Does UTC Time change with the seasons? Coordinated Universal Time (universally known as UTC) is the standard time that is accepted around the world. UTC does not change with the change of seasons, even though citizens in the United States and other countries do use Daylight Saving Time (summer time). UTC remains a constant.

UTC became official in 1963 and is widely used in many applications. In aviation, pilots use UTC to avoid the obvious confusion because of time variations around the globe. Computer clocks and Internet usage employs UTC. Amateur radio operators log their radio contacts in UTC, because a conversation (QSO) can be exchanged between different time zones. This solves the problem for both operators. UTC or Zulu Time is used in weather forecasts and astronomical events.

Prior to 1972, this time was called Greenwich Mean Time (GMT) but is now referred to as Coordinated Universal Time or Universal Time Coordinated (UTC). It is a coordinated time scale, maintained by the Bureau International des Poids et Mesures (BIPM). It is also known a “Z time” or “Zulu Time” [NOAA].

Abbreviation Explained
English CUT Coordinated Universal Time
French TUC Temps Universel Coordonné
UTC unofficial English: “Universal Time Coordinated”; unofficial French: “Universel Temps Coordonné” [Wikipedia].