System.DateTime Methods (LINQ to SQL)

The following LINQ to SQL-supported methods, operators, and properties are available to use in LINQ to SQL queries. When a method, operator or property is unsupported, LINQ to SQL cannot translate the member for execution on the SQL Server. You may use these members in your code, however, they must be evaluated before the query is translated to Transact-SQL or after the results have been retrieved from the database.

Supported System.DateTime Members

Once mapped in the object model or external mapping file, LINQ to SQL allows you to call the following System.DateTime members inside LINQ to SQL queries.

Members Not Supported by LINQ to SQL

The following members are not supported inside LINQ to SQL queries.

Method Translation Example

All methods supported by LINQ to SQL are translated to Transact-SQL before they are sent to SQL Server. For example, consider the following pattern.

(dateTime1 – dateTime2).{Days, Hours, Milliseconds, Minutes, Months, Seconds, Years}

When it is recognized, it is translated into a direct call to the SQL Server DATEDIFF function, as follows:

DATEDIFF({DatePart}, @dateTime1, @dateTime2)

SQLMethods Date and Time Methods

In addition to the methods offered by the DateTime structure, LINQ to SQL offers the methods listed in the following table from the System.Data.Linq.SqlClient.SqlMethods class for working with date and time.

See Also

Reference

SQL-CLR Type Mapping (LINQ to SQL)

Other Resources

Query Concepts in LINQ to SQL

Creating the Object Model (LINQ to SQL)

Data Types and Functions (LINQ to SQL)