如何使用時刻迭代周數，周的開始/結束日期

我怎樣才能得到所有特定月份的week number？from/to date

下面的代碼是我構建的特定月份的 display week number，from/to date每當我在回圈中插入函式時，它都會回傳無限回圈。

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())
    );
})

結果應回傳串列week number，from/to date
示例網址： https ://savvytime.com/week-number/philippines/2022

這是我在回圈外運行函式時的示例：

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>

uj5u.com熱心網友回復：

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>

當您計算 12 月（第 12 個月）的周數時，您從上個月的最后一周（11 月，即 11 日）開始，并且在您的do {...} while回圈中，您將 7 天添加到weekStart. 到目前為止一切順利，但是您while (weekStart.getMonth() < month)正在檢查 的 0-11 值weekStart.getMonth()，當它從 11 向前滾動時，它不會轉到 12，而是轉到 0。所以它總是小于 12（12 月！）！

你可以通過調整你while來解決這個問題：

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

標籤：javascript 数组 日期 约会时间 异酸盐

上一篇：如何僅將日期列分為兩列

下一篇：按R中的日期差異分組