| ********************************************************************** |
| * Copyright (c) 2003, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| ********************************************************************** |
| * Author: Alan Liu |
| * Created: August 18 2003 |
| * Since: ICU 2.8 |
| ********************************************************************** |
| |
| ---------------------------------------------------------------------- |
| OVERVIEW |
| |
| This file describes the tools in icu/source/tools/gentz/tzcode |
| |
| The purpose of these tools is to process the zoneinfo or "Olson" time |
| zone database into a form usable by ICU4C (release 2.8 and later). |
| Unlike earlier releases, ICU4C 2.8 supports historical time zone |
| behavior, as well as the full set of Olson compatibility IDs. |
| |
| References: |
| |
| ICU4C: http://oss.software.ibm.com/icu/ |
| Olson: ftp://elsie.nci.nih.gov/pub/ |
| |
| ---------------------------------------------------------------------- |
| ICU4C vs. ICU4J |
| |
| As of release 2.8, the ICU time zone implementations in C and Java |
| have diverged for various reasons. The C implementation is a full |
| implementation, whereas ICU4J (as of 2.8) uses the underlying JDK |
| 1.3 or 1.4 time zone implementation. |
| |
| The "present day snapshot" only reflects current time zone behavior, |
| without historical variation. Furthermore, it lacks the full set of |
| Olson compatibility IDs. The "present day snapshot" is implemented in |
| ICU (C and Java) <= 2.6. |
| |
| ---------------------------------------------------------------------- |
| BACKGROUND |
| |
| The zoneinfo or "Olson" time zone package is used by various systems |
| to describe the behavior of time zones. The package consists of |
| several parts. E.g.: |
| |
| Index of ftp://elsie.nci.nih.gov/pub/ |
| |
| classictzcode.tar.gz 65 KB 12/10/1994 12:00:00 AM |
| classictzdata.tar.gz 67 KB 12/10/1994 12:00:00 AM |
| e5+57.tar.gz 2909 KB 3/22/1993 12:00:00 AM |
| iso8601.ps.gz 16 KB 7/27/1996 12:00:00 AM |
| leastsq.xls 49 KB 4/24/1997 12:00:00 AM |
| ltroff.tar.gz 36 KB 7/16/1993 12:00:00 AM |
| pi.shar.gz 4 KB 3/9/1994 12:00:00 AM |
| tzarchive.gz 3412 KB 8/18/2003 4:00:00 AM |
| tzcode2003a.tar.gz 98 KB 3/24/2003 2:32:00 PM |
| tzdata2003a.tar.gz 132 KB 3/24/2003 2:32:00 PM |
| |
| ICU only uses the tzcodeYYYYV.tar.gz and tzdataYYYYV.tar.gz files, |
| where YYYY is the year and V is the version letter ('a'...'z'). |
| |
| ---------------------------------------------------------------------- |
| HOWTO |
| |
| 1. Obtain the current versions of tzcodeYYYYV.tar.gz (aka `tzcode') |
| and tzdataYYYYV.tar.gz (aka `tzdata') from the FTP site given |
| above. Either manually download or use wget: |
| |
| $ cd {path_to}/icu/source/tools/gentz/tzcode |
| $ wget "ftp://elsie.nci.nih.gov/pub/tz*.tar.gz" |
| |
| 2. Unpack tzcode and tzdata directly into the directory gentz/tzcode: |
| |
| $ tar xzvf tzcode*.tar.gz |
| $ tar xzvf tzdata*.tar.gz |
| |
| 3. Apply the ICU patch to zic.c: |
| |
| $ patch < patch-icu-tzcode |
| |
| If patch complains at this point, there is a mismatch that must be |
| manually addressed. See the CVS log of `patch-icu-tzcode' for |
| version details. |
| |
| 4. Build: |
| |
| $ make icu_data |
| |
| 5. Copy the data file to the correct location in the ICU source tree: |
| |
| $ cp zoneinfo.txt ../../../data/misc/ |
| |
| 6. Rebuild ICU: |
| |
| $ cd ../../../ |
| $ {*make} |
| |
| 7. Don't forget to check in the new zoneinfo.txt (from its location at |
| {path_to}/icu/source/data/misc/zoneinfo.txt) into CVS. |
| |
| ---------------------------------------------------------------------- |
| eof |