This documentation is archived and is not being maintained.

DateTime.AddHours Method

Adds the specified number of hours to the value of this instance.

[Visual Basic]
Public Function AddHours( _
   ByVal value As Double _
) As DateTime
public DateTime AddHours(
 double value
public: DateTime AddHours(
 double value
public function AddHours(
   value : double
) : DateTime;


A number of whole and fractional hours. The value parameter can be negative or positive.

Return Value

A DateTime whose value is the sum of the date and time represented by this instance and the number of hours represented by value.


Exception Type Condition
ArgumentOutOfRangeException The resulting DateTime is less than MinValue or greater than MaxValue.


This method does not change the value of this DateTime. Instead, a new DateTime is returned whose value is the result of this operation.

The fractional part of value is the fractional part of an hour. For example, 4.5 is equivalent to 4 hours, 30 minutes, 0 seconds, 0 milliseconds, and 0 ticks.

The value parameter is rounded to the nearest tick.


Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family, .NET Compact Framework, Common Language Infrastructure (CLI) Standard

See Also

DateTime Structure | DateTime Members | System Namespace | Double