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(from ‘The Amazing Adventures of the Jewish People’
by Max I Dimont)

Jews began dating events not with a king or a divinity but with the creation of man. In Judaism mankind, not a god or an individual, is the center of destiny.

For practical purposes the Jews have adopted a common calendar with Western civilization.

The Christian designation of BC (‘Before Christ’) is replaced with BCE. (Before the Common Era) and AD (Anno Domini ‘the year of our Lord’) by CE. (Common Era).

So, for instance, instead of saying that the Modern state of Israel was founded in 1948 AD., or that David was crowned king of ancient Israel in 1000 BC, the Jews say the former was in 1948 CE and the latter in 1000 BCE.

Year 1 in Jewish chronology is the creation of Adam and Eve which, according to tradition, took place 3,760 years before the birth of Jesus - the event used by Western civilization as Year 1.

To find the Jewish date for an event occurring either before or after the birth of Jesus, just subtract or add the year in which the event took place from or to 3,760. Thus 1000 BC would be the Jewish year of 2760 (3,760 minus 1,000), and 1000 AD would be the Jewish year of 4760 (3,760 plus 1,000)

Dates given in Jewish history may vary slightly as scholars disagree on the exact dates they occurred. These variations in no way affect the validity of the event itself.

(See also Jewish holiday calendars & Hebrew date converter)

'The Jewish Book of Why', Alfred J Kolatch, pp 8-12, 1981

The Jewish calendar was put in its present form over 1,600 years ago. Until 359 C.E. the Sanhedrin functioned in Jerusalem as the supreme judicial body in Jewish life. It was the Sanhedrin, through a special Calendar Council called Sod Ha-ibur (literally, “secret of the calendar intercalation”), that decided when a leap year would occur and whether the months Cheshvan and Kislev should have twenty-nine or thirty days.

The process of intercalating (adding to the calendar extra days or months) was necessary in order to harmonize the Jewish calendar with the Civil (Gregorian) calendar. The Jewish calendar being a lunar calendar with 354 days in its year, and the Civil calendar being a solar calendar in which there were approximately 365 days, there is an eleven-day discrepancy.

The Calendar Council of the Sanhedrin, headed by its president, Patriarch Hillel II, was concerned with syn­chronizing the two calendars for the simple reason that the Jewish holidays were based on the solar cycle and had to be observed at their “appointed times” as specified in the Bible. Passover, for example, had to be celebrated in the spring. If adjustments in the calendar were not made, the biblical command to observe the holiday at that time of year would be violated, for if allowed to fall behind by eleven days each year, in a short time Passover would be observed in the winter months.

The annual eleven-day discrepancy between the Jewish mu I Civil calendar was reconciled by adding an extra month ( II) every two or three years (seven times in nineteen v<.us). In addition, each year a day was added or subtracted from the months Cheshvan and Kislev, as required. These wrre the “swing” months: in some years they would have twenty-nine days, in some years thirty days.

Exactly how the calendar calculations were arrived at was a closely-guarded secret of the Sanhedrin. This was one the ways in which the Sanhedrin managed to hold onto its power, which it did until the year 359, after which its influence waned and the Jewish community in Babylonia (where the great Babylonian Talmud was being composed) became dominant.

Up until the year 359 the arrival of the New Moon was announced by the Sanhedrin each month, based on the testimony of two eyewitnesses who appeared before the Sanhedrin and were questioned about the crescent of the New Moon that they reported having observed. If the Sanhedrin was satisfied with the integrity of the witnesses and their testimony, it then checked that testimony against its own (secret) calculations, which had been worked out in advance using mathematical and astrological knowledge. If everything harmonized, the Sanhedrin would send torch signals from mountaintop to mountaintop to notify all com­munities that the New Moon had officially been sighted. At a later date the Sanhedrin decided to relay the information by messenger rather than by signalling with torches because dissidents such as the Samaritans, who did not accept the authority of the Patriarch and his Sanhedrin, were known to send up false flares in order to confuse the message being transmitted.

