如何使用时刻迭代周数，start/end 周日期

Question

如何获取特定月份的所有 week number、from/to date？

下面的代码是我构造来显示特定月份的 week number、from/to date 每当我在循环中插入函数时，它 return 就是无限循环。

function getISOWeeksInMonth(month, year) {
    let weekStart = new Date(year, month - 1, 1);

    weekStart.setDate(weekStart.getDate() - (weekStart.getDay() || 7) + 1);

    let weekEnd = new Date(weekStart);
    weekEnd.setDate(weekEnd.getDate() + 6);

    let weekNum = moment(weekStart, "YYYY-MM-DD").week()

    let weeks = [];

    do {
        weeks.push({
            weekNum : weekNum++,
            start: new Date(weekStart),
            end: new Date(weekEnd)
        });

        weekStart.setDate(weekStart.getDate() + 7);
        weekEnd.setDate(weekEnd.getDate() + 7);
    } while (weekStart.getMonth() < month);

    return weeks;
}

_.forEach(moment.months(), function (month_name) {
    var month_number = moment().month(month_name).format("MM");

    getISOWeeksInMonth(month_number, 2022).forEach(week => console.log(
       'Week : ' + week.weekNum +
       '\nStart: ' + week.start.toDateString() + 
       '\nEnd  : ' + week.end.toDateString())
    );
})

结果应该return列表week number,from/to date
示例 Url： https://savvytime.com/week-number/philippines/2022

这是我运行函数外循环时的示例：

function getISOWeeksInMonth(month, year) {
    let weekStart = new Date(year, month - 1, 1);

    weekStart.setDate(weekStart.getDate() - (weekStart.getDay() || 7) + 1);

    let weekEnd = new Date(weekStart);
    weekEnd.setDate(weekEnd.getDate() + 6);


    let weekNum = moment(weekStart, "YYYY-MM-DD").week()

    let weeks = [];

    do {
        weeks.push({
            weekNum : weekNum++,
            start: new Date(weekStart),
            end: new Date(weekEnd)
        });

        weekStart.setDate(weekStart.getDate() + 7);
        weekEnd.setDate(weekEnd.getDate() + 7);
    } while (weekStart.getMonth() < month);

    return weeks;
}

getISOWeeksInMonth(1, 2022).forEach(week => console.log(
   'Week : ' + week.weekNum +
   '\nStart: ' + week.start.toDateString() + 
   '\nEnd  : ' + week.end.toDateString())
);

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.2/moment.min.js"></script>

Answer 1

function getISOWeeksInMonth(month, year) {
    let weekStart = new Date(year, month - 1, 1);

    weekStart.setDate(weekStart.getDate() - (weekStart.getDay() || 7) + 1);

    let weekEnd = new Date(weekStart);
    weekEnd.setDate(weekEnd.getDate() + 6);

    let weeks = [];

    do {
        let weekNum = moment(weekStart, "YYYY-MM-DD").week()

        weeks.push({
            weekNum : weekNum,
            start: new Date(weekStart),
            end: new Date(weekEnd)
        });

        weekStart.setDate(weekStart.getDate() + 7);
        weekEnd.setDate(weekEnd.getDate() + 7);
    } while (weekStart.getMonth() < month && (weekStart.getMonth() || (month < 12) ));

    return weeks;
}

let _ = moment.months()
_.forEach(function (month_name) {
    var month_number = moment().month(month_name).format("MM");

    getISOWeeksInMonth(month_number, 2022).forEach(week => console.log(
       'Week : ' + week.weekNum +
       '\nStart: ' + week.start.toDateString() + 
       '\nEnd  : ' + week.end.toDateString())
    );
})

<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.29.2/moment.min.js"></script>

当您计算 12 月（第 12 个月）的周数时，您从前一个月（11 月，即 11 日）的最后一周开始，并且在 do {...} while 循环中，您要添加7 天到 weekStart。到目前为止一切顺利，但是您的 while (weekStart.getMonth() < month) 正在检查 weekStart.getMonth() 的 0-11 值，当它从 11 向前滚动时，它不会转到 12，而是转到 0。所以它总是小于12（十二月！）！

您可以通过将 while 调整为：

来解决此问题

while (weekStart.getMonth() < month && (weekStart.getMonth() || (month < 12) ))

如何使用时刻迭代周数，start/end 周日期

How to iterate week number, start/end date of weeks using moment

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isodate