DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:ffff"); // => 2016-05-09 13:09:55:2350

DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:ffff"); // => 2016/05/09 13:09:55:2350

DateTime.Now.ToString("yyyy/MM/dd HH:mm:ss:ffff dddd"); // => 2016/05/09 13:09:55:2350 星期一

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