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string dtStr = dt.ToString();
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dt.ToString("yyyyÄêMMÔÂddÈÕ"); //2005Äê11ÔÂ5ÈÕ
dt.ToString("yyyy-MM-dd"); //2005-11-5
string.Format("{0:d}",dt); //2005-11-5
string.Format("{0:D}",dt); //2005Äê11ÔÂ5ÈÕ
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string dtString = “2009-10-12 00:12:05”;
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DateTime dt2 = Convert.ToDateTime(dtStr); //·½Ê½¶þ
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dt.ToFileTimeUtc(); //127756704859912816
dt.ToLocalTime(); //2005-11-5 21:21:25
dt.ToLongDateString(); //2005Äê11ÔÂ5ÈÕ
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dt.Year //2005
dt.Date
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