4 # This code is free software; you can redistribute it and/or modify it
5 # under the terms of the GNU General Public License version 2 only, as
6 # published by the Free Software Foundation. Oracle designates this
7 # particular file as subject to the "Classpath" exception as provided
8 # by Oracle in the LICENSE file that accompanied this code.
9 #
10 # This code is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 # version 2 for more details (a copy is included in the LICENSE file that
14 # accompanied this code).
15 #
16 # You should have received a copy of the GNU General Public License version
17 # 2 along with this work; if not, write to the Free Software Foundation,
18 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 #
20 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 # or visit www.oracle.com if you need additional information or have any
22 # questions.
23 #
24 # This file is in the public domain, so clarified as of
25 # 2009-05-17 by Arthur David Olson.
26
27 # also includes Central America and the Caribbean
28
29 # This file is by no means authoritative; if you think you know better,
30 # go ahead and edit the file (and please send any changes to
31 # tz@iana.org for general use in the future). For more, please see
32 # the file CONTRIBUTING in the tz distribution.
33
34 # From Paul Eggert (1999-03-22):
35 # A reliable and entertaining source about time zones is
36 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
37
38 ###############################################################################
39
40 # United States
41
42 # From Paul Eggert (1999-03-31):
43 # Howse writes (pp 121-125) that time zones were invented by
54 # work in the US was William Frederick Allen - railway engineer,
55 # managing editor of the Travelers' Guide, and secretary of the
56 # General Time Convention, a railway standardization group. Allen
57 # spent months in dialogs with scientific and railway leaders,
58 # developed a workable plan to institute time zones, and presented it
59 # to the General Time Convention on 1883-04-11, saying that his plan
60 # meant "local time would be practically abolished" - a plus for
61 # railway scheduling. By the next convention on 1883-10-11 nearly all
62 # railroads had agreed and it took effect on 1883-11-18. That Sunday
63 # was called the "day of two noons", as some locations observed noon
64 # twice. Allen witnessed the transition in New York City, writing:
65 #
66 # I heard the bells of St. Paul's strike on the old time. Four
67 # minutes later, obedient to the electrical signal from the Naval
68 # Observatory ... the time-ball made its rapid descent, the chimes
69 # of old Trinity rang twelve measured strokes, and local time was
70 # abandoned, probably forever.
71 #
72 # Most of the US soon followed suit. See:
73 # Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
74 # http://dx.doi.org/10.2307/3105430
75
76 # From Paul Eggert (2005-04-16):
77 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
78 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
79
80 # From Paul Eggert (2006-03-22):
81 # A good source for time zone historical data in the US is
82 # Thomas G. Shanks, The American Atlas (5th edition),
83 # San Diego: ACS Publications, Inc. (1991).
84 # Make sure you have the errata sheet; the book is somewhat useless without it.
85 # It is the source for most of the pre-1991 US entries below.
86
87 # From Paul Eggert (2001-03-06):
88 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
89 # in his whimsical essay "An Economical Project for Diminishing the Cost
90 # of Light" published in the Journal de Paris (1784-04-26).
91 # Not everyone is happy with the results:
92 #
93 # I don't really care how time is reckoned so long as there is some
94 # agreement about it, but I object to being told that I am saving
|
4 # This code is free software; you can redistribute it and/or modify it
5 # under the terms of the GNU General Public License version 2 only, as
6 # published by the Free Software Foundation. Oracle designates this
7 # particular file as subject to the "Classpath" exception as provided
8 # by Oracle in the LICENSE file that accompanied this code.
9 #
10 # This code is distributed in the hope that it will be useful, but WITHOUT
11 # ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 # FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 # version 2 for more details (a copy is included in the LICENSE file that
14 # accompanied this code).
15 #
16 # You should have received a copy of the GNU General Public License version
17 # 2 along with this work; if not, write to the Free Software Foundation,
18 # Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 #
20 # Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 # or visit www.oracle.com if you need additional information or have any
22 # questions.
23 #
24 # tzdb data for North and Central America and environs
25
26 # This file is in the public domain, so clarified as of
27 # 2009-05-17 by Arthur David Olson.
28
29 # also includes Central America and the Caribbean
30
31 # This file is by no means authoritative; if you think you know better,
32 # go ahead and edit the file (and please send any changes to
33 # tz@iana.org for general use in the future). For more, please see
34 # the file CONTRIBUTING in the tz distribution.
35
36 # From Paul Eggert (1999-03-22):
37 # A reliable and entertaining source about time zones is
38 # Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
39
40 ###############################################################################
41
42 # United States
43
44 # From Paul Eggert (1999-03-31):
45 # Howse writes (pp 121-125) that time zones were invented by
56 # work in the US was William Frederick Allen - railway engineer,
57 # managing editor of the Travelers' Guide, and secretary of the
58 # General Time Convention, a railway standardization group. Allen
59 # spent months in dialogs with scientific and railway leaders,
60 # developed a workable plan to institute time zones, and presented it
61 # to the General Time Convention on 1883-04-11, saying that his plan
62 # meant "local time would be practically abolished" - a plus for
63 # railway scheduling. By the next convention on 1883-10-11 nearly all
64 # railroads had agreed and it took effect on 1883-11-18. That Sunday
65 # was called the "day of two noons", as some locations observed noon
66 # twice. Allen witnessed the transition in New York City, writing:
67 #
68 # I heard the bells of St. Paul's strike on the old time. Four
69 # minutes later, obedient to the electrical signal from the Naval
70 # Observatory ... the time-ball made its rapid descent, the chimes
71 # of old Trinity rang twelve measured strokes, and local time was
72 # abandoned, probably forever.
73 #
74 # Most of the US soon followed suit. See:
75 # Bartky IR. The adoption of standard time. Technol Cult 1989 Jan;30(1):25-56.
76 # https://dx.doi.org/10.2307/3105430
77
78 # From Paul Eggert (2005-04-16):
79 # That 1883 transition occurred at 12:00 new time, not at 12:00 old time.
80 # See p 46 of David Prerau, Seize the daylight, Thunder's Mouth Press (2005).
81
82 # From Paul Eggert (2006-03-22):
83 # A good source for time zone historical data in the US is
84 # Thomas G. Shanks, The American Atlas (5th edition),
85 # San Diego: ACS Publications, Inc. (1991).
86 # Make sure you have the errata sheet; the book is somewhat useless without it.
87 # It is the source for most of the pre-1991 US entries below.
88
89 # From Paul Eggert (2001-03-06):
90 # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
91 # in his whimsical essay "An Economical Project for Diminishing the Cost
92 # of Light" published in the Journal de Paris (1784-04-26).
93 # Not everyone is happy with the results:
94 #
95 # I don't really care how time is reckoned so long as there is some
96 # agreement about it, but I object to being told that I am saving
|