Powershell - Parsing times from windowsupdate log

param(
    $pathbefore = 'C:\$Windows.~BT\Sources\Panther\setupact.log',
    $pathafter = "C:\WINDOWS\Panther\setupact.log",
    $dl = '[/PreDownload /Package /Quiet',
    $dlcomplete = "/install",
    $inst = '[/install',
    $reboot = 'Action Progress: [100%]',
    $finished = 'SetupPlatform: Phase "OOBEBoot" completed successfully.'
    )
$header = "Date","x","Messagetype","Modul","Message"

#DL startet = ok
#DL finish = no pattern found except installation is starting
#IS startet = ok
#first reboot =
#inst finish = ok

### LOGFILE NACH UPDATE ABFRAGEN
#DOWNLOAD STARTED
#TEST IF WE ARE BERFORE OR AFTER THE UPDATE AND PARSE CORRECT LOGFILE
if (Test-Path $pathbefore){
    #Parse Logfile from $pathbefore, replace the first 3x spaces with comma and look for pattern $dl, because of special character we use -SimpleMatch, we convert as csv to get separate attributes with own header and we want only the first value retunred
    $time1 = (get-content $pathbefore) -replace '^(\S+?) (\S+?) (\S+?) (.*)','$1 $2,$3,$4' | select-string -pattern $dl -SimpleMatch –allmatches | Convertfrom-csv -Delimiter "," -header $header | Select-Object -First 1
    #Separating the resulting line into different parts by spaces (from 1 to all spaces between) and skipping the first value containing path, filename, linenumber and date
    if($time1){$time1a = Get-Date -Date $time1.date}
    #Returns found time from logfile and removes the following comma
    Write-Host -ForegroundColor Gray "Download was started at $time1a"
    }
else{
    $time1 = (get-content $pathafter) -replace '^(\S+?) (\S+?) (\S+?) (.*)','$1 $2,$3,$4' | select-string -pattern $dl -SimpleMatch –allmatches | Convertfrom-csv -Delimiter "," -header $header | Select-Object -First 1
    if($time1){$time1a = Get-Date -Date $time1.date}
    Write-Host -ForegroundColor Gray "Download was started at $time1a"
    }




#DOWNLOAD FINISHED
if (Test-Path $pathbefore){
    $time2 = (get-content $pathbefore) -replace '^(\S+?) (\S+?) (\S+?) (.*)','$1 $2,$3,$4' | select-string -pattern $dlcomplete -SimpleMatch –allmatches | Convertfrom-csv -Delimiter "," -header $header | Select-Object -First 1
    $time2a = Get-Date -Date $time2.date
    Write-Host -ForegroundColor Gray "Download was completed at $time2a"
    }
else{
    $time2 = (get-content $pathafter) -replace '^(\S+?) (\S+?) (\S+?) (.*)','$1 $2,$3,$4' | select-string -pattern $dlcomplete -SimpleMatch –allmatches | Convertfrom-csv -Delimiter "," -header $header | Select-Object -First 1
    $time2a = Get-Date -Date $time2.date
    Write-Host -ForegroundColor Gray "Download was completed at $time2a"
    }


#INSTALLATIONS STARTED
if (Test-Path $pathbefore){
    $time3 = (get-content $pathbefore) -replace '^(\S+?) (\S+?) (\S+?) (.*)','$1 $2,$3,$4' | select-string -pattern $inst -SimpleMatch –allmatches | Convertfrom-csv -Delimiter "," -header $header | Select-Object -First 1
    $time3a = Get-Date -Date $time3.date
    Write-Host -ForegroundColor Cyan "Installation was startet at $time3a"
    }
else{
    $time3 = (get-content $pathafter) -replace '^(\S+?) (\S+?) (\S+?) (.*)','$1 $2,$3,$4' | select-string -pattern $inst -SimpleMatch –allmatches | Convertfrom-csv -Delimiter "," -header $header | Select-Object -First 1
    $time3a = Get-Date -Date $time3.date
    Write-Host -ForegroundColor Cyan "Installation was startet at $time3a"
    }

#FIRST REBOOT
if (Test-Path $pathbefore){
    $time4 = (get-content $pathbefore) -replace '^(\S+?) (\S+?) (\S+?) (.*)','$1 $2,$3,$4' | select-string -pattern $reboot -SimpleMatch –allmatches | Convertfrom-csv -Delimiter "," -header $header | Select-Object -Last 1
    $time4a = Get-Date -Date $time4.date
    Write-Host -ForegroundColor Cyan "First reboot was initiated at $time4a"
    }
else{
    $time4 = (get-content $pathafter) -replace '^(\S+?) (\S+?) (\S+?) (.*)','$1 $2,$3,$4' | select-string -pattern $reboot -SimpleMatch –allmatches | Convertfrom-csv -Delimiter "," -header $header | Select-Object -Last 1
    $time4a = Get-Date -Date $time4.date
    Write-Host -ForegroundColor Cyan "First reboot was initiated at $time4a"
    }

#INSTALLATION FINISHED, LOGFILE LOCATION BEFORE IS NOT NEEDED ANYMORE
$time5 = (get-content $pathafter) -replace '^(\S+?) (\S+?) (\S+?) (.*)','$1 $2,$3,$4' | select-string -pattern $finished -SimpleMatch –allmatches | Convertfrom-csv -Delimiter "," -header $header | Select-Object -Last 1
$time5a = Get-Date -Date $time5.date
Write-Host -ForegroundColor Green "Installation was finished at $time5a"

#SPACES BETWEEN TiMES AND CALCULTIONS
Write-Host " "
Write-Host " "



#CAlCULATE TIMES
#CALCULATE DOWNLOADTIME
# IF time1a has a value, calculate time and report to user
if ($time1a){
    $download = $time2a - $time1a
    Write-Host -ForegroundColor Gray "Download =" $download
    }
else
    {
    Write-Host -ForegroundColor Gray "No download detected"
    }

#CALCUALTE INSTALLATIONTIME
$installation = $time5a - $time3a
Write-Host -ForegroundColor Cyan "Installation =" $installation | select hours, minutes



#CALCULATE TOTALTIME IF POSSIBLE
if ($time1a ){
    $total = $time5a - $time1a
    Write-Host -ForegroundColor Green "Total =" $total | select hours, minutes
    }
else{
    Write-Host -ForegroundColor Green "total time can't be calculated"
    }