27 # This file is by no means authoritative; if you think you know better, |
27 # This file is by no means authoritative; if you think you know better, |
28 # go ahead and edit the file (and please send any changes to |
28 # go ahead and edit the file (and please send any changes to |
29 # tz@iana.org for general use in the future). For more, please see |
29 # tz@iana.org for general use in the future). For more, please see |
30 # the file CONTRIBUTING in the tz distribution. |
30 # the file CONTRIBUTING in the tz distribution. |
31 |
31 |
32 # From Paul Eggert (2006-03-22): |
32 # From Paul Eggert (2014-10-31): |
33 # A good source for time zone historical data outside the U.S. is |
33 # |
|
34 # Unless otherwise specified, the source for data through 1990 is: |
34 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), |
35 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), |
35 # San Diego: ACS Publications, Inc. (2003). |
36 # San Diego: ACS Publications, Inc. (2003). |
36 # |
37 # Unfortunately this book contains many errors and cites no sources. |
37 # For data circa 1899, a common source is: |
|
38 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94. |
|
39 # http://www.jstor.org/stable/1774359 |
|
40 # |
38 # |
41 # Gwillim Law writes that a good source |
39 # Gwillim Law writes that a good source |
42 # for recent time zone data is the International Air Transport |
40 # for recent time zone data is the International Air Transport |
43 # Association's Standard Schedules Information Manual (IATA SSIM), |
41 # Association's Standard Schedules Information Manual (IATA SSIM), |
44 # published semiannually. Law sent in several helpful summaries |
42 # published semiannually. Law sent in several helpful summaries |
45 # of the IATA's data after 1990. |
43 # of the IATA's data after 1990. Except where otherwise noted, |
46 # |
44 # IATA SSIM is the source for entries after 1990. |
47 # Except where otherwise noted, Shanks & Pottenger is the source for |
45 # |
48 # entries through 1990, and IATA SSIM is the source for entries afterwards. |
46 # For data circa 1899, a common source is: |
|
47 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94. |
|
48 # http://www.jstor.org/stable/1774359 |
49 # |
49 # |
50 # Earlier editions of these tables used the North American style (e.g. ARST and |
50 # Earlier editions of these tables used the North American style (e.g. ARST and |
51 # ARDT for Argentine Standard and Daylight Time), but the following quote |
51 # ARDT for Argentine Standard and Daylight Time), but the following quote |
52 # suggests that it's better to use European style (e.g. ART and ARST). |
52 # suggests that it's better to use European style (e.g. ART and ARST). |
53 # I suggest the use of _Summer time_ instead of the more cumbersome |
53 # I suggest the use of _Summer time_ instead of the more cumbersome |