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https://issues.apache.org/jira/browse/LANG-1637?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17257618#comment-17257618
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Michael Osipov commented on LANG-1637:
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OK, this was a misunderstanding. Sorry for that. Here is the problem: {{Y}}
denotes the ISO week year, not necessary the current year.
{{TwoDigitYearField.INSTANCE}} is passed to to {{WeekYear}} ctor. It calls the
former rule with {{calendar.getWeekYear()}}. The problem is that
{{TwoDigitYearField#appendTo(Appendable, int)}} expects a value between 0 and
99 because it uses {{##appendDigits()}} which operates on two-digit numbers
only. Everything else is undefined. Since it is an internal method it expects
the input to be always valid.
> FastDatePrinter formatting using YY pattern yields junk digits
> --------------------------------------------------------------
>
> Key: LANG-1637
> URL: https://issues.apache.org/jira/browse/LANG-1637
> Project: Commons Lang
> Issue Type: Bug
> Affects Versions: 3.11
> Reporter: Uri Gonen
> Priority: Minor
> Time Spent: 3h 10m
> Remaining Estimate: 0h
>
> {code:java}
> final GregorianCalendar cal = new GregorianCalendar(2020, 12, 31, 0, 0, 0);
> final DatePrinter printer2Digits = getInstance("YY");
> assertEquals("21", printer2Digits.format(cal));
> {code}
> the above test fails
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