Why

• 最近自己写了个周报的生成小工具，需要知道当前的周数还有具体几月几号，以下是简单记录。

How

 /// <summary>
 /// 获取指定日期的 ISO 周数,以及该周的起止日期(周一到周日)
 /// </summary>
public static (int WeekNumber, DateTime Monday, DateTime Sunday) GetWeekInfo(DateTime date)
 {
     int weekNumber = ISOWeek.GetWeekOfYear(date);
     int year = ISOWeek.GetYear(date);
     DateTime monday = ISOWeek.ToDateTime(year, weekNumber, DayOfWeek.Monday);
     DateTime sunday = monday.AddDays(6);
     return (weekNumber, monday, sunday);
 }

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