代码如下:/// <summary> /// 计算本周起始日期(礼拜一的日期) /// </summary> /// <param name=”someDate”>该周中任意一天</param> /// <returns>返回礼拜一日期,后面的具体时、分、秒和传入值相等</returns> public static DateTime CalculateFirstDateOfWeek(DateTime someDate) { int i = someDate.DayOfWeek – DayOfWeek.Monday; if (i == -1) i = 6;// i值 > =