Simple snippet to get a list when the passwort of a service user was set the last time.
Get-ADUser -Filter 'Name -like "svc*"' -Properties * | select Name,@{name ="pwdLastSet"; expression={[datetime]::FromFileTime($_.pwdLastSet)}}
Requires the Active Directory Powershell module to run.
Command must also be run in an elevated powershell session (Run as Administrator)
Otherwise the pwdLastSet attribute will not be obtained!