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The Bengali calendar, known as the "Bangla Panjika" or "Bangabda," is the traditional calendar of the Bengali-speaking people of West Bengal, Bangladesh, Tripura, and the global Bengali diaspora. Revised in 1966 by a committee led by Dr. Meghnad Saha (the astrophysicist who formulated the Saha ionization equation), the modern Bengali calendar is a reformed solar calendar that maintains close alignment with the Gregorian system while preserving its ancient roots. The Panjika serves as the authoritative reference for all religious observances, festivals, and auspicious timings in Bengali Hindu culture. Over 250 million people follow the Bengali calendar today.
After the Saha calendar reform, the first five months (Boishakh to Bhadro) have 31 days each, and the remaining seven months (Ashwin to Choitro) have 30 days each, totalling 365 days (366 in leap years, when Choitro gets an extra day). This reform eliminated the variable-length months of the older sidereal system, making date calculations predictable while preserving the traditional month names that derive from the same Nakshatras as the pan-Indian Hindu calendar.
| # | Month | Bangla | Gregorian | Days |
|---|---|---|---|---|
| 1 | Boishakh | বৈশাখ | Apr 14 – May 14 | 31 |
| 2 | Joishto | জ্যৈষ্ঠ | May 15 – Jun 14 | 31 |
| 3 | Asharh | আষাঢ় | Jun 15 – Jul 15 | 31 |
| 4 | Shrabon | শ্রাবণ | Jul 16 – Aug 15 | 31 |
| 5 | Bhadro | ভাদ্র | Aug 16 – Sep 15 | 31 |
| 6 | Ashwin | আশ্বিন | Sep 16 – Oct 15 | 30 |
| 7 | Kartik | কার্তিক | Oct 16 – Nov 14 | 30 |
| 8 | Ogrohayon | অগ্রহায়ণ | Nov 15 – Dec 14 | 30 |
| 9 | Poush | পৌষ | Dec 15 – Jan 13 | 30 |
| 10 | Magh | মাঘ | Jan 14 – Feb 12 | 30 |
| 11 | Falgun | ফাল্গুন | Feb 13 – Mar 14 | 30 |
| 12 | Choitro | চৈত্র | Mar 15 – Apr 13 | 30 |
Poila Boishakh (Bengali New Year – Halkhata, Mangal Shobhajatra, cultural programs), Rabindra Jayanti (Tagore's birth anniversary, celebrated on 25 Boishakh)
Jamai Shashti (son-in-law's day – mothers-in-law honor their daughters' husbands with feasts), Phalaharini Kali Puja
Rath Yatra (Jagannath's chariot procession – massive celebrations in Kolkata, Mahesh, and Serampore), Ulto Rath (return journey)
Jhulana Yatra (swing festival of Radha-Krishna), Nag Panchami, Raksha Bandhan, Manasa Puja (snake goddess)
Janmashtami (Krishna's birthday), Vishwakarma Puja (artisans' day – factories and workshops worship tools), Ganesh Chaturthi
Mahalaya (dawn recitation of Mahishasura Mardini – all Bengal listens), Durga Puja (Shashti to Dashami – Bengal's greatest festival, 10 days of Goddess worship, pandal-hopping, Sindoor Khela, and Bisarjan), Lakshmi Puja (Sharad Purnima)
Kali Puja / Diwali (Amavasya of Kartik – Bengal's unique Kali worship alongside the pan-Indian Diwali), Bhai Phonta (sisters bless brothers – Bengali equivalent of Bhai Dooj), Jagaddhatri Puja (especially in Chandernagore)
Nabanna (new rice festival – celebrating the harvest with freshly harvested rice dishes), Jagaddhatri Puja immersion
Poush Sankranti / Makar Sankranti (winter harvest – Poush Mela at Shantiniketan, pithe-puli sweets), Poush Parbon (traditional Bengali sweets festival)
Saraswati Puja (Vasant Panchami – students worship Goddess of learning, dress in yellow, place books at her feet), Maghi Purnima
Dol Yatra / Holi (festival of colors – Dol Purnima when Radha-Krishna idols are placed on swings), Maha Shivaratri
Chaitra Sankranti (last day of Bengali year – Charak Puja with hook-swinging rituals), Basanti Puja (spring Durga Puja – the original timing of Durga worship before Rama's "Akal Bodhan")
Poila Boishakh (1st Boishakh, April 14-15) is the Bengali New Year and one of the most joyous celebrations in Bengali culture. In West Bengal, the day begins with "Mangal Shobhajatra" (processions) and "Prabhat Pheri" (morning rounds with devotional songs). Shopkeepers perform "Halkhata" – the ceremonial opening of new account books, inviting customers for sweets and refreshments to begin the business year on an auspicious note. Homes are cleaned and decorated with alpona (floor art), and families wear new clothes. The traditional meal includes "Ilish Maach" (Hilsa fish) and "Panta Bhat" (fermented rice). In Shantiniketan, Rabindranath Tagore's university, Poila Boishakh is celebrated with special cultural programs. In Bangladesh, the celebration is even grander – Dhaka University's Charukala (Fine Arts) faculty organizes the famous "Mangal Shobhajatra" procession featuring colorful floats and masks, recognized by UNESCO as an Intangible Cultural Heritage of Humanity since 2016.
