获取当周第一天是星期日的那一年中的星期数(get number of the week in the year where first day of the week is Sunday)

获取当周第一天是星期日的那一年中的星期数(get number of the week in the year where first day of the week is Sunday)

我试图得到某个日期的星期数，在我的国家，星期一从星期天开始，所以6/5/2016的星期数是23，但它返回22，因为JAVA中的ISO星期从星期一开始，我已经使用了以下方法，但它不起作用

mCalendar = Calendar.getInstance(); int weekNum = mCalendar.get(Calendar.WEEK_OF_YEAR); //returns 22 I need 23 // I have tried the following method but it has no effect mCalendar.setFirstDayOfWeek(Calendar.SUNDAY);

请注意，我不能使用Time Class，我只能使用Java 7

I'm trying to get the number of the week for a date , In my country the week begins on Sunday so the week number of 6/5/2016 is 23 but it returning 22 because the ISO week in JAVA starts from Monday , I have used the following methods but it's not working

mCalendar = Calendar.getInstance(); int weekNum = mCalendar.get(Calendar.WEEK_OF_YEAR); //returns 22 I need 23 // I have tried the following method but it has no effect mCalendar.setFirstDayOfWeek(Calendar.SUNDAY);

note that I can't use the Time Class I can only use Java 7

最满意答案

我不知道你在哪里，但Java有一个很棒的日历，它允许以下内容：

Calendar calendar = Calendar.getInstance(Locale.TRADITIONAL_CHINESE); int weekNumber = calendar.get(Calendar.WEEK_OF_YEAR); System.out.println("Number of week: " + weekNumber); // produces 24 Calendar calendar = Calendar.getInstance(Locale.UK); int weekNumber = calendar.get(Calendar.WEEK_OF_YEAR); System.out.println("Number of week: " + weekNumber); // produces 22

你可以使用locale常量来指定你的位置，我想你会得到正确的周数。

编辑：现在我看到你的代码失败。 请注意，Java从顶部到您的代码的按钮：

Calendar calendar = Calendar.getInstance(); // First set the first day of the week ... calendar.setFirstDayOfWeek(Calendar.SUNDAY); // ... and than you could ask the calendar for the week int weekNumber = calendar.get(Calendar.WEEK_OF_YEAR); // will produce 23 System.out.println("Number of week: " + weekNumber);

I've just figured out how to change it you need to set up two things 1-first day of the week 2-the minimal day of week

setFirstDayOfWeek(Calendar.SUNDAY); setMinimalDaysInFirstWeek(7);

this will tell the calendar to make the fist day is sunday and with 7 days minimal week