Friday, August 29, 2008

Converting filetime with vbs and PowerShell

This post provides two methods of converting the 64-bit Windows filetime structure - the Windows Epoch giving the number of 100 nanosecond intervals since 01/01/1601 UTC.

The first is PowerShell which is relatively easy, compared to the second which is some VBScript that I have used upon occasion, typically when I'm trying to convert 64-bit integers from AD (eg returned from dsquery pwdlastset), or vice versa.

Neither of these scripts are revolutionary, but I haven't come across a simple function to convert between the two in vbs, and I thought I'd include the powershell for comparison.

# ConvertFileTime.ps1
$now = [datetime]::Now

$fileTime = $now.ToFileTime()

# This then parses the date, determining whether it is a valid date or not (in this case it always will be beacuse it's from datetime, but you could use this to parse other date strings, using your culture)
foreach ($date in [string[]]$now.ToString()) {
  write-output $date
  $oCulture= [System.Globalization.CultureInfo]"en-AU"
  $dtOut = new-object DateTime
  [datetime]::TryParse($date, $oCulture, [System.Globalization.DateTimeStyles]::None, [ref]$dtOut)
  [datetime]::TryParse($date, [ref]$dtOut)


' ConvertFileTime.vbs
' VBScript doesn't support 64-bit integers, so it can't handle the number of 100 nanosecond intervals since 01/01/1601

' Either use ADSI provider and the IADs/IADsLargeInteger object
' LargeIntValue = objLargeInt.HighPart * 2^32 + objLargeInt.LowPart

' Or WMI, which handles the conversion between 64-bit datetime structure / UTC / and VB var datetime

If Wscript.Arguments.UnNamed.Count > 0 Then 
 strDateTime = Wscript.Arguments.UnNamed(0)

 Set objDateTime = CreateObject("WbemScripting.SWbemDateTime")

 If IsDate(strDateTime) Then
  Call objDateTime.SetVarDate(strDateTime, False)
  wscript.echo objDateTime.GetFileTime
  Call objDateTime.SetFileTime(strDateTime, False)
  wscript.echo objDateTime.GetVarDate
 End If

 intReturn = 0
 WScript.Echo "Specify a filetime or a date to convert, eg 127076450620627215, or ""11/04/2006 11:17:10 AM"""
 intReturn = 2
End If


Wayne's World of IT (WWoIT), Copyright 2008 Wayne Martin.


Daz Collins said...

Nice one, cheers! :o)

Swapnil Tamhane said...

Thank you so much. You are a lifesaver! This script helped me convert list of 7039 file time dates to readable datetime format.

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About Me

I’ve worked in IT for over 20 years, and I know just about enough to realise that I don’t know very much.