How Can I Resolve a DateTime2 to DateTime Out-of-Range Conversion Error When Saving Data to a SQL Server Database?

Out-of-range conversion error from DateTime2 to DateTime

Question:

When saving DataTable data containing a DateTime column to the database, an error occurs indicating that the conversion from DateTime2 to DateTime data type is out of range. This problem persists despite the correct assignment of data types in the code and database.

Question:

Can this conversion error be solved with code modifications, or does it require database changes?

Answer:

Short answer:

Yes, initializing a value for the DateTime field solves this problem. Since DateTime does not accept NULL values, it is crucial to assign a default value.

Detailed answer:

The default value for non-nullable DateTime types in C# is DateTime.MinValue (01/01/0001), which is an invalid range for SQL Server DateTime. This difference is because SQL Server DateTime has a minimum valid date of 01/01/1753 due to its Gregorian calendar system. However, DateTime2 in Entity Framework allows dates starting from 01/01/0001.

When saving data from a DateTime2 field in Entity Framework, it is implicitly cast to DateTime on the SQL Server side. This conversion triggers an out-of-range error. To resolve this issue, explicitly initializing the DateTime field with a valid value within the allowed range will prevent conversion errors.

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