How is time typically expressed in aviation measurement?

In aviation, time is typically expressed using a four-digit sequence, usually in Zulu time, which is the same as Coordinated Universal Time (UTC). This method facilitates standardized communication across different time zones and removes ambiguity that might arise from using local times. For example, if a flight schedule indicates a departure time of 1500Z, it clearly states that the departure will occur at 15:00 hours in Zulu, which everyone across the globe can convert to their local time as needed.

This system is vital for safety and coordination, particularly in international operations where multiple time zones could lead to confusion if local times were used. By using this standardized time format, it aligns all stakeholders on the same reference point, enhancing clarity and reducing the risk of errors during flight planning and operations.