powershell and file dates

I'm writing to a log file and wanting a backup made if the creation date is earlier than today.
But apparently, even after 'renaming' the file, once it's recreated (when next written to), it retains the same creation date (yesterday) causing this block to be hit again (and obviously failing since the file already exists).

What can I do to ensure the 'new' file is written with today's date stamp?
$today = (get-date).Date
if (test-path $logFile) {
    $filedate = (Get-ChildItem $logFile).CreationTime.Date
    if ( $today -gt $filedate ) { 
        Rename-Item $logFile "$($filedate.tostring('yyyyMMdd'))_$($($MyInvocation.MyCommand.Name).Replace('.ps1','.txt'))" } 
}

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LVL 67
sirbountyAsked:
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David Johnson, CD, MVPOwnerCommented:
try the modified date
sirbountyAuthor Commented:
Reasoning?  
How can a 'new' file be generated (even though I'm probably using a -append param) and have a created date of yesterday?
jmcgOwnerCommented:
Rename does not change creation date. Nor does appending.

But I'd check your script's logic to make sure it was checking a new file object.
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Robert SchuttSoftware EngineerCommented:
How can a 'new' file be generated (...) and have a created date of yesterday?
Check out File System Tunneling, a backward compatibility feature of windows to make sure a 'safe save' (saving to a new file first and then rename to the wanted filename) does not alter certain properties of the original file. More info here.

I encountered this some time ago and was able to solve it by specifically setting the CreationDate of the file (in .NET code) as it was created again (after being moved) but have never tested changing the registry to disable this feature.
Robert SchuttSoftware EngineerCommented:
Maybe you could try something like this after the rename (untested):
New-Item $logFile -type file
(Get-ChildItem $logFile).CreationTime = Get-Date

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jmcgOwnerCommented:
I think Mr. Schutt's answer has it right. I had never heard of this behavior before.
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