Unable to convert MySQL date/time value to System.DateTime

问题

I get this error:

Unable to convert MySQL date/time value to System.DateTime

while I am trying to fetch the data from a MySQL database. I have the date datatype in my MySQL database. But while retrieving it into my datatable, it get the error above.

How can I fix this?

回答1:

If I google for "Unable to convert MySQL date/time value to System.DateTime" I see numerous references to a problem accessing MySQL from Visual Studio. Is that your context?

One solution suggested is:

This is not a bug but expected behavior. Please check manual under connect options and set "Allow Zero Datetime" to true, as on attached pictures, and the error will go away.

Reference: http://bugs.mysql.com/bug.php?id=26054

回答2:

You must add Convert Zero Datetime=True to your connection string, for example:

server=localhost;User Id=root;password=mautauaja;Persist Security Info=True;database=test;Convert Zero Datetime=True

回答3:

i added both Convert Zero Datetime=True & Allow Zero Datetime=True and it works fine

回答4:

Pull the datetime value down as a string and do a DateTime.ParseExact(value, "ddd MMM dd hh:mm:ss yyyy", culture, styles); You would just need to set the date format up for the date you are returning from the database. Most likely it's yyyy-MM-dd HH:mm:ss. At least is is for me.

Check here more info on the DateTime.ParseExact

回答5:

Let MySql convert your unix timestamp to string. Use the mysql function FROM_UNIXTIME( 113283901 )

回答6:

I also faced the same problem, and get the columns name and its types. Then cast(col_Name as Char) from table name. From this way i get the problem as '0000-00-00 00:00:00' then I Update as valid date and time the error gets away for my case.

回答7:

You can make the application fully compatible with the date and time that is used by MySql. When the application runs at runtime provide this code. First Go to the Application Events. In the list of tools

1. Go to the project
2. Project Properties
3. Select the Application tab
4. View Application Events

This will open a new file. This file contains code used at the start of the application.

Write this code in that new file:

 Partial Friend Class MyApplication

    Private Sub MyApplication_Startup(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.StartupEventArgs) Handles Me.Startup
        My.Application.ChangeCulture("en")
        My.Application.ChangeUICulture("en")
        My.Application.Culture.DateTimeFormat.ShortDatePattern = "yyyy-MM-dd"
        My.Application.Culture.DateTimeFormat.LongDatePattern = "yyyy-MM-dd"
        My.Application.Culture.DateTimeFormat.LongTimePattern = "HH:mm:ss"
        My.Application.Culture.DateTimeFormat.ShortTimePattern = "HH:mm:ss"
    End Sub


End Class

回答8:

Rather than changing the connection string, you can use the IsValidDateTime property of the MySqlDateTime object to help you determine if you can cast the object as a DateTime.

I had a scenario where I was trying to load data from an "UpdateTime" column that was only explicitly set when there was an update to the row (as opposed to the InsertedTime which was always set). For this case, I used the MySqlDataReader.GetMySqlDateTime method like so:

using (MySqlDataReader reader = await MySqlHelper.ExecuteReaderAsync(...))
{
    if (await reader.ReadAsync())
    {
        DateTime? updateTime = reader.GetMySqlDateTime("UpdateTime").IsValidDateTime ? (DateTime?)reader["UpdateTime"] : null;
    }
}

回答9:

if "allow zero datetime=true" is not working then use the following sollutions:-

Add this to your connection string: "allow zero datetime=no" - that made the type cast work perfectly.

回答10:

In a Stimulsoft report add this parameter to the connection string (right click on datasource->edit)

Convert Zero Datetime=True;

来源：https://stackoverflow.com/questions/5754822/unable-to-convert-mysql-date-time-value-to-system-datetime