| ********************************************************************** |
| * Copyright (c) 2003-2007, International Business Machines |
| * Corporation and others. All Rights Reserved. |
| ********************************************************************** |
| * Author: Alan Liu |
| * Created: August 18 2003 |
| * Since: ICU 2.8 |
| ********************************************************************** |
| |
| Note: this directory currently contains tzcode as of tzcode2006h.tar.gz |
| with localtime.c patches from tzcode2006i.tar.gz |
| |
| |
| ---------------------------------------------------------------------- |
| OVERVIEW |
| |
| This file describes the tools in icu/source/tools/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://www.icu-project.org/ |
| Olson: ftp://elsie.nci.nih.gov/pub/ |
| |
| ---------------------------------------------------------------------- |
| ICU4C vs. ICU4J |
| |
| For ICU releases >= 2.8, both ICU4C and ICU4J implement full |
| historical time zones, based on Olson data. The implementations in C |
| and Java are somewhat different. The C implementation is a |
| self-contained implementation, whereas ICU4J uses the underlying JDK |
| 1.3 or 1.4 time zone implementation. |
| |
| Older versions of ICU (C and Java <= 2.6) implement a "present day |
| snapshot". This only reflects current time zone behavior, without |
| historical variation. Furthermore, it lacks the full set of Olson |
| compatibility IDs. |
| |
| ---------------------------------------------------------------------- |
| 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 tzdataYYYYV.tar.gz files, |
| where YYYY is the year and V is the version letter ('a'...'z'). |
| |
| This directory has partial contents of tzcode checked into ICU |
| |
| ---------------------------------------------------------------------- |
| HOWTO |
| |
| 0. Note, these instructions will only work on POSIX type systems. |
| |
| 1. Obtain the current versions of tzdataYYYYV.tar.gz (aka `tzdata') from |
| the FTP site given above. Either manually download or use wget: |
| |
| $ cd {path_to}/icu/source/tools/tzcode |
| $ wget "ftp://elsie.nci.nih.gov/pub/tzdata*.tar.gz" |
| |
| 2. Copy only one tzdata*.tar.gz file into the icu/source/tools/tzcode/ |
| directory (this directory). |
| |
| *** Make sure you only have ONE FILE named tzdata*.tar.gz in the |
| directory. |
| |
| 3. Build ICU normally. You will see a notice "updating zoneinfo.txt..." |
| |
| ### Following instructions for ICU maintainers only ### |
| |
| 4. Obtain the current version of tzcodeYYYY.tar.gz from the FTP site to |
| this directory. |
| |
| 5. Run make target "check-dump". This target extract makes the original |
| tzcode and compile the original tzdata with icu supplemental data |
| (icuzones). Then it makes zdump / icuzdump and dump all time |
| transitions for all ICU timezone to files under zdumpout / icuzdumpout |
| directory. When they produce different results, the target returns |
| the error. |
| |
| 6. Don't forget to check in the new zoneinfo.txt (from its location at |
| {path_to}/icu/source/data/misc/zoneinfo.txt) into SVN. |
| |