The Hebrew date today is 15 Av 5786, also known as Tu B'Av. This date marks a unique intersection of ancient history, spiritual tradition, and modern cultural celebration. In the Jewish calendar, the 15th day of the month of Av is considered one of the happiest days of the year, rivaled only by Yom Kippur in its communal significance. As the year 5786 progresses, this specific day offers an opportunity to look deeply into the sophisticated mechanics of the Hebrew calendar, the historical weight of the month of Av, and the festive nature of a day dedicated to reconciliation and love.

Immediate Answer for the Hebrew Date Today

For those seeking the current standing of the Jewish calendar, today is the 15th of Av, in the year 5786 Anno Mundi. In Hebrew characters, this is written as ט״ו בְּאָב תשפ״ו.

This date falls within the summer season of the Northern Hemisphere and occurs during a significant leap year in the 19-year Metonic cycle. Because the Hebrew day begins at sunset, the observances for 15 Av technically start on the evening of the preceding Gregorian day and continue until the following sundown. On this day, the usual prayers of confession, known as Tachnun, are omitted from the daily synagogue services to reflect the festive and joyous status of the date.

The Significance of Tu B'Av on 15 Av 5786

Tu B'Av is often referred to as the Jewish festival of love, but its roots go much deeper than modern romantic celebrations. The name "Tu" is derived from the Hebrew letters Tet (9) and Vav (6), which together sum to 15. Historically, the Mishnah records that there were no holidays as great as Tu B'Av and Yom Kippur.

Historical Origins and the End of the Desert Decree

The primary reason for the joy on 15 Av stems from the period of the Exodus. According to tradition, during the forty years the Israelites spent in the desert, a decree was in place that the generation who left Egypt would perish before entering the Promised Land. Each year on Tisha B'Av (the 9th of Av), more members of that generation passed away. However, in the fortieth year, no one died on the 9th of Av. The people waited until the 15th of the month to be certain that the decree had finally ended. When the full moon appeared on 15 Av and no more deaths occurred, they realized the period of wandering and punishment was over. This transformation from a time of mourning to a time of celebration remains the core spiritual theme of today.

The Traditional Celebration of Matchmaking and Love

In ancient times, Tu B'Av served as a day of communal unity and matchmaking. The daughters of Jerusalem would go out into the vineyards dressed in simple white garments. The use of white, borrowed clothing was intentional; it ensured that no one could distinguish between the wealthy and the poor, creating a level playing field where character and soul were valued over material status.

Young men would go to these vineyards to find their future brides. This tradition emphasized the breaking down of tribal barriers, as 15 Av was also the date when the different tribes of Israel were permitted to intermarry, fostering a sense of national cohesion. In modern Israel, Tu B'Av has seen a massive resurgence as a day for weddings, concerts, and expressions of love, mirroring the joy of the ancient vineyard dances.

Understanding the Hebrew Year 5786 and Anno Mundi

The year 5786 is calculated according to the Anno Mundi (AM) system, which translates from Latin as "in the year of the world." This count is based on rabbinic calculations derived from the Masoretic text of the Hebrew Bible, tracking time back to the traditional date of the creation of the world.

The epoch of the Hebrew calendar corresponds to sunset on October 6, 3761 BCE in the proleptic Julian calendar. Therefore, to find the Hebrew year, one generally adds 3760 to the Gregorian year before Rosh Hashanah, or 3761 after. The year 5786 began at sunset on September 22, 2025, and will conclude in September 2026.

It is important to note that the year number increments on Rosh Hashanah, which falls on the 1st of Tishrei. Although Nisan is considered the first month in the religious order (marking the Exodus), Tishrei is the start of the civil year and the point at which the year count increases.

The Mechanics of the Luni-Solar System

The Hebrew calendar is a masterpiece of ancient mathematics and astronomy, functioning as a luni-solar system. This means it attempts to harmonize the lunar month with the solar year, a task that is inherently difficult because the two cycles do not naturally align.

How the 19-Year Metonic Cycle Functions

A purely lunar year, consisting of 12 lunar months, lasts approximately 354 days. This is roughly 11 days shorter than the solar year of 365 days. If the Hebrew calendar were purely lunar—like the Islamic calendar—holidays like Passover (which must fall in the spring) would migrate through all four seasons over time.

To prevent this, the Hebrew calendar employs the Metonic cycle, named after the Greek astronomer Meton but used by Jewish calendar-makers for millennia. This cycle consists of 19 years, during which seven leap months are added. These leap years occur in the 3rd, 6th, 8th, 11th, 14th, 17th, and 19th years of the cycle. By adding an extra month seven times every 19 years, the lunar months are pulled back into alignment with the solar seasons.

Why 5786 is a Leap Year with 13 Months

The current year, 5786, is the 19th year of the current Metonic cycle. As the final year of the cycle, it is designated as a leap year. In a standard year, there is one month of Adar. However, in a leap year like 5786, an extra month is inserted. This results in two months: Adar I (Adar Rishon) and Adar II (Adar Sheni).

Adar I is the intercalary month, while Adar II is considered the "real" Adar for the purposes of celebrating Purim. This insertion ensures that the following month, Nisan, always occurs during the spring (Aviv), fulfilling the biblical commandment to "observe the month of the spring."

