把周数转化为日期

最新推荐文章于 2024-08-14 04:21:59 发布

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function convertWeekNumberToFirstDate(sYear, sWeek, startFromFirstMonday)
{
    if (startFromFirstMonday == undefined) startFromFirstMonday = true;

    var weekIndex = 1;

    var year = parseInt(sYear);
    var week = parseInt(sWeek);

    var i = 1;
    var dFirstDate = new Date(year, 0, i);

    if (!startFromFirstMonday)
    {
        if (weekIndex < week)
        {
            weekIndex++;
        }
        else
            return dFirstDate;
    }

    if (dFirstDate.getDay() != 1)
    {
        i += 7 - dFirstDate.getDay() + 1;
        dFirstDate.setFullYear(year, 0, i);
    }

    if (weekIndex < week)
    {
        i += 7*(week-weekIndex);
        dFirstDate.setFullYear(year, 0, i);
    }

    return dFirstDate;
}