Earth Time
From helios Wiki
Standard Earth Time
Standard Earth Time or SET is the common time measurement used in under Federal Sovereignty. While hours, days, months and years can vary in length between planetary objects, not so is the SET, which stays constant, consistent and familiar to all.
Basis
SET is derived of Central European Time or CET. It is the Earth timezone in Switzerland, home of the Federal Government in Geneva.
Unison of Time Format
All time formats used under Federal Law are derived of SET or are based on it. It is the only time format used by the Armed Forces of the Sol Fedeeration.