c# DateTime常用用法

 DateTime now = DateTime.Now;
            //当前时间
            Console.WriteLine(now);
            //年月日 - 时分秒(为0)
            Console.WriteLine(now.Date.ToString());
            //年月日 - 时分
            Console.WriteLine(now.ToString("yyyy-MM-dd hh:mm"));
            //年月日
            Console.WriteLine(now.ToString("yyyy-MM-dd"));
            //时分
            Console.WriteLine(now.ToString("HH:mm:ss"));
            //增加一天
            DateTime afterNow = now.AddDays(1);
            Console.WriteLine(afterNow);
            //减去一天
            DateTime beforeNow = now.AddDays(-1);
            Console.WriteLine(beforeNow);