Here from TechNet is a quick PowerShell script to list enabled Active Directory Accounts and their password expiration dates:
Get-ADUser -filter {Enabled -eq $True -and PasswordNeverExpires -eq $False} -Properties "DisplayName", "msDS-UserPasswordExpiryTimeComputed" | `
Select-Object -Property "Displayname",@{Name="ExpiryDate";Expression={[datetime]::FromFileTime($_."msDS-UserPasswordExpiryTimeComputed")}}