What time is it right now? Look at your watch or your phone. Your answer will likely differ from mine and others, even if we are all checking at the same moment in time. Think about the strike of midnight on New Years Eve, marking the turn of the new year.
Everyone in the world doesn't celebrate the ball drop at the same moment in time. The Earth spins, and thus we have time zones. Even beyond time zones, you have standard time and daylight savings time, and then some areas that don't recognize daylight savings time. 'Its five o'clock somewhere,' right? To get us all on the same page, there is a time that is used in aviation and meteorology that provides stability for various time zones. That time is Zulu time, and right now is a good time for us to dig a little more into it.