If a license expires on December 31st, when would it generally be valid until?

When a license states that it expires on December 31st, it is typically valid until the last moment of that day, which is just before midnight. This convention underscores the idea that the license remains active throughout the entire day on which it is set to expire, allowing for full utilization of its benefits and responsibilities up until that point. Therefore, as the clock strikes midnight, the license becomes invalid, marking the end of its validity. This understanding is essential for professionals to ensure they maintain compliance with licensing regulations and renew their licenses in a timely manner to avoid lapses.