Changing the date of a file

Hi,

I try to change the date of a file:

Code:

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MsgBox FileSystem.FileDateTime("C:\temp\test.txt")

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No problem! I can see the date of the file!

Code:

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FileSystem.FileDateTime("C:\temp\test.txt") = Now - 3

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But why doesn't that work! VB says "Object Required"

Thanks for your help!

At the moment, i can tell you why it doesn't work.

Because FileDateTime allow you to get the date, not to set the date. It's a kind of function that return a value.

To change the date, try an API. Link:
http://www.vbapi.com/ref/s/systemtimetofiletime.html

Hope that'll help

Code:

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Option Explicit
 
Private Type FILETIME
    dwLowDateTime As Long
    dwHighDateTime As Long
End Type

Private Type SYSTEMTIME
    wYear As Integer
    wMonth As Integer
    wDayOfWeek As Integer
    wDay As Integer
    wHour As Integer
    wMinute As Integer
    wSecond As Integer
    wMilliseconds As Integer
End Type

Private Const GENERIC_WRITE = &H40000000
Private Const OPEN_EXISTING = 3
Private Const FILE_SHARE_READ = &H1
Private Const FILE_SHARE_WRITE = &H2

Private Declare Function SetFileTimeWrite Lib "kernel32" Alias "SetFileTime" (ByVal hFile As Long, ByVal MullP As Long, ByVal NullP2 As Long, lpLastWriteTime As FILETIME) As Long
Private Declare Function SystemTimeToFileTime Lib "kernel32" (lpSystemTime As SYSTEMTIME, lpFileTime As FILETIME) As Long
Private Declare Function CreateFile Lib "kernel32" Alias "CreateFileA" (ByVal lpFileName As String, ByVal dwDesiredAccess As Long, ByVal dwShareMode As Long, ByVal lpSecurityAttributes As Long, ByVal dwCreationDisposition As Long, ByVal dwFlagsAndAttributes As Long, ByVal hTemplateFile As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function LocalFileTimeToFileTime Lib "kernel32" (lpLocalFileTime As FILETIME, lpFileTime As FILETIME) As Long

Private Sub Command1_Click()
    Dim year As Integer, Month As Integer
    Dim Day As Integer, Hour As Integer
    Dim Minute As Integer, Second As Integer
    Dim TimeStamp As Variant
    Dim Filename As String
    Dim X As Integer
    Dim i As Integer
   
   
      year = Format(Date, "yyyy")
      Month = Format(Date, "mm")
      Day = Format(Date, "dd")
      Hour = Format(Time, "hh")
      Minute = Format(Time, "nn")
      Second = Format(Time, "ss")
 
   
    TimeStamp = DateSerial(year, Month, Day) + TimeSerial(Hour, Minute, Second)
 
      X = ModifyFileStamp(Filename, TimeStamp)
 
End Sub

Function ModifyFileStamp(Filename As String, TimeStamp As Variant) As Integer
    Dim X As Long
    Dim Handle As Long
    Dim System_Time As SYSTEMTIME
    Dim File_Time As FILETIME
    Dim Local_Time As FILETIME

    System_Time.wYear = year(TimeStamp)
    System_Time.wMonth = Month(TimeStamp)
    System_Time.wDay = Day(TimeStamp)
    System_Time.wDayOfWeek = Weekday(TimeStamp) - 1
    System_Time.wHour = Hour(TimeStamp)
    System_Time.wMinute = Minute(TimeStamp)
    System_Time.wSecond = Second(TimeStamp)
    System_Time.wMilliseconds = 0

    'convert the system time to a file time
    X = SystemTimeToFileTime(System_Time, Local_Time)

    'convert local file time to file time based on UTC
    X = LocalFileTimeToFileTime(Local_Time, File_Time)

    'open the file so we can get a file handle to the file
    Handle = CreateFile(Filename, GENERIC_WRITE, FILE_SHARE_READ Or FILE_SHARE_WRITE, ByVal 0&, OPEN_EXISTING, 0, 0)

    'now change the file time and date stamp
    X = SetFileTimeWrite(Handle, ByVal 0&, ByVal 0&, File_Time)
    CloseHandle Handle

End Function

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Thanks MARK.... WORKS PERFECT!!!!