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From: Tassilo Horn <tsdh@gnu.org>
Newsgroups: comp.lang.java.programmer
Subject: Re: Parsing calendar weeks to LocalDates with DateTimeFormatter
Date: Wed, 07 Sep 2016 10:11:59 +0200
Organization: University Koblenz-Landau Campus Koblenz
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Tassilo Horn <tsdh@gnu.org> writes:

>          // When parsing calendar weeks like "22.2016", we want to get
>          // the last work day in that week.  We assume that everyone
>          // in every locale has a 5 days work week (don't know how to do
>          // better).
>          return FORMATTER_KW.parse(editorText, temporal ->
>          {
>             WeekFields weekFields = WeekFields.of(Locale.getDefault());
>             DayOfWeek firstDayInWeek = weekFields.getFirstDayOfWeek();
>             DayOfWeek lastWorkDay = firstDayInWeek.minus(4);
>             long weekOfWeekBasedYear = temporal.getLong(weekFields.weekOfWeekBasedYear());
>             long year = temporal.getLong(weekFields.weekBasedYear());
>             LocalDate date = LocalDate.of(0, 1, 1);
>             date = date.plusYears(year);
>             date = date.plusWeeks(weekOfWeekBasedYear);
>             date = date.with(lastWorkDay);
>             return date;
>          });

Oh, obviously StartOfWeek - 4 days is not a sane assumption for last
workday, and neither would be StartOfWeek + 4.  So right now, I just use
DayOfWeek.FRIDAY.

Bye,
Tassilo