DateTime.ToFileTime() 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 the current DateTime object to a Windows file time. Syntax: public long ToFileTime (); Return Value: This method returns the value of the current DateTime object expressed as a Windows file time. Exception: This method will give ArgumentOutOfRangeException if the resulting file time would represent a date and time before 12:00 midnight January 1, 1601 C.E. UTC. Below programs illustrate the use of DateTime.ToFileTime() Method: Example 1: csharp // C# program to demonstrate the // DateTime.ToFileTime() // 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); // converting current DateTime // object to a Windows file time. // using ToFileTime() method; long value = date.ToFileTime(); // Display the TimeSpan Console.WriteLine("Windows file time "+ "is {0}", value); } catch (ArgumentOutOfRangeException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } } Output: Windows file time is 129383280150000000 Example 2: For ArgumentOutOfRangeException csharp // C# program to demonstrate the // DateTime.ToFileTime() // Method using System; using System.Globalization; class GFG { // Main Method public static void Main() { try { // creating object of DateTime DateTime date = new DateTime(1600, 1, 1, 4, 0, 15); // converting current DateTime // object to a Windows file time. // using ToFileTime() method; long value = date.ToFileTime(); // Display the TimeSpan Console.WriteLine("Windows file time"+ " is {0}", value); } catch (ArgumentOutOfRangeException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } } Output: Exception Thrown: System.ArgumentOutOfRangeException Reference: https://learn.microsoft.com/en-us/dotnet/api/system.datetime.tofiletime?view=netframework-4.7.2 Comment More infoAdvertise with us Next Article Introduction to .NET Framework R rohitprasad3 Follow Improve Article Tags : C# CSharp-method CSharp DateTime Struct Similar Reads IntroductionC# TutorialC# (pronounced "C-sharp") is a modern, versatile, object-oriented programming language developed by Microsoft in 2000 that runs on the .NET Framework. 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C# has multiple indexers in a single class. To overload an indexer, declare it with multiple parameters an 3 min read Like