Below I write a powershell script to get the author and date of creation of SharePoint List. Today I have suddenly found out the new list. I was very surprised to see it and wanted to know who and when created it.

#Get author of SharePoint list and date it was created 

Add-PSSnapin Microsoft.SharePoint.PowerShell -erroraction SilentlyContinue   
$url  = "http://mysite/mysubsite/" 
$spweb = Get-SPWeb $url 

$list = $spweb.Lists["my List Name"] 
Write-Host "List Author: " $list.Author, "created"  $list.Created