Summary: Use Windows PowerShell to work with Active Directory date fields.

 How can I Use Windows PowerShell to work with date fields in Active Directory?

 Try the following techniques:

# Password last set within the last 30 days?

$pwdLastSet = Get-ADUser Administrator -Properties pwdLastSet |

     Select-Object -ExpandProperty pwdLastSet

# Option A

$pwdLastSet -gt (Get-Date).AddDays(-30).ToFileTimeUTC()

# Option B

[datetime]::fromFileTimeUTC($pwdLastSet) -gt (Get-Date).AddDays(-30)