C# 求两个时间的差值

商品保质期

//dateStart：系统时间； dateEnd ：物品到期日期
DateTime dateStart = DateTime.Now.Date;//2021/7/8
DateTime dateEnd = Convert.ToDateTime("2021-07-15");
DateTime start = Convert.ToDateTime(dateStart.ToShortDateString());
DateTime end = Convert.ToDateTime(dateEnd.ToShortDateString());
//求差值
TimeSpan sp = end.Subtract(start);

Console.WriteLine($"相差：{sp.Days}天");