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ICU-9867 Added a note about pattern V semantics change in readme.html

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Yoshito Umaoka 2013-02-11 20:12:34 +00:00
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@ -238,7 +238,30 @@
<p>For details see the email "ICU4C C++ BasicTimeZone subclassing-API breaking changes"
sent on 2013-Feb-5 to the icu-support
<a href="http://site.icu-project.org/contacts">mailing lists</a>,
and <a href="http://bugs.icu-project.org/trac/ticket/9648">ICU ticket #9648</a>.
and <a href="http://bugs.icu-project.org/trac/ticket/9648">ICU ticket #9648</a>.</p>
<h3>Date format pattern "V"</h3>
<p>The date format pattern "V" was introduced in ICU 3.8 (inherited from CLDR 1.5) as
a variation of pattern "z" to support time zone abbreviation format such as "PST".
The pattern "z" use a time zone abbreviation only when it is commonly used for a locale.
The pattern "V" was slightly different from pattern "z" and the pattern designates
a time zone abbreviation even it is not commonly used for a locale. For example, time
zone abbreviation "AEST" for Australian Eastern Standard Time might not be well recognized
by people in the United States. For the zone, pattern "z" does not use "AEST" (instead, use
UTC offset format "GMT+10:00, as the fallback) , while pattern "V" used to print out "AEST".
In CLDR 21, the data used for checking commonly used or not was completely removed (CLDR
ticket <a href="http://unicode.org/cldr/trac/ticket/4052">#4052</a>), so the difference
between pattern "z" and "V" is no longer available since ICU 49 (based on CLDR 21 specification).</p>
<p>In CLDR 23, the CLDR technical committee decided to reuse the semantically deprecated
pattern "V" for a different purpose. With the new specification, the date format pattern
"V" is used for short time zone IDs, such as "uslax" for zone America/Los_Angeles. ICU 51
implements the new specification. So existing ICU users currently using custom date format
patterns with pattern "V" are suggested to change them to pattern "z".</p>
<p>Note that the existing pattern "VVVV" for a time zone's generic location name is not
affected by the new specification and the pattern "VVVV" continues to work as same as
previous ICU releases.</p>
<h2><a name="Download" href="#Download" id="Download">How To Download the
Source Code</a></h2>