DateTime.FromFileTime() Method in C# - GeeksforGeeks

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) Methodusing 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);        }    }}
DateTime before operation: 2010 March 14

DateTime after operation: 1601 January 03

Example 2: For ArgumentOutOfRangeException
// C# program to demonstrate the// DateTime.FromFileTime() Methodusing 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);        }    }}
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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