Final answer:
The month an officer is notified about a warrant expiration is not provided in the question and can vary based on jurisdictional policies. Law enforcement agencies typically have internal systems to track and notify officers of impending warrant expirations ahead of time.
Step-by-step explanation:
The question regarding warrant expiration notification does not provide enough context or jurisdiction to give a specific month when an officer is notified. Warrant expiration could be tied to different laws or regulations depending on the country or state. Generally, law enforcement agencies have systems in place for tracking warrant validity and expiration. An officer may be notified via internal systems, typically well before the expiration date, to allow for actions to be taken such as requesting an extension or conducting necessary enforcement actions before the warrant expires.