Defining the Jewish Day from Sunset to Sunset

One of the most distinctive features of the Hebrew date today, 15 Av 5786, is how the day itself is defined. Unlike the Gregorian calendar, where the day changes at midnight, the Hebrew day begins and ends at dusk.

This concept is rooted in the creation narrative in Genesis, which states, "And there was evening and there was morning, one day." Consequently, the festivities of Tu B'Av actually begin when the sun goes down on the 14th of Av. This is why Jewish holidays and the Sabbath (Shabbat) always begin in the evening. For anyone tracking the Hebrew date, it is vital to remember that after sunset, you are technically living in the "next" day according to the Hebrew reckoning.

The Weekly Torah Portion for this Date

For the week containing 15 Av 5786, the Jewish community focuses on a specific section of the Five Books of Moses known as Parashat Eikev. This portion is found in the Book of Deuteronomy (Devarim 7:12–11:25).

Parashat Eikev continues Moses’ final address to the Israelites. It emphasizes the rewards for following the divine commandments and contains the famous passage regarding the "Seven Species" of the Land of Israel: wheat, barley, grapes, figs, pomegranates, olives, and honey. The themes of Eikev—gratitude, the connection to the land, and the warning against pride—complement the joyous and reflective nature of Tu B'Av. Reading this portion during the week of the 15th of Av serves as a spiritual reminder that the joys of life and the fruits of the land are tied to a deeper moral and spiritual commitment.

Major Holidays and Observances Throughout the Year 5786

The year 5786 is a "full" year in more ways than one. Being a leap year, the holiday cycle is slightly elongated. Here are the key dates that define this year:

  • Rosh Hashanah (The New Year): 1–2 Tishrei (Started Sept 22, 2025). This marked the beginning of 5786.
  • Yom Kippur (Day of Atonement): 10 Tishrei. The most solemn day of the year, focused on repentance.
  • Sukkot (Feast of Tabernacles): 15–21 Tishrei. A week-long celebration of the harvest and divine protection.
  • Hanukkah (Festival of Lights): 25 Kislev – 2 Tevet. Commemorating the rededication of the Second Temple.
  • Tu Bishvat (New Year for Trees): 15 Shevat. A day for ecological awareness and planting.
  • Purim: 14 Adar II. Celebrating the deliverance of the Jews in the Persian Empire. Note that in 5786, Purim is in Adar II because it is a leap year.
  • Passover (Pesach): 15–22 Nisan. Marking the Exodus from Egypt.
  • Shavuot (Feast of Weeks): 6–7 Sivan. Celebrating the giving of the Torah at Mount Sinai.
  • Tisha B'Av (9th of Av): A day of mourning for the destruction of the Temples, which occurred exactly six days before today's joyous 15 Av celebration.

The Scholarly Debate Surrounding the Hebrew Chronology

While the year 5786 is the standard used for religious and civil purposes in Israel and Jewish communities worldwide, there is a fascinating chronological debate regarding the "Missing Years."

Traditional Jewish chronology, as codified in the Seder Olam Rabbah (c. 160 CE), attributes about 52 years to the Persian period (from the fall of Babylon to the conquest by Alexander the Great). However, modern historians and archaeologists, based on Persian and Greek records, suggest this period actually lasted over 200 years. This creates a discrepancy of approximately 164 years.

If one were to follow the academic timeline, the year since creation would be closer to 5950. However, for the purposes of the Hebrew calendar and its intricate leap-year math, the 5786 count remains the absolute standard. This discrepancy does not affect the observation of holidays or the weekly Torah portions, but it serves as a point of interest for those studying the intersection of biblical tradition and secular history.

Summary

Today, 15 Av 5786, is a day of profound transition and celebration. It marks Tu B'Av, the "Jewish Valentine's Day," which commemorates the end of ancient hardships and the beginning of a season of love and unity. As part of the year 5786—a leap year in the 19-year Metonic cycle—this date is governed by a complex luni-solar system that ensures Jewish traditions remain anchored to their proper seasons. From the omitting of Tachnun in prayers to the reading of Parashat Eikev, the day is filled with specific rituals that highlight its status as one of the most joyous moments in the Hebrew calendar.

FAQ

What does 15 Av 5786 mean? It refers to the 15th day of the month of Av in the Hebrew year 5786. This year is calculated from the traditional date of the world's creation (Anno Mundi).

Why is Tu B'Av celebrated today? Tu B'Av is the 15th of Av. It is celebrated to mark several happy historical events, most notably the end of the deaths of the generation of the Exodus in the desert and the removal of barriers for inter-tribal marriage.

Is 5786 a leap year in the Hebrew calendar? Yes, 5786 is the 19th year of the 19-year Metonic cycle, which is always a leap year. It contains an extra month, Adar I, to keep the lunar calendar aligned with the solar seasons.

When does the Hebrew date change? The Hebrew date changes at sunset, not at midnight. Therefore, 15 Av begins at dusk on the previous day and ends at dusk today.

What is the special prayer practice for 15 Av? Because it is a festive day, the Tachnun (prayer of confession and petition) is omitted from the morning and afternoon services.

How is the year 5786 written in Hebrew? It is written as תשפ״ו. In the Hebrew alphanumeric system, Tav (400), Shin (300), Peh (80), and Vav (6) sum to 786, representing the year within the current millennium.

What is the Torah portion for this week? The weekly Torah portion is Parashat Eikev, which focuses on the rewards of following commandments and the beauty of the Land of Israel.