C#计算两个日期之间相差的天数

 

说明：如：1900-01-01与1900-01-01之间算一天

 

 private static int DateDiff(DateTime dateStart, DateTime dateEnd)
        {
            DateTime start = Convert.ToDateTime(dateStart.ToShortDateString());
            DateTime end = Convert.ToDateTime(dateStart.ToShortDateString());

            TimeSpan sp = end.Subtract(start);

            return sp.Days;
        }