There seems to be a misunderstanding in your statement. The age of the universe, according to current scientific estimates, is around 13.8 billion years, not 14 trillion years. This age is determined through various scientific methods, such as measuring the cosmic microwave background radiation, the expansion of the universe, and the ages of the oldest observed astronomical objects.
The Byzantine calendar, on the other hand, is a traditional calendar system that originated in the Byzantine Empire and is based on the estimated date of creation as calculated by the 6th-century Christian scholar, Dionysius Exiguus. According to this calendar, the year 7531 corresponds to the year 2023 in the Gregorian calendar commonly used today.
It's important to understand that religious or cultural calendars, including the Byzantine calendar, are based on their own historical, religious, or traditional considerations and are not directly linked to scientific estimations of the age of the universe.
The scientific understanding of the universe's age and the calendar systems used by various cultures or religions serve different purposes and should not be confused with each other.