Powershell - Export users not logged in for 90 days but include the exact number of days in the csv file

Hi Guys,

I have compiled the following script to export all users that has not logged on for 90 days and does not have specific description values. The script works fine and exports all the data currently in the script.

THE SCRIPT

$CURRENTDATE=GET-DATE 
$NumberDays=90
$OU='domain.com/'
$OutputfilePath = "c:\90daysincelogon_"+([datetime]::Now).tostring("yyyy-MMM-dd")+".csv"

GET-QADUSER -SizeLimit 0 -SearchRoot $OU | Where-Object { $_.description -notlike "System Account*" -and $_.description -notlike "Vendor*" -and $_.LastLogon.AddDays($NumberDays) -lt $CURRENTDATE } | select name, LogonName, mail, description, LastLogon, LastLogonTimestamp, AccountIsDisabled, ParentContainerDN, PasswordStatus | export-csv $outputfilePath

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Desired output and question
1. Why does the LastLogon and LastLogonTimestamp never mach?
2. I need a field next to LastLogon with the exact number of days since last logon for example 93 and the same for LastLogonTimestamp.

Thanks in advance