When the Romans who ruled Palestine had begun to deny the Patriarch some of the freedom he and his court had enjoyed for many years, and the situation had become generally grave for the Jewish community in Palestine, Hillell II decided to publish the calendar for distribution to all communities. By this action, the official day(s) of Rosh Chodesh (beginning of the new month) and each of the Jewish holidays was fixed; the testimony of witnesses was no longer required.


• In the Civil calendar, a new day begins at midnight and extends for twenty-four hours. In the Jewish calendar, the day begins and ends at sunset. Therefore, according to the Jewish calendar a person born at nine P.M. on Thursday night, January 1,1981 is considered to have been born on Friday, January 2. His Jewish birthday is Friday, 26 Tevet 5741, which corresponds to January 2,1981. By the same token, according to the Jewish calendar, one who died on Thursday night, January 1,1981 is considered to have died on Friday, 26 Tevet 5741. In future years the Yahrzeit (anniversary of death) of that person must always be ob­served on the Jewish date: 26 Tevet.

• The following months in the Jewish calendar always have twenty-nine days: Iyyar, Tammuz, Elul, Tevet, Adar.

• The following months always have thirty days: Nissan, Sivan, Av, Tishri, Shevat.

• Cheshvan, sometimes called Mar-Cheshvan (mar means “bitter, sorrowful”) because no Jewish holidays fall in this month, and Kislev are “swing” months. They may have twenty-nine or thirty days, the number depending on what­ever adjustments are required.

• In a leap year (which occurs seven times every nine­teen years), a second Adar is added to the calendar, making a total of thirteen months in the year. In a common (nonleap) year, Adar has twenty-nine days; in a leap year, Adar I has thirty days and Adar II has twenty-nine days.

Following are the holidays of the Jewish year, broken down month by month. An asterisk after the name of the IniliiIny indicates that it is of biblical origin. The date it commences and the number of days it is to be observed are stated in the Bible.

It is important to note that whereas Israeli Jews observe nil biblical holidays for the number of days indicated in the Itlble, in the Diaspora only Reform and some Conservative congregations follow this practice. Most Conservative and all Orthodox congregations in the Diaspora observe Passover, Shavuot, and Sukkot for an extra day because of the uncertainty of the calendar in early times.


Passover,* on the fifteenth day of the month, for seven days,


Lag B’Omer, on the eighteenth day, for one day.


Shavuot,* on the sixth day, for one day.


Shiva Asar B’Tammuz, on the seventeenth day, for one day.


Tisha B’Av, on the ninth day, for one day.


No holidays.


Rosh Hashana* on the first day of the month, for one day (but the holiday is observed for two days both in the Diaspora and in Israel, as explained in the body of the book).

Fast of Gedaliah, on the third day, for one day.

Yom Kippur* on the tenth day, for one day.

Sukkot* on the fifteenth day, for seven days. Hoshana Rabba* on the twenty-first day, for one day. Shemini Atzeret* on the twenty-second day for one day.

Simchat Tora, on the twenty-third day, for one day.


No holidays.


Chanuka, on the twenty-fifth day, for eight days.


Asara BTevet, on the tenth day, for one day.


Chamisha Asar B’Shevat, on the fifteenth day, for one day


Fast of Esther* on the thirteenth day, for one day.

Purim,* on the fourteenth day, for one day.

Shushan Purim* on the fifteenth day, for one day.


The pronunciation of the Hebrew words used in this volume is that used in modem Israel. The system used to transliterate these words is the one currently used in most scholarly books. Exceptions to this rule were made when it was felt that a person unfamiliar with Hebrew might be more likely to mispronounce a word if it were presented in the established manner. Consequently, the gutteral ch, as in Chanuka or challa, is spelled with a ch, not with an h. The final h, in words like Tora and challa, has been dropped in keeping with the system established by the Jerusalem Post. Other minor deviations have also been introduced, but always for the purpose of helping the reader to come closer to the true pronunciation of the Hebrew words.


New year

A shofar made from a ram's horn is traditionally blown in observance of Rosh Hashanah, the beginning of the Jewish civic year.

