Information
The topic you requested is included in another documentation set. For convenience, it's displayed below. Choose Switch to see the topic in its original location.
1 out of 3 rated this helpful - Rate this topic

DateTime.ToFileTime Method

Converts the value of the current DateTime object to a Windows file time.

Namespace: System
Assembly: mscorlib (in mscorlib.dll)

public long ToFileTime ()
public long ToFileTime ()
public function ToFileTime () : long
Not applicable.

Return Value

The value of the current DateTime object expressed as a Windows file time.
Exception typeCondition

ArgumentOutOfRangeException

The resulting file time would represent a date and time before 12:00 midnight January 1, 1601 C.E. UTC.

A Windows file time is a 64-bit value that represents the number of 100-nanosecond intervals that have elapsed since 12:00 midnight, January 1, 1601 A.D. (C.E.) Coordinated Universal Time (UTC). Windows uses a file time to record when an application creates, accesses, or writes to a file.

Previous versions of the ToFileTime method assume the current DateTime object is a local time. Starting with the.NET Framework version 2.0, the ToFileTime method uses the Kind property to determine whether the current DateTime object is a local time, a UTC time, or an unspecified kind of time which is treated as a local time.

The following code example demonstrates the ToFileTime method.

static void Main(string[] args)
{
    System.Console.WriteLine("Enter the file path:");
    string filePath = System.Console.ReadLine();

    if (System.IO.File.Exists(filePath)) {
        System.DateTime fileCreationDateTime = 
            System.IO.File.GetCreationTime(filePath);

        long fileCreationFileTime = fileCreationDateTime.ToFileTime();

        System.Console.WriteLine("{0} in file time is {1}.",
                                 fileCreationDateTime,
                                 fileCreationFileTime);
    } 
    else {
        System.Console.WriteLine("{0} is an invalid file", filePath);
    }
}

public static void main(String[] args)
{
    System.Console.WriteLine("Enter the file path:");
    String filePath = System.Console.ReadLine();

    if (System.IO.File.Exists(filePath)) {
        System.DateTime fileCreationDateTime = System.IO.File.
            GetCreationTime(filePath);
        long fileCreationFileTime = fileCreationDateTime.ToFileTime();
        System.Console.WriteLine("{0} in file time is {1}.", 
        fileCreationDateTime, (Int64)fileCreationFileTime);
    }
    else {
        System.Console.WriteLine("{0} is an invalid file", filePath);
    }
} //main

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Supported in: 2.0, 1.0

XNA Framework

Supported in: 1.0
Did you find this helpful?
(1500 characters remaining)
Thank you for your feedback

Community Additions

Show:
© 2014 Microsoft. All rights reserved.