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SqlFunctions.DateDiff Method (String, String, Nullable(Of DateTime))

Returns the count of the specified datepart boundaries crossed between the specified start date and end date.

Namespace:  System.Data.Objects.SqlClient
Assembly:  System.Data.Entity (in System.Data.Entity.dll)

<EdmFunctionAttribute("SqlServer", "DATEDIFF")> _
Public Shared Function DateDiff ( _
	datePartArg As String, _
	startDate As String, _
	endDate As Nullable(Of DateTime) _
) As Nullable(Of Integer)


Type: System.String
The part of the date to calculate the differing number of time intervals.
Type: System.String
The first date.
Type: System.Nullable(Of DateTime)
The second date.

Return Value

Type: System.Nullable(Of Int32)
The number of time intervals between the two dates.

You cannot call this function directly. This function can only appear within a LINQ to Entities query.

This function is translated to a corresponding function in the database. For information about the corresponding SQL Server function, see DATEDIFF (Transact-SQL).

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.