The Jewish calendar has several distinct new years, used for different purposes. The use of multiple starting dates for a year is comparable to different starting dates for civil "calendar years", "tax or fiscal years", "academic years", and so on. The Mishnah (c. 200 CE) identifies four new-year dates:

The 1st of Nisan is the new year for kings and festivals;

the 1st of Elul is the new year for the cattle tithe...

the 1st of Tishri is the new year for years, of the years of release and jubilee years, for the planting and for vegetables; and

1st of Shevat is the new year for trees—so the school of Shammai; and the school of Hillel say: On the 15th thereof.

Two of these dates are especially prominent:

  1. Nisan is the ecclesiastical new year, i.e. the date from which months and festivals are counted. Thus Passover (which begins on 15 Nisan) is described in the Torah as falling "in the first month",
    while Rosh Hashana (which begins on 1 Tishrei) is described as falling "in the seventh month".
    Since Passover is required to be celebrated in the spring, it should fall around, and normally just after, the vernal (spring) equinox.
    If the twelfth full moon after the previous Passover is too early compared to the equinox, a 13th leap month is inserted near the end of the previous year before the new year is set to begin. According to normative Judaism, the verses in Exodus 12:1–2 require that the months be determined by a proper court with the necessary authority to sanctify the months. Hence the court, not the astronomy, has the final decision.
  2. Nowadays, the day most commonly referred to as the "New Year" is 1 Tishrei (Rosh Hashanah, lit. "head of the year"), even though Tishrei is the seventh month of the ecclesiastical year. 1 Tishrei is the civil new year, and the date on which the year number advances.
    Tishrei marks the end of one agricultural year and the beginning of another, and thus
    1 Tishrei is considered the new year for most agriculture-related commandments, including Shmita, Yovel, Maaser Rishon, Maaser Sheni, and Maaser Ani.

For the dates of the Jewish New Year see Jewish and Israeli holidays 2000–2050 or calculate using the section "Conversion between Jewish and civil calendars".


My Jewish Learning, Rabbi Rachel M  Solomin

The Jewish calendar not only has its own unique months, but it also numbers years differently from the secular calendar. The year 2018, for instance, was roughly equivalent to the Jewish year 5778. (Specifically, Rosh Hashanah, the Jewish New Year, in September 2018 marks the transition from 5778 to 5779.)

The counting of Jewish years, as we know it today, dates from the Middle Ages. In secular texts, Jewish time is often noted as “A.M.” — anno mundo — literally, “years of the world.” (Occasionally, “A.M.” is explained as standing for aera mundi, “era of the world.”) This system of Jewish time is called the “Mundane Era” (English for aera mundi) because those who invented it believed they were calculating dates from the birth of the world.


The basis of the Jewish annual calendar is ancient. The Torah speaks of the annual cycle of holy days and festivals, and it was systematized by the sages well before the fall of the Second Temple in 70 C.E.

If one tries to ascertain the origin of our counting of years, however, the Bible does not seem particularly helpful. When providing a history, the Bible refers to lifetimes. For example, the Torah tells us that Abraham was 75 years old when he and his household were sent from Haran to Canaan (Genesis 12:4). In the books of Samuel, Kings, and Chronicles, dates are generally given according to the years of a sovereign’s rule.

Most often, the dates are consistent among these five books. During the time when two kings ruled the divided kingdoms of Judah and Israel, the ascendance of one state’s king might be given relative to the years of the other king’s reign. For example, II Kings 14:1 reads: “In the second year of [the reign of] Yoash ben Yoahaz, King of Israel, Amatzyahu ruled [i.e. came to the throne] as King of Judah.”

During the fourth century B.C.E., a dating system was sought out for secular use on business and legal documents. At this time, the Jews borrowed the practice of the Greeks, who had introduced the practice of numbering time in “eras”–periods of time relative to a historical event, rather than the lifetime or rule of any one person. This new system is called the “Seleucid Era” by secular scholars and, in Jewish circles, it is known as “minyan shtarot”–“accounting of contracts.” It counts time from the year 312-311 B.C.E., supposedly six years following the arrival of Alexander in the Land of Israel.

For private records and Temple histories, a different era was established, one measured from the Exodus from Egypt. An example of this can be seen in I Kings 6:1, where the date for the construction of the First Temple is given as 480 of the Exodus era.


