$site=get-spsite http://sp/sites/Echo  // the specific site URL

$date= $(get-date).AddMonths(-2)
$ct = @()
foreach($Web in $site.AllWebs)
    {
        foreach($list in $Web.Lists)
        {
            if($list.BaseTemplate -eq "DocumentLibrary" -and $list.AllowContentTypes -eq $true)  // All Document Libraries           
            {
		foreach ($listItem in $list.Items)
		{				
			$created=[datetime]($listItem["Created"])
			if($created -gt $date)
			{
	                    $ctObject = New-Object -TypeName PSObject
                            $ctObject | Add-Member -Name 'WebUrl' -MemberType Noteproperty -Value $web.URL
                            $ctObject | Add-Member -Name 'ListTitle' -MemberType Noteproperty -Value $list.Title                                
                            $ctObject | Add-Member -Name 'FileUrl' -MemberType Noteproperty -Value $listItem.URL
			    $ctObject | Add-Member -Name 'FileName' -MemberType Noteproperty -Value $listItem.name
                            $ctObject | Add-Member -Name 'CreatedTime' -MemberType Noteproperty -Value $listItem["Created"]
     
                            $ct += $ctObject 					
			}
		}
			
	     }
	}
     }
	
$ct | export-csv "C:\report.csv" // the location of Report