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Editorial Team
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Asked: 2026-06-18T10:28:11+00:00

I am writing a VB.NET application that moves data from a MS SQL database

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I am writing a VB.NET application that moves data from a MS SQL database table to an Oracle database table.

A record in the MS SQL DB has a null date. The Oracle db table column is set to allow nulls. When I run the VB.NET application and step through the app, everything works fine until the record with the null date. VB.NET shows the null date as ’12:00 AM’ with no date, just the time.

The Oracle error I get is: ORA-01847: day of month must be between 1 and last day of month

Here is the SQL to pull in the date from the MS SQL DB:

convert(varchar(10),DATE_COLUMN,101) end as 'DATE_COLUMN'

Here is the PL/SQL I have for inserting into the Oracle DB:

to_date('" & tmp_DATE_COLUMN & "','mm/dd/yyyy')

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1 Answer

  1. Editorial Team

    Looks like your tmp_something_DATE variable is of type Date. Problem is that it cannot store NULL/Nothing values in a Date variable. If you try to assign a Date to Nothing, it is really assigned to Date.MinValue, which equals to #12:00:00 AM#. You either need Nullable(Of Date) or use DataTable column values directly.

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