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https://issues.apache.org/jira/browse/LANG-909?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13881365#comment-13881365
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Dmitry Katsubo commented on LANG-909:
-------------------------------------

[~britter]: As you can read from {{FastDateParser}} JavaDoc, it supports into 
Gregorian calendars. For other calendars it creates {{SimpleDateFormat}}. In 
such "unpopular" scenarios {{ThreadSafeSimpleDateFormat}} is still beneficial. 
However added value is not big, so maybe one can copy code to his project 
directly from this issue after googling a while.

> Thread-safe wrapper for SimpleDateFormat
> ----------------------------------------
>
>                 Key: LANG-909
>                 URL: https://issues.apache.org/jira/browse/LANG-909
>             Project: Commons Lang
>          Issue Type: New Feature
>          Components: lang.time.*
>    Affects Versions: 3.1
>            Reporter: Dmitry Katsubo
>            Priority: Minor
>             Fix For: Review Patch
>
>         Attachments: DateFormatAdapter.java, ThreadSafeSimpleDateFormat.java, 
> ThreadSafeSimpleDateFormatTest.java
>
>
> {{SimpleDateFormat}} implementation in JDK is known to be [not 
> thread-safe|http://stackoverflow.com/questions/6840803/simpledateformat-thread-safety].
>  The attached helper class solves the problem by holding a separate instance 
> of {{SimpleDateFormat}} per thread.



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