1 AM is referred to as 0100. Coordinated Universal Time follows a similar format, but the start time of each day depends on a person's location on the globe. UTC, typically referred to as Greenwich Mean Time, or ZULU time, has as its origin Greenwich, England. When it is midnight in Greenwich, we consider that to be the beginning of a new day worldwide. Imagine communicating with an amateur radio operator on the other side of the Earth.
Most hams maintain a log book which includes information about frequency used, time, and remarks.
Matters are greatly simplified when all operators include a time entry which is the same worldwide. Convert local time to UTC time 1. Use the charts to determine the local and UTC times. Minutes are read as they normally are. Ask your students to convert their current bell schedule using UTC time.