什至找不到任何提及它的内容，更不用说解释它了。弗里敦似乎是整个塞拉利昂的时区 (
UTC+00:00
)。 
Africa/Freetown
似乎也不是规范时区。它是否被错误地包含在规范时区中？

YAML 格式的数据

- ts: -9223372036854775808
  time: "-292277022657-01-27T08:29:52+0000"
  offset: -3180
  isdst: false
  abbr: LMT
- ts: -2776979220
  time: "1882-01-01T00:53:00+0000"
  offset: -3180
  isdst: false
  abbr: FMT
- ts: -1783120020
  time: "1913-07-01T00:53:00+0000"
  offset: -3600
  isdst: false
  abbr: "-01"
- ts: -1170284400
  time: "1932-12-01T01:00:00+0000"
  offset: -2400
  isdst: true
  abbr: "-0040"
- ts: -1159831200
  time: "1933-04-01T00:40:00+0000"
  offset: -3600
  isdst: false
  abbr: "-01"
- ts: -1146610800
  time: "1933-09-01T01:00:00+0000"
  offset: -2400
  isdst: true
  abbr: "-0040"
- ts: -1128295200
  time: "1934-04-01T00:40:00+0000"
  offset: -3600
  isdst: false
  abbr: "-01"
- ...
- ts: -957308400
  time: "1939-09-01T01:00:00+0000"
  offset: -2400
  isdst: true
  abbr: "-0040"
- ts: -956964000
  time: "1939-09-05T00:40:00+0000"
  offset: -3600
  isdst: false
  abbr: "-01"
- ts: -885769200
  time: "1941-12-07T01:00:00+0000"
  offset: 1200
  isdst: true
  abbr: "+01"
- ts: -883615200
  time: "1941-12-31T23:20:00+0000"
  offset: 2400
  isdst: false
  abbr: XXX
- ts: -883615200
  time: "1941-12-31T23:20:00+0000"
  offset: -3180
  isdst: false
  abbr: LMT
- ts: -852079200
  time: "1942-12-31T23:20:00+0000"
  offset: 2400
  isdst: false
  abbr: XXX
- ts: -852079200
  time: "1942-12-31T23:20:00+0000"
  offset: -3180
  isdst: false
  abbr: LMT
- ...
- ts: 2145914400
  time: "2037-12-31T23:20:00+0000"
  offset: 2400
  isdst: false
  abbr: XXX
- ts: 2145914400
  time: "2037-12-31T23:20:00+0000"
  offset: -3180
  isdst: false
  abbr: LMT

代码

$timezone = new DateTimeZone('Africa/Freetown');
var_dump($timezone->getTransitions());

部分输出

array(214) {
  [0]=>
  array(5) {
    ["ts"]=>
    int(-9223372036854775808)
    ["time"]=>
    string(33) "-292277022657-01-27T08:29:52+0000"
    ["offset"]=>
    int(-3180)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "LMT"
  }
  [1]=>
  array(5) {
    ["ts"]=>
    int(-2776979220)
    ["time"]=>
    string(24) "1882-01-01T00:53:00+0000"
    ["offset"]=>
    int(-3180)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "FMT"
  }
  [2]=>
  array(5) {
    ["ts"]=>
    int(-1783120020)
    ["time"]=>
    string(24) "1913-07-01T00:53:00+0000"
    ["offset"]=>
    int(-3600)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "-01"
  }
  [3]=>
  array(5) {
    ["ts"]=>
    int(-1170284400)
    ["time"]=>
    string(24) "1932-12-01T01:00:00+0000"
    ["offset"]=>
    int(-2400)
    ["isdst"]=>
    bool(true)
    ["abbr"]=>
    string(5) "-0040"
  }
  [4]=>
  array(5) {
    ["ts"]=>
    int(-1159831200)
    ["time"]=>
    string(24) "1933-04-01T00:40:00+0000"
    ["offset"]=>
    int(-3600)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "-01"
  }
  [5]=>
  array(5) {
    ["ts"]=>
    int(-1146610800)
    ["time"]=>
    string(24) "1933-09-01T01:00:00+0000"
    ["offset"]=>
    int(-2400)
    ["isdst"]=>
    bool(true)
    ["abbr"]=>
    string(5) "-0040"
  }
  [6]=>
  array(5) {
    ["ts"]=>
    int(-1128295200)
    ["time"]=>
    string(24) "1934-04-01T00:40:00+0000"
    ["offset"]=>
    int(-3600)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "-01"
  }
.
.
.
  [17]=>
  array(5) {
    ["ts"]=>
    int(-957308400)
    ["time"]=>
    string(24) "1939-09-01T01:00:00+0000"
    ["offset"]=>
    int(-2400)
    ["isdst"]=>
    bool(true)
    ["abbr"]=>
    string(5) "-0040"
  }
  [18]=>
  array(5) {
    ["ts"]=>
    int(-956964000)
    ["time"]=>
    string(24) "1939-09-05T00:40:00+0000"
    ["offset"]=>
    int(-3600)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "-01"
  }
  [19]=>
  array(5) {
    ["ts"]=>
    int(-885769200)
    ["time"]=>
    string(24) "1941-12-07T01:00:00+0000"
    ["offset"]=>
    int(1200)
    ["isdst"]=>
    bool(true)
    ["abbr"]=>
    string(3) "+01"
  }
  [20]=>
  array(5) {
    ["ts"]=>
    int(-883615200)
    ["time"]=>
    string(24) "1941-12-31T23:20:00+0000"
    ["offset"]=>
    int(2400)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "XXX"
  }
  [21]=>
  array(5) {
    ["ts"]=>
    int(-883615200)
    ["time"]=>
    string(24) "1941-12-31T23:20:00+0000"
    ["offset"]=>
    int(-3180)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "LMT"
  }
  [22]=>
  array(5) {
    ["ts"]=>
    int(-852079200)
    ["time"]=>
    string(24) "1942-12-31T23:20:00+0000"
    ["offset"]=>
    int(2400)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "XXX"
  }
  [23]=>
  array(5) {
    ["ts"]=>
    int(-852079200)
    ["time"]=>
    string(24) "1942-12-31T23:20:00+0000"
    ["offset"]=>
    int(-3180)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "LMT"
  }
.
.
.
  [212]=>
  array(5) {
    ["ts"]=>
    int(2145914400)
    ["time"]=>
    string(24) "2037-12-31T23:20:00+0000"
    ["offset"]=>
    int(2400)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "XXX"
  }
  [213]=>
  array(5) {
    ["ts"]=>
    int(2145914400)
    ["time"]=>
    string(24) "2037-12-31T23:20:00+0000"
    ["offset"]=>
    int(-3180)
    ["isdst"]=>
    bool(false)
    ["abbr"]=>
    string(3) "LMT"
  }
}
php timezone
1个回答
0
投票

