It is not simple to get your users password expiration date or last changed date easily. To get the expiration date itself is very painful tasks as you can’t do it using AD Management console. You have to write bunch of powershell script to do it. However, the smartest way is to use the tools like AD Web which has built-in features to set Password Expiration Reminders as well Password Expired Notifications. You can set unlimited reminders based on your business need.