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  • 计算某一年 某一周 的起始时间和结束时间【待修改20180717】

    /// <summary>
    /// 计算某一年 某一周 的起始时间和结束时间
    /// </summary>
    /// <param name="year"></param>
    /// <param name="week"></param>
    /// <param name="first"></param>
    /// <param name="last"></param>
    /// <returns></returns>
    public static bool CalcWeekDay(int year, int week, out DateTime first, out DateTime last)
    {
    first = DateTime.MinValue;
    last = DateTime.MinValue;
    //年份超限
    if (year < 1700 || year > 9999) return false;
    //周数错误
    if (week < 1 || week > 53) return false;
    //指定年范围
    DateTime start = new DateTime(year, 1, 1);
    DateTime end = new DateTime(year, 12, 31);
    int startWeekDay = (int)start.DayOfWeek;

    if (week == 1)
    {
    first = start;
    last = start.AddDays(6 - startWeekDay);
    }
    else
    {
    //周的起始日期
    first = start.AddDays((7 - startWeekDay) + (week - 2) * 7);
    last = first.AddDays(6);
    if (last > end)
    {
    last = end;
    }
    }
    return (first <= end);
    }

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  • 原文地址:https://www.cnblogs.com/guzhengtao/p/20180706_1523.html
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