Durga Puja is not merely a festival in Bengal – it is the defining cultural event of the year, a 10-day celebration that transforms cities, towns, and villages into open-air art galleries and communal gathering spaces. The observances begin with Mahalaya (the Amavasya of Ashwin), when Bengalis wake before dawn to listen to Birendra Krishna Bhadra's legendary All India Radio recitation of "Mahishasura Mardini" – a tradition since 1931 that remains unchanged. Mahalaya marks the end of Pitru Paksha and the invocation of Goddess Durga to descend to Earth. The main puja spans Shashti through Dashami: Shashti (day 6) features the "Bodhon" or awakening of the deity; Saptami (day 7) begins with "Nabapatrika" (nine plants representing nine forms of Durga) being bathed in the Ganges; Ashtami (day 8) is the most sacred day with "Kumari Puja" (worshipping a young girl as the living Goddess) and "Sandhi Puja" at the junction of Ashtami and Navami (the precise 48-minute window when Durga slew the demons Chanda and Munda); Navami (day 9) continues with elaborate rituals; and Dashami (day 10) concludes with "Sindoor Khela" (married women apply vermillion to the Goddess and each other) and the emotional "Bisarjan" (immersion of the idol in water), accompanied by the cry "Asche bochor abar hobe!" (It will happen again next year!). Thousands of themed pandals (temporary structures) across Kolkata compete for artistic excellence, some replicating famous buildings, others showcasing social commentary through innovative installations.
The Bengali Panjika is distinguished from other Indian calendar systems in several important ways. First, the Bengali calendar year (Bangabda) begins on Poila Boishakh (1st Boishakh), which falls on April 14th or 15th – the same as the Tamil and Malayalam New Year, reflecting their shared solar basis. This contrasts with the North Indian New Year (Chaitra Shukla Pratipada) which falls on a different date each year because it follows the lunar cycle. Second, the Saha reform of 1966 made the Bengali calendar the most scientifically rationalized Hindu calendar: fixed month lengths, synchronized leap years with the Gregorian calendar, and elimination of accumulated errors from the sidereal system. Third, the Panjika traditionally published by houses like Gupta Press (est. 1875) and the Bishudha Siddhanta Panjika is far more than a calendar – it contains daily Tithi, Nakshatra, Yoga, Karana, planetary positions, muhurtas for every day, eclipse data, marriage dates, agricultural advice, and even weather predictions based on traditional almanac science. Many Bengali families consider the annual Panjika purchase an essential household tradition. Fourth, the Bengali system maintains a unique tradition of "Lagna calculation" for Durga Puja – the exact starting time of Puja is calculated astronomically based on the rising point of the Zodiac, and different Panjikas may prescribe slightly different timings based on their computational methods.
Exact dates for all major Bengali festivals in 2026 with tithi (lunar day) and nakshatra (lunar mansion) computed for Kolkata. Plan your puja schedules with these verified dates from the Bengali Panjika.
