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From "Pascal Schumacher (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (LANG-1029) FastDateFormat static instance format differently compared to new instance when changing timezone
Date Wed, 19 Oct 2016 15:24:59 GMT

     [ https://issues.apache.org/jira/browse/LANG-1029?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Pascal Schumacher closed LANG-1029.
-----------------------------------

> 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
>            Assignee: Charles Honton
>
> 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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