Overview
Zulu time is an aviation term that means a given time adjusted to Coordinated Universal Time (UTC). This is also the same as Greenwich Mean Time (GMT). Zulu times are useful for aviation due to the fact that many flights cross times zones. In addition, many aviation weather products cover areas larger than one time zone. Using "Z" time allows a pilot anywhere in the world to quickly determine the validity of a given weather product with respect to their flight.