Find All Documents Created or Modified by a Particular User in Specific Date Time

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

# Set the date Filter
$dateFilter = (Get-Date).AddMonths(-1) #Past Month
"File, Created Time, File Size" | out-file NewDocuments.csv

# Get all Webs
$webs = Get-SPWebApplication "https://sharepoint.crescent.com" | Get-SPSite -Limit All | Get-SPWeb -Limit All

#Iterate through webs
ForEach ($web in $webs) 
{
	#Iterate through All Lists
	ForEach ($list in $web.Lists) 
	{
		#Check for Document Libraries  
		If ($list.BaseType -eq "DocumentLibrary") 
		{
			#Iterate through All documents
			ForEach ($item in $list.Items)
			{
				If ($item.URL.StartsWith("_")) {Break} #Skip _catalogs, etc
				If ($item.URL.EndsWith(".aspx")) {Break} #Skip Form pages
				If ($item.File.TimeCreated -ge $dateFilter) 
				{
					$result = """$($web.URL)/$($item.URL)"", $($item.File.TimeCreated), $( [Math]::Round($item.File.Length/1024,2))"
					$result | Out-File NewDocuments.csv -Append
				}
			}
		}
	}
}

[void][System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SharePoint")

#Region MOSS2007-CmdLets
Function global:Get-SPWebApplication($WebAppURL)
{ 
 if($WebAppURL -eq $null)  #Get All Web Applications
    {
  #Sharepoint 2007 powershell spfarm
  $Farm = [Microsoft.SharePoint.Administration.SPFarm]::Local
  $websvcs = $farm.Services | where -FilterScript {$_.GetType() -eq [Microsoft.SharePoint.Administration.SPWebService]}
  $WebApps = @()
  foreach ($websvc in $websvcs) {
      foreach ($WebApp in $websvc.WebApplications) {
          $WebApps += $WebApp
      }
  }
  return $WebApps
 }
  else #Get Web Application for given URL
 {
    return [Microsoft.SharePoint.Administration.SPWebApplication]::Lookup($WebAppURL)
  }
 }
 
Function global:Get-SPSite()
{
  Param( [Parameter(Mandatory=$true)] [string]$SiteCollURL )
 
   if($SiteCollURL -ne '')
    {
    return new-Object Microsoft.SharePoint.SPSite($SiteCollURL)
   }
}

Function global:Get-SPWeb()
{
 Param( [Parameter(Mandatory=$true)] [string]$SiteURL )
  $site = Get-SPSite($SiteURL)
        if($site -ne $null)
            {
               $web=$site.OpenWeb();
            }
    return $web
}
#EndRegion


# Set the date Filter
"File Name `t Created By `t Modified By `t Created `t Last Modified `t File Size `t URL" | out-file AllDocsByUser.csv
 
# Get the Web Application 
$WebApp = Get-SPWebApplication "https://sharepoint.company.com"

#Iterate through site collections
ForEach ($site in $WebApp.Sites)
    {
     #Iterate through webs
     ForEach ($web in $site.AllWebs)
        {
            #Iterate through All Lists
            ForEach ($list in $web.Lists)
            {
            #Check for Document Libraries 
            If ($list.BaseType -eq "DocumentLibrary")
               {
                #Iterate through All documents
                ForEach ($item in $list.Items)
                    {
                        If ($item.URL.StartsWith("_")) {Break} #Skip _catalogs, etc
                        If ($item.URL.EndsWith(".aspx")) {Break} #Skip Form pages
                      
                        If ( ($item.File.Author -like "*domain\user*") -or ($item.File.ModifiedBy -like "*domain\user*"))
                           {
                             $result = "$($item.File.Name) `t $($item.File.Author) `t $($item.File.ModifiedBy) `t $($item.File.TimeCreated) `t $($item.File.TimeLastModified) `t  $( [Math]::Round($item.File.Length/1024,2)) `t $($web.URL)/$($item.URL)"
                              $result | Out-File AllDocsByUser.csv -Append
                           }
                     }
                }
           }
      }
  }