Why doesn't Eusebius of Caesarea mention Julian calendar in his Chronicle?

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Julius Caesar established the Julian calendar as the official calendar of the Roman government, army, and religion and the civil calendar to be used by Roman citizens. Many cities and provinces in the Roman Empire also came to use the Julian calendar.

There is a difference between a calendar and a calendar era. A calendar era is a moment in time that later years are counted from. It is possible for different calendars to use the same calendar era, and for people who use the same calendar to use different calendar eras.

Various parts of the Roman Empire used different calendar eras. The Romans themselves mostly didn't bother with numbering years, but mostly named each year after the two consuls for the year. So they would refer to a year as the year of the consulship of X and Y, naming the two consuls.

A less often used method was to use the foundation of Rome as the calendar era. Roman historians suggested several dates for the legendary foundation of Roman, and the year we call 753 BC eventually became the official date for the founding of Rome.

Greeks often used the four year long Olympiads for date events, which would be dated to the ____th year of the ____ Olympiad. The first Olympiad began in 772 BC.

It was also common to date events by the regnal year of the current emperor.

And many different localities in the Roman Empire used different local calendar eras to date events, while using the Julian calendar or a local calendar.

If Eusebius of Caesarea dated events only to the year, and not to the precise date, he would have no need to compare and mention different calendars, since most dates he worked with would have been given in calendars that used years of approximately the same length.

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