A simple one, enter the following into PowerShell running as a domain admin to export a list of domain users with the date they last set a password and if their password is set to expire.
Get-ADUser -filter * -properties passwordlastset, passwordneverexpires | sort-object name | select-object Name, passwordlastset, passwordneverexpires | Export-csv -path c:\PassLastSet.csv
You can of course also use CMD. Which is much simpler and easy to remember.
Net User Username
