How to Resolve 'Out-of-Range' Errors When Converting DateTime2 to DateTime in SQL Server?

Resolve out-of-bounds error in type conversion from DateTime2 to DateTime

Problem Description

While trying to save data from a data table containing a DateTime column to the database, I encountered the following error:

<code>将 datetime2 数据类型转换为 datetime 数据类型导致越界值。</code>

Although the error message states that the data types do not match, the data type of both the data table and database columns is DateTime.

Question

Can this problem be solved through code, or does the database configuration need to be modified?

Solution

This error occurs because the DateTime field in the data table is not explicitly initialized to a valid value. As a value type, DateTime does not accept null values ​​and defaults to its minimum value of 01/01/0001. However, the minimum valid date for SQL Server's DateTime data type is 01/01/1753.

Solution:

1. Short answer: Initialize the DateTime field in the data table to a valid date before saving the data.

2. Detailed answer:

   • The default value for non-nullable DateTime types is DateTime.MinValue.
   • SQL Server supports dates starting from 01/01/1753, while DateTime2 supports dates starting from 01/01/0001.
   • Entity Framework uses DateTime2 by default, which results in an implicit conversion to DateTime in SQL Server.

   To avoid out-of-bounds errors:

   • Set an explicit value for the DateTime field in the data table before saving the data.
   • Consider using DateTime2 (using DateTimeOffset in Entity Framework) to support dates earlier than 01/01/1753.

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