获取给定当前日期和周开始的周开始和结束日期 [英] Get the week start and end date given a current date and week start

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问题描述

如果可能,我更喜欢以下场景的 joda 或非 joda 解决方案

If possible I would prefer a joda or non-joda solution for the scenario below

假设我的一周从 02/05/2012 开始并且给定的当前日期是 02/22/2011.我需要计算给定当前日期的周开始和结束日期.所以我的解决方案应该让一周从 02/19 开始,一周在 02/25 结束.为简单起见,我将我的一周开始时间设置为 02/05/2011,但它可能是任何一天,而且我的一周总是有 7 天.

Lets say if my week starts on 02/05/2012 and the given current date is 02/22/2011. I need to calculate the week start and end date for the given current date. So my solution should have the week start as 02/19 and week ends at 02/25. For simplicity, I have set my week start here as 02/05/2011 but it could be any day potentially and my week always has 7 days.

我现有的代码如下,但似乎没有按预期工作.

My existing code is below but doesnt seem to work as expected.

public Interval getWeekInterval(Date calendarStartDate, Date date)
{
    Calendar sDate = Calendar.getInstance();
    sDate.setTime(getMidnightDate(calendarStartDate));

    Calendar eDate = Calendar.getInstance();
    eDate.setTime(date);

    Calendar weekStartDate = (Calendar) sDate.clone();
    logger.debug("Date:" + sDate.getTime());
    while (sDate.before(eDate)) {
        weekStartDate = sDate;
        sDate.add(Calendar.DAY_OF_WEEK_IN_MONTH, 1);
    }

    return new Interval(weekStartDate.getTime(), sDate.getTime());
}

推荐答案

试试这个(伪代码):

// How many days gone after reference date (a known week-start date)
daysGone  = today - referenceDate;

// A new week starts after each 7 days
dayOfWeek = daysGone % 7;

// Now, we know today is which day of the week.
// We can find start & end days of this week with ease
weekStart = today - dayOfWeek;
weekEnd   = weekStart + 6;

现在,我们可以缩短所有这些到两行:

Now, we can shorten all of this to two lines:

weekStart = today - ((today - referenceDate) % 7);
weekEnd   = weekStart + 6;

请注意我们减去日期值(如整数)以显示算法.你必须正确地编写你的java代码.

Note that we subtracted date values like integers to show algorithm. You have to write your java code properly.

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