Aviators speak their own dialect of English.
When learning to fly you learn a variety of new concepts and terms.
One of them is Zulu time.
This is not what they mean by Zulu time:
Ok, it's not what they mean by Zulu time for aviation purposes anyways.
Zulu time is based on Greenwich Mean Time and uses a 24-hour system of time notation. "1:00 a.m." is expressed as 0100, pronounced "zero one hundred", alternatively pronounced as "Oh my god it's early". The time one minute after 0159 is 0200. The time one minute after 1259 is 1300 (pronounced "thirteen hundred"). This continues until 2359. One minute later is 0000 ("zero hundred"), and the start of a new day.
Zulu time is now also commonly called Universal Time Co-ordinated or UTC in order to prevent the deployment of Martini-Henrys during flight planning operations.