Are the years recorded in the history books a new calendar or an old calendar?

History textbooks use the Gregorian calendar.

The Gregorian calendar (aka what you call the new calendar).

Common Era (English: Common Era; Latin: Anno Domini, abbreviated or Gregorian epoch, also known as the Western calendar or Western Yuan, is a method of chronology that originated in Western society.

It begins with the year of Jesus' birth.

The date after the birth of Jesus is called Common Era (abbreviated as), and before the birth of Jesus is called before the Common Era (abbreviated as.

On September 27, 1949, after the adoption of the First Plenary Session of the Chinese People's Political Consultative Conference, the newly established People's Republic of China used the Western calendar and the Western Yuan as the calendar and year of the most countries in the international community.

When you say the old calendar, I guess I mean the lunar calendar.

In astronomy, the lunar calendar mainly refers to a calendar arranged according to the moon's lunar cycle. It is a calendar that takes the moon as one circumference of the earth (with the sun as a reference, and the actual moon orbits for more than one week) as a month, that is, the synodic month is used as the basis for determining the calendar month, and a year is a calendar of twelve calendar months.

In the process of the development and evolution of the calendar, the emergence of the 24 solar terms was used to scientifically guide agricultural production, forming the lunar calendar (Han calendar). Although, the lunar calendar and the lunar calendar are commonly known as the Yin calendar, the ancient calendar, the Han calendar, the summer calendar, and the old calendar, there is a difference between the lunar calendar and the lunar calendar (Han calendar). The traditionally used Xia calendar (Han calendar) is actually a lunisolar calendar.

Instead, the Islamic calendar (Hijri calendar) is a pure lunar calendar.

The lunar calendar is one of the traditional Chinese calendars and is also known as:"Yin Li"、"Ancient calendar", Han calendar,"Yellow calendar"、"Summer calendar"with"Old calendar"Many people always think that the lunar calendar is the lunar calendar (Han calendar), but in fact it is not, what we call the lunar calendar (Han calendar) is a combination of the lunisolar calendar and the addition of a leap month, and the lunar calendar is without a leap month.

The basis of the lunar calendar is the law of the moon's motion: the orbit of the moon, called the white way, the white path and the ecliptic are the two major circles on the celestial body, obliquely crossed by five degrees and nine minutes, the moon circles the earth once, haunts the ecliptic twice, seven hours and 43 minutes and 11 and a half seconds on the 27th day of the calendar, which is the time required for the moon to revolve around one week, which is called the "sidereal month". However, when the moon circles the earth, the position of the earth also changes due to the revolution, and the advance is more than 27 degrees, and the moon travels 13 degrees and 15 minutes every day, so the moon from the conjunction, the whole circle of the earth, and the repetition to the conjunction, it actually takes 29 days 12:44:22.8, which is called the "synodic month", and the custom of the so-called month refers to the synodic month.

The old calendar is generally indicated.

Of course, it is not the current Gregorian calendar, because the current Gregorian calendar has only been promulgated since 1582 AD, and most of ancient China predates this year. Of course, it's not all the previous calendars, because a chronology is a headache for non-history professionals.

Therefore, the years, months, and days in the current history books are actually a mixed mechanism: the year is regressed according to the current Gregorian calendar, such as 200 AD, which means the year 1,817 years before today (2017); The month and day are the same as the previous calendar, and have not been converted to the Gregorian calendar (and cannot be converted).

It is the "lunar calendar" that is now used, also known as the "lunar calendar".