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-> DateTime
string formatStr="2000-01-01 00:00:00";
1, Convert.ToDateTime(formatStr);
2, DateTime.Parse(formatStr);
3, new System.DateTime(2000, 1, 1, 0, 0, 0);
DateTime -> string
DateTime dt=DateTime.Now;
1, dt.ToString("yy-MM-dd hh:mm:ss")
dt.ToString();
dt.ToFileTime().ToString();//127756416859912816
dt.ToLongDateString().ToString();//2005年11月5
dt.ToLongTimeString().ToString();//13:21:25
2, string.Format("{0:formatstr}",dt)
formatstr:
d ShortDatePattern
D LongDatePattern
.....
"yy-MM-dd hh:mm:ss"
3, dt.GetDateTimeFormats(formatstr)[0].ToString();
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