DateTime.FromFileTime() Method in C#

DateTime.FromFileTime(Int64) Method is used to converts the specified Windows file time to an equivalent local time.

Syntax: public static DateTime FromFileTime (long fileTime); Here, it takes a Windows file time expressed in ticks. 

Return Value: This method returns an object that represents the local time equivalent of the date and time represented by the fileTime parameter. 

Exception: This method will give ArgumentOutOfRangeException if the fileTime is less than 0 or represents a time greater than MaxValue.

Below programs illustrate the use of DateTime.FromFileTime(Int64) Method: 

Example 1:

csharp

// C# program to demonstrate the
// DateTime.FromFileTime(Int64) Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {
        try {

            // creating object of DateTime
            DateTime date1 = new DateTime(2010, 3, 14, 2, 30, 00);

            // converting 2500000000000 file
            // time represented in ticks
            // into DateTime format
            // using FromFileTime() method
            DateTime date2 = DateTime.FromFileTime(2500000000000);

            // Display the date1
            System.Console.WriteLine("DateTime before "
                   + "operation: {0:y} {0:dd}", date1);


            // Display the date2
            System.Console.WriteLine("\nDateTime after"
                   + " operation: {0:y} {0:dd}", date2);

        }

        catch (ArgumentOutOfRangeException e)
        {
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

DateTime before operation: 2010 March 14

DateTime after operation: 1601 January 03

Example 2: For ArgumentOutOfRangeException

csharp

// C# program to demonstrate the
// DateTime.FromFileTime() Method
using System;
using System.Globalization;

class GFG {

    // Main Method
    public static void Main()
    {

        try {

            // creating object of DateTime
            DateTime date1 = new DateTime(2010, 3,
                                   14, 2, 30, 00);

            // converting -1 file time
            // represented in ticks
            // into DateTime format
            // using FromFileTime() method
            DateTime date2 = DateTime.FromFileTime(-1);

            // Display the date1
            System.Console.WriteLine("DateTime before "
                     + "operation: {0:y} {0:dd}",date1);


            // Display the date2
            System.Console.WriteLine("\nDateTime after"
                   + " operation: {0:y} {0:dd}", date2);

        }

        catch (ArgumentOutOfRangeException e) {
            Console.WriteLine("fileTime is less than 0 ");
            Console.Write("Exception Thrown: ");
            Console.Write("{0}", e.GetType(), e.Message);
        }
    }
}

Output:

fileTime is less than 0 
Exception Thrown: System.ArgumentOutOfRangeException

Reference:

• https://docs.microsoft.com/en-us/dotnet/api/system.datetime.fromfiletime?view=netframework-4.7.2