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Posted to issues@commons.apache.org by "Benedikt Ritter (JIRA)" <ji...@apache.org> on 2014/07/20 12:46:39 UTC
[jira] [Commented] (LANG-1029) FastDateFormat static instance
format differently compared to new instance when changing timezone
[ https://issues.apache.org/jira/browse/LANG-1029?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14067879#comment-14067879 ]
Benedikt Ritter commented on LANG-1029:
---------------------------------------
Why don't you provide your test as a junit test? ;-)
> FastDateFormat static instance format differently compared to new instance when changing timezone
> -------------------------------------------------------------------------------------------------
>
> Key: LANG-1029
> URL: https://issues.apache.org/jira/browse/LANG-1029
> Project: Commons Lang
> Issue Type: Bug
> Components: lang.time.*
> Affects Versions: 3.3.2
> Reporter: Sven Diedrichsen
> Fix For: Patch Needed
>
>
> Static FastDateFormat instances don't recognize default TimeZone changes and thus don't behave equal to newly created instances of FastDateFormat or SimpleDateFormat.
> I can imagine people using FastDateFormat like this for performance optimization reasons.
> {code:title=Test for difference}
> private static final String DATE_TIME_PATTERN = "dd.MM.yyyy HH:mm:ss";
> private static final FastDateFormat FDF = FastDateFormat.getInstance(DATE_TIME_PATTERN);
> public static void main(String[] args) {
> TimeZone gmtTimeZone = TimeZone.getTimeZone("GMT");
> Calendar date = Calendar.getInstance();
> date.setTimeZone(gmtTimeZone);
> date.set(2014, Calendar.JANUARY, 1, 0, 0 ,0);
> TimeZone backupTimeZone = TimeZone.getDefault();
> TimeZone.setDefault(gmtTimeZone);
> System.out.println("FastDateFormat static:\t\t"+ FDF.format(date.getTime()));
> System.out.println("FastDateFormat instance:\t" + FastDateFormat.getInstance(DATE_TIME_PATTERN).format(date.getTime()));
> System.out.println("SimpleDateFormat instance:\t" + new SimpleDateFormat(DATE_TIME_PATTERN).format(date.getTime()));
> TimeZone.setDefault(backupTimeZone);
> }
> {code}
> {panel:title=Output}
> FastDateFormat static: 01.01.2014 01:00:00
> FastDateFormat instance: 01.01.2014 00:00:00
> SimpleDateFormat instance: 01.01.2014 00:00:00
> {panel}
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