DateTime.ToOADate() Method in C# Last Updated : 11 Jul, 2025 Comments Improve Suggest changes Like Article Like Report This method is used to convert the value of this instance to the equivalent OLE Automation date. Syntax: public double ToOADate (); Return Value: This method returns a double-precision floating-point number that contains an OLE Automation date equivalent to the value of this instance. Exception: OverflowException: If the value of this instance cannot be represented as an OLE Automation Date. Below programs illustrate the use of DateTime.ToOADate() Method Example 1: csharp // C# program to demonstrate the // DateTime.ToOADate() Method using System; using System.Globalization; class GFG { // Main Method public static void Main() { try { // creating object of DateTime DateTime date = new DateTime(2011, 1, 1, 4, 0, 15); // Converts the value of this instance to // the equivalent OLE Automation date. // using ToOADate() method; double value = date.ToOADate(); // Display the time Console.WriteLine("OLE Automation date is {0}", value); } catch (OverflowException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } } Output: OLE Automation date is 40544.1668402778 Example 2: For OverflowException csharp // C# program to demonstrate the // DateTime.ToOADate() Method using System; using System.Globalization; class GFG { // Main Method public static void Main() { try { // creating object of DateTime DateTime date = new DateTime(0099, 1, 1, 4, 0, 15); // Converts the value of this instance // to the equivalent OLE Automation date. // using ToOADate() method; double value = date.ToOADate(); // Display the time Console.WriteLine("OLE Automation date is {0}", value); } catch (OverflowException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } } Output: Exception Thrown: System.OverflowException Reference: https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tooadate?view=netframework-4.7.2 Create Quiz Comment R rohitprasad3 Follow 0 Improve R rohitprasad3 Follow 0 Improve Article Tags : C# CSharp-method CSharp DateTime Struct Explore IntroductionC# Tutorial 2 min read Introduction to .NET Framework 6 min read C# .NET Framework (Basic Architecture and Component Stack) 6 min read C# Hello World 2 min read Common Language Runtime (CLR) in C# 4 min read FundamentalsC# Identifiers 2 min read Data Types in C# 6 min read C# Variables 4 min read C# Literals 5 min read Operators in C# 7 min read C# Keywords 5 min read Control StatementsC# Decision Making (if, if-else, if-else-if ladder, nested if, switch, nested switch) 5 min read C# Switch Statement 4 min read Loops in C# 4 min read C# Jump Statements (Break, Continue, Goto, Return and Throw) 4 min read OOP ConceptsClass and Objects in C# 4 min read Constructors in C# 5 min read C# Inheritance 3 min read Encapsulation in C# 2 min read C# Abstraction 4 min read MethodsMethods in C# 4 min read Method Overloading in C# 4 min read Method Parameters in C# 4 min read Method Overriding in C# 7 min read Anonymous Method in C# 2 min read ArraysArrays in C# 6 min read Jagged Arrays in C# 4 min read Array Class in C# 5 min read How to Sort an Array in C# | Array.Sort() Method Set - 1 8 min read How to find the rank of an array in C# 2 min read ArrayListArrayList in C# 6 min read ArrayList Class in C# 4 min read C# | Array vs ArrayList 2 min read StringStrings in C# 6 min read C# Verbatim String Literal - @ 5 min read C# String Class 9 min read C# StringBuilder 2 min read C# String vs StringBuilder 3 min read TupleC# Tuple 7 min read C# Tuple Class 3 min read C# ValueTuple 7 min read C# ValueTuple Struct 4 min read IndexersC# Indexers 5 min read C# Multidimensional Indexers 5 min read C# - Overloading of Indexers 3 min read Like