The Tannaim (sages of the late Second Temple Period and the century after the destruction) calculated the date of Creation. They did so by basing their work upon the Bible’s account of lifetimes and kingdoms, thereby determining the period of time from Creation to a known date, in this case, the destruction of the Second Temple in 70 C.E.

Many rabbis attempted this task, but the method attributed to Rabbi Yossi ben Halafta, a second century C.E. sage, is the one which gained popularity. He calculated “molad tohu”–“birth from nothing”–to be in the fourth hour of Monday, October 7, 3761 B.C.E. (according to the Gregorian calendar used in the secular world today). In Hebrew, this moment has the mnemonic acronym “BeHaRD”, which stands for:

Bet: the second day of the week, Monday (since the letter bet often represents the number two);

Hei: the fifth hour (since hei represents five);

Reish-Daled: 204 halakim (“parts,” a smaller measure of time, based on the idea that reish=200, daled=4).

The calculation of BeHaRD is discussed in a work attributed to Rabbi Yossi, Seder Olam (“Order of the World”), which is also sometimes called Seder Olam Rabbah in order to distinguish it from a work of similar name (the later Gaonic work, Seder Olam Zuta).

Innumerable scholars, both Jewish and Christian, have attempted to calculate the date of Creation. Even if they used the same basis (Tanakh, the Hebrew Bible) for their systems of accounting, there is a broad range among their estimates. The historian des Vignoles stated in the introduction to his treatise on chronology that he had found well over 200 different calculations of the time from the birth of the world to the fall of the Second Temple, and that they varied by as much as 3,500 years. Well into the rule of Queen Victoria of England the most commonly given date for Creation was the year 4004 B.C.E., calculated by Bishop Usher, who published this date in 1654.

To this day, those Jews who believe the biblical accounting of time to be literal still accept Rabbi Yossi’s calculation, dating Creation to the year 3761 B.C.E. Others claim that the date is figurative, symbolic, or holds esoteric meaning. In calculating BeHaRD, Rabbi Yossi tried to justify disparate accountings from the following sources: the chronologies of Samuel, Kings, and Chronicles; those of the Second Temple kingdoms, in rabbinic histories passed down to the Talmud and found in the Babylonian Talmud, Avodah Zarah 9a and 10a; and the prophecies of Jeremiah and Daniel.

Some academics compare the Genesis accounting of dates with those of the Greeks, Chaldeans (including the Babylonians), Egyptians, and Hindus. The Chaldeans, Egyptians, and Hindus used enormous figures, into the millions of years, to explain the timeframe of Creation. The ancient Hebrews and Greeks seemed unwilling to deal in such large numbers. Both peoples ascribed Creation to a date closer to their own times. This may indicate either a political agenda (consciously or subconsciously communicating a cultural chauvinism) or may simply be a simplification for the purpose of clarity.

It is possible that there is a direct correlation between the seven days of Creation mentioned in Genesis and a specific Babylonian system, which would suggest that each Genesis “day” represents a specific number of solar years.



The Seleucid and Mundane Eras coexisted for numerous centuries. Most often, Rav Sherira Gaon — the last Gaon, the head of the academies in Babylonia in the centuries following the editing of the Talmud — is given the credit for suggesting the use of BeHaRD as the basis for a chronological system, in the 10th century C.E.

Maimonides (1135-1204 C.E.) at times used multiple eras, giving a date first according to the years following the destruction of the Second Temple, then according to the Seleucid Era, and finally according to the Mundane Era. This suggests that no single system had achieved universal acceptance by the 13th century.

The Seleucid Era continued to be used in parts of the Arab world until quite late. Among Egyptian Jewry, it was the dominant system used until Rabbi David ibn Abi Zimra discontinued its use in the 16th century C.E.; in parts of the Arabian Peninsula, it was used alongside the Mundane Era as late as the 19th century.

How the Hebrew calendar works.
My Jewish Learning

The rhythm of Jewish time is determined both by the sun and by the moon. The basic unit of time is naturally enough the day, which is a unit of time determined by the amount of sunlight reaching the earth as it rotates on its axis. In the Western world a day begins in the middle of the night and lasts until the next midnight. Since the standardization of time, days are divided into regular segments of 24 hours.

