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DateTime.ToOADate Method

Converts the value of this instance to the equivalent OLE Automation date.

Namespace:  System
Assembly:  mscorlib (in mscorlib.dll)

'Declaration
Public Function ToOADate As Double

Return Value

Type: System.Double
A double-precision floating-point number that contains an OLE Automation date equivalent to the value of this instance.

ExceptionCondition
OverflowException

The value of this instance cannot be represented as an OLE Automation Date.

An OLE Automation date is implemented as a floating-point number whose integral component is the number of days before or after midnight, 30 December 1899, and whose fractional component represents the time on that day divided by 24. For example, midnight, 31 December 1899 is represented by 1.0; 6 A.M., 1 January 1900 is represented by 2.25; midnight, 29 December 1899 is represented by -1.0; and 6 A.M., 29 December 1899 is represented by -1.25.

The base OLE Automation Date is midnight, 30 December 1899. The minimum OLE Automation date is midnight, 1 January 0100. The maximum OLE Automation Date is the same as DateTime.MaxValue, the last moment of 31 December 9999.

The ToOADate method throws an OverflowException if the current instance represents a date that is later than MinValue and earlier than midnight on January1, 0100. However, if the value of the current instance is MinValue, the method returns 0.

For more information about OLE Automation, see the MSDN Library.

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

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