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C# code:
DateTime dt = DateTime.fromOADate(40277.4927000525);
MessageBox.Show(dt.ToString());
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C# code:
SqlDataAdapter da = new SqlDataAdapter("select [ID],cast([Time] as datetime) from DatapointValue2", con);
//×¢:40277.4927000525¾ÍÊÇTimeÁÐijһÐÐÖеÄÖµ
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