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readme.txt

      1 **********************************************************************
      2 * Copyright (c) 2003-2014, International Business Machines
      3 * Corporation and others.  All Rights Reserved.
      4 **********************************************************************
      5 * Author: Alan Liu
      6 * Created: August 18 2003
      7 * Since: ICU 2.8
      8 **********************************************************************
      9 
     10 Note:  this directory currently contains tzcode as of tzcode2014b.tar.gz
     11    with localtime.c  patches from tzcode2014b.tar.gz
     12 
     13 
     14 ----------------------------------------------------------------------
     15 OVERVIEW
     16 
     17 This file describes the tools in icu/source/tools/tzcode
     18 
     19 The purpose of these tools is to process the zoneinfo or "Olson" time
     20 zone database into a form usable by ICU4C (release 2.8 and later).
     21 Unlike earlier releases, ICU4C 2.8 supports historical time zone
     22 behavior, as well as the full set of Olson compatibility IDs.
     23 
     24 References:
     25 
     26 ICU4C:  http://www.icu-project.org/
     27 Olson:  ftp://ftp.iana.org/tz/releases/
     28 
     29 ----------------------------------------------------------------------
     30 ICU4C vs. ICU4J
     31 
     32 For ICU releases >= 2.8, both ICU4C and ICU4J implement full
     33 historical time zones, based on Olson data.  The implementations in C
     34 and Java are somewhat different.  The C implementation is a
     35 self-contained implementation, whereas ICU4J uses the underlying JDK
     36 1.3 or 1.4 time zone implementation.
     37 
     38 Older versions of ICU (C and Java <= 2.6) implement a "present day
     39 snapshot".  This only reflects current time zone behavior, without
     40 historical variation.  Furthermore, it lacks the full set of Olson
     41 compatibility IDs.
     42 
     43 ----------------------------------------------------------------------
     44 BACKGROUND
     45 
     46 The zoneinfo or "Olson" time zone package is used by various systems
     47 to describe the behavior of time zones.  The package consists of
     48 several parts.  E.g.:
     49 
     50   Index of ftp://ftp.iana.org/tz/releases/
     51 
     52   tzcode2014b.tar.gz      172 KB       3/25/2014     05:11:00 AM
     53   tzdata2014b.tar.gz      216 KB       3/25/2014     05:11:00 AM
     54 
     55 ICU only uses the tzdataYYYYV.tar.gz files,
     56 where YYYY is the year and V is the version letter ('a'...'z').
     57 
     58 This directory has partial contents of tzcode checked into ICU
     59 
     60 ----------------------------------------------------------------------
     61 HOWTO
     62 
     63 0. Note, these instructions will only work on POSIX type systems.
     64 
     65 1. Obtain the current versions of tzdataYYYYV.tar.gz (aka `tzdata') from
     66    the FTP site given above.  Either manually download or use wget:
     67 
     68    $ cd {path_to}/icu/source/tools/tzcode
     69    $ wget "ftp://ftp.iana.org/tz/releases/tzdata*.tar.gz"
     70 
     71 2. Copy only one tzdata*.tar.gz file into the icu/source/tools/tzcode/
     72    directory (this directory).
     73 
     74    *** Make sure you only have ONE FILE named tzdata*.tar.gz in the
     75        directory.
     76 
     77 3. Build ICU normally. You will see a notice "updating zoneinfo.txt..."
     78 
     79 ### Following instructions for ICU maintainers only ###
     80 
     81 4. Obtain the current version of tzcodeYYYY.tar.gz from the FTP site to
     82    this directory.
     83 
     84 5. Run make target "check-dump".  This target extract makes the original
     85    tzcode and compile the original tzdata with icu supplemental data
     86    (icuzones).  Then it makes zdump / icuzdump and dump all time
     87    transitions for all ICU timezone to files under zdumpout / icuzdumpout
     88    directory.  When they produce different results, the target returns
     89    the error.
     90 
     91 6. Don't forget to check in the new zoneinfo64.txt (from its location at
     92    {path_to}/icu/source/data/misc/zoneinfo64.txt) into SVN.
     93 
     94