答案可以在IANA时区数据中找到。在文件

backzone
中，说明了以下内容：

# Sierra Leone
# From P Chan (2020-12-09):
# Standard time of GMT-1 was adopted on 1913-07-01.  Twenty minutes of DST was
# introduce[d] in 1932 and was suspended in 1939.  In 1941, GMT was adopted by
# Defence Regulations.  This was made permanent in 1946.
#
# Government Notice No. 121 of 1913, 1913-06-06, Sierra Leone Royal Gazette,
# Vol. XLIV, No. 1384, 1913-06-14, p 347
# Alteration of Time Ordinance, 1932 (No. 34 of 1932) [1932-12-01]
# Alteration of Time (Amendment) Ordinance, 1938 (No. 25 of 1938) [1938-11-24]
# Defence Regulations (No. 9), 1939 (Regulations No. 9 of 1939), 1939-09-05
# Defence Regulations (No. 11), 1939 (Regulations No. 11 of 1939), 1939-09-27
# Defence (Amendment) (No. 17) Regulations, 1941 (Public Notice No. 157 of
# 1941), 1914-12-04
# Alteration of Time (Amendment) Ordinance, 1946 (No. 2 of 1946) [1946-02-07]

# From Tim Parenti (2021-03-02), per P Chan (2021-02-25):
# For Sierra Leone in 1957-1962, the standard time was defined in the
# Alteration of Time Ordinance, 1932 (as amended in 1946, renamed to Local Time
# Ordinance in 1960 and Local Time Act in 1961). It was unamended throughout
# that period.  See references to "Time" in the Alphabetical Index of the
# Legislation in force on the 31st day of December,
#   1957: https://books.google.com/books?id=lvQ-AQAAIAAJ&pg=RA2-PA49
#   1958: https://books.google.com/books?id=4fQ-AQAAIAAJ&pg=RA2-PA50
#   1959: https://books.google.com/books?id=p_U-AQAAIAAJ&pg=RA2-PA55
#   1960: https://books.google.com/books?id=JPY-AQAAIAAJ&pg=RA3-PA37
#   1961: https://books.google.com/books?id=7vY-AQAAIAAJ&pg=RA3-PA41
#   1962: https://books.google.com/books?id=W_c-AQAAIAAJ&pg=RA3-PA44
#   1963: https://books.google.com/books?id=9vk-AQAAIAAJ&pg=RA1-PA47
#
# Although Shanks & Pottenger had DST from Jun 1 00:00 to Sep 1 00:00 in this
# period, many contemporaneous almanacs agree that it wasn't used:
# https://mm.icann.org/pipermail/tz/2021-February/029866.html
# Go with the above.

Rule    SL  1932    only    -   Dec  1   0:00   0:20    -0040
Rule    SL  1933    1938    -   Mar 31  24:00   0   -01
Rule    SL  1933    1939    -   Aug 31  24:00   0:20    -0040
Rule    SL  1939    only    -   May 31  24:00   0   -01

Zone    Africa/Freetown -0:53:00 -  LMT 1882
            -0:53:00 -  FMT 1913 Jul  1 # Freetown MT
            -1:00   SL  %s  1939 Sep  5
            -1:00   -   -01 1941 Dec  6 24:00
             0:00   -   GMT

该文件充满了其他调整，旨在尝试反映某些时区的历史怪异现象。

请注意，PHP 的解释本身仍然可能存在奇怪之处，尤其是像这样深奥的东西。

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