C# 日期和字符串相互转换

]DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss:fff"); // => 2016-05-09 13:09:55:235

]var dt = Convert.ToDateTime("2017-02-01 12:09:35");
//----------------------------------------------------------------------------------------
//Convert.ToDateTime(string)中的string可以是各种格式，
//都能正常转换，非常好用，例如
var dt1 = Convert.ToDateTime("2017-2-2 12:02:22");
var dt2 = Convert.ToDateTime("9:2 2017-2-02");
Console.WriteLine(dt1.ToString("yyyy-MM-dd HH:mm:ss"));
Console.WriteLine(dt2.ToString("yyyy-MM-dd HH:mm:ss"));
//结果是
//2017-02-02 12:02:22
//2017-02-02 09:02:00
//-----------------------------------------------------------------------------------------

]string dateString = "20110526131407";
DateTime dt = DateTime.ParseExact(dateString, "yyyyMMddHHmmss",
System.Globalization.CultureInfo..InvariantCulture);