DateTime.FromFileTime() Method in C#

Last Updated : 28 Jan, 2019

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:

// 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 FromBinary() 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

// 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 FromBinary() 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

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