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File.SetLastWriteTimeUtc Method

Note: This namespace, class, or member is supported only in version 1.1 of the .NET Framework.

Sets the date and time, in coordinated universal time (UTC), that the specified file was last written to.

[Visual Basic]
Public Shared Sub SetLastWriteTimeUtc( _
   ByVal path As String, _
   ByVal lastWriteTimeUtc As DateTime _
public static void SetLastWriteTimeUtc(
 string path,
 DateTime lastWriteTimeUtc
public: static void SetLastWriteTimeUtc(
 String* path,
 DateTime lastWriteTimeUtc
public static function SetLastWriteTimeUtc(
   path : String,
 lastWriteTimeUtc : DateTime


The file for which to set the date and time information.
A DateTime containing the value to set for the last write date and time of path. This value is expressed in UTC time.


Exception Type Condition
ArgumentException path is a zero-length string, contains only white space, or contains one or more invalid characters as defined by InvalidPathChars.
ArgumentNullException path is a null reference (Nothing in Visual Basic).
PathTooLongException The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters, and file names must be less than 260 characters.
FileNotFoundException The specified path was not found.
UnauthorizedAccessException The caller does not have the required permission.
NotSupportedException path is in an invalid format.


The path parameter is permitted to specify relative or absolute path information. Relative path information is interpreted as relative to the current working directory. To obtain the current working directory, see GetCurrentDirectory.

The following table lists examples of other typical or related I/O tasks.

To do this... See the example in this topic...
Write to a text file. Writing Text to a File
Read from a text file. Reading Text from a File
Append text to a file. Opening and Appending to a Log File



Rename or move a file. File.Move



Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

.NET Framework Security: 

See Also

File Class | File Members | System.IO Namespace | Working with I/O | Reading Text from a File | Writing Text to a File