CTA Time Systems


How does the CTA standardize the keeping of time? Find out in this article.

Timekeeping To-do / Questions




1. General Measures of Time


Seconds/minutes/hours: The same

One day: 24 hours (the same)

Cycle year: 360 standard days with 12 “months” of 30 days, which is easy to plan around. The “months” are numbered and not named. They start counting from 0 CY, when the CTA was officially formed.

Universal Time Code (UTC): A single running clock that all people within the jurisdiction of the CTA use as standard time. Local administrators decide when lights dim, when markets open, etc., but the time code doesn’t change. This is synchronized with the hours in a day.

2. History