从Java FX中获取给定日期的周数 [英] Get the weeknumber from a given date in Java FX

问题描述

我有一个javafx.scene.control.DatePicker。我想从所选日期中提取（区域设置）周数。到目前为止，我还没有找到解决方案，我不想编写自己的算法。我使用Java8并希望它可以在新的Java时间库中使用。

I have a javafx.scene.control.DatePicker. I want to extract the (Locale) week number from the selected date. Until now i haven't found a solution and i prefer not to write my own algorithm. I use Java8 and hope it is possible in the new java time library.

推荐答案

Java-8解决方案可以考虑在内使用的值来定义一周的本地定义日期选择器：

The Java-8-solution can take into account the local definition of a week using the value of a date-picker:

LocalDate date = datePicker.getValue(); // input from your date picker
Locale locale = Locale.US;
int weekOfYear = date.get(WeekFields.of(locale).weekOfWeekBasedYear());

还要记住，流行的替代Joda-Time不支持这样一个本地化的周 - 年字段。例如：在ISO-8601（广泛使用）中，本周从周一开始，在美国周日开始。此外，在给定日历年中第一周开始的项目取决于区域设置。

Also keep in mind that the popular alternative Joda-Time does not support such a localized week-of-year fields. For example: In ISO-8601 (widely used) the week starts with Monday, in US with Sunday. Also the item when the first week of year starts in a given calendar year is dependent on the locale.

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