Add-pssnapin microsoft.teamfoundation.powershell
#snapin from http://pstfs.codeplex.com/
add-pssnapin ServerTFSPSSnapIn
cls ;

#variables
$destPath = "$env:USERPROFILE\My Documents\_Development\TFS_Scripts\LeftOnly.txt"
$TFserver = "localhost"
$serverpathL = "$/Data Warehouse/D4.0"
$serverpathR = "$/Data Warehouse/D5.0"
[datetime]$startDate = "1/1/2011"
$tfs = get-tfsServer $TFserver

$item = (get-diff -tfs $tfs -pathl $serverpathL -pathr $serverpathR ) |foreach{$_|?{($_.TypeDiff -eq 'Diff' -or $_.TypeDiff -eq 'LeftOnly') -and $_.DateCheckInL -ge $startDate }}

#Left only Files (Basically the same logic for RightOnly)
if (test-path $DestPath) {del $DestPath}

$left = $item | select information,DateCheckInL, TypeDiff, ItemL |?{$_.TypeDiff -eq 'LeftOnly'} |sort DateCheckInL -descending
"Owner`tChangeSetID`tDateCheckedIn`tServerItem"|set-content $DestPath
foreach($l in $left) {
   $serverItem = $l.Information
   $DateCheckedIn = ($l.DateCheckInL).tostring()
   $ChangeSetID = $L.ItemL.ChangeSetID
   $owner = (get-tfsItemhistory $serverItem -server $tfServer -stopafter 1).Owner
   "$owner`t$ChangeSetID`t$DateCheckedIn`t$serverItem"|add-content $DestPath
}
#get-content $DestPath

#Diff Files
$destPath = "$env:USERPROFILE\My Documents\_Development\TFS_Scripts\Diff.txt"

$diff = (get-diff -tfs $tfs -pathl $serverpathL -pathr $serverpathR) |foreach{$_|?{$_.TypeDiff -eq 'Diff' -and $_.DateCheckInL -ge $startDate -and $_.DateCheckInL -gt $_.DateCheckInR }}|sort DateCheckInL -descending

if (test-path $DestPath) {del $DestPath}

"Owner`tD4_ChangeSetID`tD4_DateCheckedIn`tD5_ChangeSetID`tD5_DateCheckedIn`tServerItem"|set-content $DestPath

foreach($d in $diff){
    $s = $d.Information -split " - "
    $L = get-tfsitemproperty $s[0] -server $TFserver -workspace $workspace
    $R = get-tfsitemproperty $s[1] -server $TFserver -workspace $workspace
    $Owner = (get-tfsItemhistory $L.SourceServerItem -server $tfServer -stopafter 1).Owner
    $ChangeSetL = $d | select -ExpandProperty ItemL |select changesetid, checkindate
    $ChangeSetR = $d | select -ExpandProperty ItemR|select changesetid, checkindate
    "$Owner`t"+ $ChangeSetL.changesetid + "`t" + ($ChangeSetL.CheckinDate).Tostring()+"`t"+$ChangeSetR.changesetid + "`t" + ($ChangeSetR.CheckinDate).Tostring()+"`t"+$L.SourceServerItem |add-content $DestPath
}
#get-content $DestPath

#compare-object $(get-content $L.LocalItem) $(get-content $R.LocalItem)

Compares two TFS paths after $startdate and returns a list of files that are different. 
First section outputs owner, changeset, servername that are only on the Left side. 
The second outputs owner, changeset L&R, servername for files that are different. Constrained to files where the Left side change date is after the right side change date.

Compare TFS Server Paths

Windows PowerShell