Rename multiple files as "Modified Date/Time" using cmd or Powershell

I have hundreds of JPG files in a folder. I want to rename each file so that the file name is replaced with "Modified Date/Time" of that file, namely DD.MM.RRRR.HH.MM.jpg. For example,

Before After
001.jpg 11.01.2011.16.58.jpg
002.jpg 12.01.2011.09.32.jpg
003.jpg 14.01.2011.12.41.jpg
... ...

Since colon (:) cannot be used in file names, the colon between HH and MM must be replaced with a period.

I don't want to use a 3rd party tool. Can you provide me with the code to achieve this in Powershell or command line?

2 Answers

Try this in Powershell:

Get-ChildItem *.jpg | Rename-Item -newname {$_.LastWriteTime.toString("dd.MM.yyyy.HH.mm") + ".jpg"}

I hope you guys don't mind my feedback here.

'Rename-Item' gave me this error:Rename-Item : Cannot create a file when that file already exists.

So I've added to Siim K's solution as follows and ran this within 'Windows Powershell ISE':

Get-ChildItem *.jpg |ForEach-Object { $NewName = $_.LastWriteTime.toString("yyyy.MM.dd.HH.mm.ss.ss")+($script:i++) + ".jpg" $Destination = Join-Path -Path $_.Directory.FullName -ChildPath $NewName Move-Item -Path $_.FullName -Destination $Destination -Force
}

I found the 'yyyy.MM.dd.mm.ss.ss' order listed my images better and I recognized than none of my image count was reduced (accidentally purged) within the folder as well. I hope this is helpful to other 'superusers' (beginner or experienced).