Looking for a Jewish calendar? Click here to create a free, customized, printable Jewish calendar. You can also download free digital Jewish calendar apps for your mobile device at Apple’s App Store or Google Play. Or purchase a printed calendar here.

The Jewish day is also ruled by the sun. However, it is more firmly rooted in simply observable phenomena than our standard day. If we didn’t have clocks and watches, we would never be able to determine at what moment one day ends and the next one begins. Following Genesis 1, in which the refrain “it was evening and it was morning” sums up each day’s creative work, Judaism measures its day from one evening to the next. Of course, the question arises how to define the exact moment when one day ends and the next begins.


The rabbis determined that the new day begins at the moment when the sun sinks below the horizon. Unlike our secular day, in which the daylight hours are framed by night, the Jewish day begins with night and ends with day.

This is the reason why all Jewish holidays begin in the evening before the first day of the observance. In fact, according to a Jewish reckoning of time, the evening before the day is indeed the beginning of the new calendar day.


The first story of creation in Genesis 1:1-2:4 also establishes the next higher unit of measuring time, namely the seven-day week. This tale serves to place the week firmly within the divine plan, in which a six-day workweek is followed by the sacred Sabbath, a divinely ordained day of rest. Since most units of measurement ultimately go back to the Babylonians, who were the first great astronomers and natural observers of the ancient world, we know that the week is meant to be coordinated with the four phases of the moon.

Therefore, roughly speaking, four weeks make a month. And roughly 12 months make a year. Since, however, the 12-month lunar year and the 365-day solar calendar do not overlap exactly, the Gregorian calendar that has become the standard world calendar has months of unequal length that no longer correlate with the phases of the moon and has to insert an extra day every four years (the leap year) in order to have the calendar reflect the solar year.


This becomes somewhat more complicated in the case of the Jewish calendar, for it is still coordinated with the phases of the moon. Indeed, it is that which determines the times of the Jewish holidays. This is of particular importance with those that fall on the new moon and those that are celebrated at the time of the full moon. In addition, since the 12-month lunar year is a few days shorter than a solar year, strict adherence to a lunar calendar would mean that the holidays would eventually take place at the wrong season.

This would mean that every now and then we would celebrate Hanukkah, the mid-winter festival of lights, in the middle of summer and Sukkot, the autumn harvest festival, in the early spring. Therefore, in an attempt to coordinate the traditional lunar year with the solar year Judaism has worked out a system of 19-year cycles, in which there are seven leap years. In distinction to the day added to the secular leap year, the Jewish calendar adds a full month to the end of its year. In this manner the Jewish holidays fluctuate by about a month or so in relationship to the Gregorian calendar, but always fall at the same time of year. It is interesting to note that Islam also follows a lunar calendar. In contrast to Judaism, however, the Islamic calendar is strictly a lunar one and is not coordinated with the solar year. Thus, over the course of time, holidays such as Ramadan, occur at different seasons.


Ji Calendar is a state-of-the-art, educationally rich, imaginative and enriching series of modules to teach everything that a child needs to know about the Jewish calendar. The app is divided into a classroom tool and an addictive game for students. Students can design their own ‘space kid’ who will accompany them on their entire journey through the Jewish Calendar.

Accuracy of the Hebrew calendar   Computers & Mathematics with Applications,  
Volume 39, Issue 11, June 2000, Pages 23-24

Calendars  Explanatory Supplement to the Astronomical Almanac,, L. E. Doggett

About Time:  How Early Modern Jewish Calendars Changed Jewish Conceptions of Time,
Tablet,  Anthony Grafton, April 14, 2011
A vivid new scholarly book illuminates how the calendars of early modern Europe—playful, alive, and beautifully designed—reflected and transformed Jewish conceptions of time

Calendar, Jewish,  Livius

Hebrew Calendars

Dead Sea Scroll tract was precursor to Jewish calendar, Manchester University, 29 July 2011

An obscure Babylonian document from the world famous Dead Sea Scroll collection was almost certainly a precursor to the Jewish calendar according to University of Manchester research.

Astronomical Aspects of the Jewish Calendar, I Weinberg, SAO/NASA Astrophysics
Data System (ADS)

The Jewish Calendar  The Elected Representative Body of NSW Jewry


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