GregorianCalendar公里类

使用GregorianCalendar 获得日期是年中第几周第几天

public class Common
    {
        /// <summary>
        /// 获取日期是年中的第几周
        /// </summary>
        /// <param name="dtime"></param>
        /// <returns></returns>
        public static int GetWeekIndexOfYear(DateTime dtime)
        {
            GregorianCalendar gc = new GregorianCalendar();
            int weekOfYear = gc.GetWeekOfYear(dtime, CalendarWeekRule.FirstDay, DayOfWeek.Monday);
            return weekOfYear;
        }

        /// <summary>
        /// 获取日期是本周的第几天
        /// </summary>
        /// <param name="dtime"></param>
        /// <returns></returns>
        public static DayOfWeek GetDateIndexOfWeekAndMonth(DateTime dtime, out int indexOfMonth)
        {
            GregorianCalendar gc = new GregorianCalendar();
            indexOfMonth = gc.GetDayOfMonth(dtime);
            DayOfWeek dayOfWeek = gc.GetDayOfWeek(dtime);
            return dayOfWeek;
        }
    }