时间日期格式化

DateTime.Now.ToLocalTime().ToString();                // 2009-9-5 20:12:12

//获取日期
DateTime.Now.ToLongDateString().ToString();     // 2009年9月5日
DateTime.Now.ToShortDateString().ToString();        // 2009-9-5
DateTime.Now.ToString("yyyy-MM-dd");                 // 2009-09-05    　
DateTime.Now.Date.ToString();                            　// 2009-9-5 0:00:00
DateTime.ToFileTime().ToString();                    　// 128650040212500000
DateTime.Now.ToFileTimeUtc().ToString();         // 128650040772968750
DateTime.Now.ToOADate().ToString();                　// 39695.8461709606
DateTime.Now.ToUniversalTime().ToString();

//获取时间
DateTime.Now.ToLongTimeString().ToString();        // 20:16:16
DateTime.Now.ToShortTimeString().ToString();        // 20:16    　
DateTime.Now.ToString("hh:mm:ss");                 // 09:05:57    　
DateTime.Now.TimeOfDay.ToString();                    // 20:33:50.7197500

//其他
DateTime.ToFileTime().ToString();                    // 128650040212500000
DateTime.Now.ToFileTimeUtc().ToString();        // 128650040772968750
DateTime.Now.ToOADate().ToString();                　// 39695.8461709606
DateTime.Now.ToUniversalTime().ToString();        // 2009-5-912:19:14

DateTime.Now.Year.ToString();                     //获取年份2009    　
DateTime.Now.Month.ToString();                 //获取月份    5    　
DateTime.Now.DayOfWeek.ToString();            //获取星期Thursday
DateTime.Now.DayOfYear.ToString();            //获取第几天248    　
DateTime.Now.Hour.ToString();                     //获取小时20    
DateTime.Now.Minute.ToString();                 //获取分钟31    　
DateTime.Now.Second.ToString();                //获取秒数45

//n为一个数,可以数整数,也可以是小数

dt.AddYears(n).ToString();        //时间加n年    　
dt.AddDays(n).ToString();        //加n天    　
dt.AddHours(n).ToString();        //加n小时    　
dt.AddMonths(n).ToString();        //加n个月    　
dt.AddSeconds(n).ToString();        //加n秒    　
dt.AddMinutes(n).ToString();        //加n分

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