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Retrieve the first day of week in current locale（今日は何曜日？）

Java

Last updated at 2020-03-02Posted at 2020-03-02

Some places(country) start the week with Sunday, some with Monday, maybe some with others, IDK,
some this magic let java library find the right one for us.
現地の週の始まりの曜日を計算する（月曜だったり日曜だったり、他もあり)

DayOfWeek firstDayOfWeek = WeekFields.of(locale).getFirstDayOfWeek();
LocalDate firstDay = today.with(TemporalAdjusters.previousOrSame(firstDayOfWeek));

*only serve as memo so actual syntax may break

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