| Festival | Date | Tithi | Nakshatra |
|---|---|---|---|
| Makar Sankranti (Poush Sankranti) | Wed, 14 Jan 2026 | Paush Krishna Pratipada | Uttara Ashadha |
| Saraswati Puja (Vasant Panchami) | Mon, 23 Feb 2026 | Magha Shukla Panchami | Shravana |
| Poila Boishakh (Bengali New Year) | Tue, 14 Apr 2026 | Chaitra Krishna Amavasya | Revati |
| Rath Yatra | Mon, 29 Jun 2026 | Ashadha Shukla Dwitiya | Pushya |
| Janmashtami | Sat, 15 Aug 2026 | Shravana Krishna Ashtami | Rohini |
| Durga Puja (Shashti) | Tue, 13 Oct 2026 | Ashwin Shukla Shashthi | Uttara Phalguni |
| Durga Puja (Saptami) | Wed, 14 Oct 2026 | Ashwin Shukla Saptami | Hasta |
| Durga Puja (Ashtami) | Thu, 15 Oct 2026 | Ashwin Shukla Ashtami | Chitra |
| Durga Puja (Navami) | Fri, 16 Oct 2026 | Ashwin Shukla Navami | Swati |
| Vijaya Dashami (Bisarjan) | Sat, 17 Oct 2026 | Ashwin Shukla Dashami | Vishakha |
| Lakshmi Puja | Sat, 24 Oct 2026 | Ashwin Purnima | Ashwini |
| Kali Puja / Diwali | Sun, 8 Nov 2026 | Kartik Krishna Amavasya | Swati |
| Chhath Puja | Wed, 11 Nov 2026 | Kartik Shukla Shashthi | Mula |
Major Bengali festival dates for 2027. Bangabda 1434 begins on 14 April 2027. All dates computed for Kolkata with tithi and nakshatra from the Bengali Panjika.
| Festival | Date | Tithi | Nakshatra |
|---|---|---|---|
| Makar Sankranti (Poush Sankranti) | Thu, 14 Jan 2027 | Paush Shukla Dashami | Shravana |
| Saraswati Puja (Vasant Panchami) | Thu, 11 Feb 2027 | Magha Shukla Panchami | Shravana |
| Poila Boishakh (Bengali New Year) | Wed, 14 Apr 2027 | Chaitra Krishna Amavasya | Revati |
| Rath Yatra | Fri, 18 Jun 2027 | Ashadha Shukla Dwitiya | Pushya |
| Janmashtami | Thu, 5 Aug 2027 | Shravana Krishna Ashtami | Rohini |
| Durga Puja (Shashti) | Sat, 2 Oct 2027 | Ashwin Shukla Shashthi | Uttara Phalguni |
| Durga Puja (Saptami) | Sun, 3 Oct 2027 | Ashwin Shukla Saptami | Hasta |
| Durga Puja (Ashtami) | Mon, 4 Oct 2027 | Ashwin Shukla Ashtami | Chitra |
| Durga Puja (Navami) | Tue, 5 Oct 2027 | Ashwin Shukla Navami | Swati |
| Vijaya Dashami (Bisarjan) | Wed, 6 Oct 2027 | Ashwin Shukla Dashami | Vishakha |
| Lakshmi Puja | Wed, 13 Oct 2027 | Ashwin Purnima | Ashwini |
| Kali Puja / Diwali | Thu, 28 Oct 2027 | Kartik Krishna Amavasya | Chitra |
| Chhath Puja | Mon, 1 Nov 2027 | Kartik Shukla Shashthi | Mula |
Start and end dates in the Gregorian calendar for each Bengali month. After the Saha reform, Boishakh through Bhadro have 31 days and Ashwin through Choitro have 30 days. The Bengali year (Bangabda) runs from mid-April to mid-April.
| Bengali Month | বাংলা | 2026 | 2027 |
|---|---|---|---|
| Boishakh 1433 | বৈশাখ ১৪৩৩ | 14 Apr 2026 — 14 May 2026 | 14 Apr 2027 — 14 May 2027 |
| Joishto | জ্যৈষ্ঠ | 15 May 2026 — 14 Jun 2026 | 15 May 2027 — 14 Jun 2027 |
| Asharh | আষাঢ় | 15 Jun 2026 — 15 Jul 2026 | 15 Jun 2027 — 15 Jul 2027 |
| Shrabon | শ্রাবণ | 16 Jul 2026 — 15 Aug 2026 | 16 Jul 2027 — 15 Aug 2027 |
| Bhadro | ভাদ্র | 16 Aug 2026 — 15 Sep 2026 | 16 Aug 2027 — 15 Sep 2027 |
| Ashwin | আশ্বিন | 16 Sep 2026 — 15 Oct 2026 | 16 Sep 2027 — 15 Oct 2027 |
| Kartik | কার্তিক | 16 Oct 2026 — 14 Nov 2026 | 16 Oct 2027 — 14 Nov 2027 |
| Ogrohayon | অগ্রহায়ণ | 15 Nov 2026 — 14 Dec 2026 | 15 Nov 2027 — 14 Dec 2027 |
| Poush | পৌষ | 15 Dec 2026 — 13 Jan 2027 | 15 Dec 2027 — 13 Jan 2028 |
| Magh | মাঘ | 14 Jan 2027 — 12 Feb 2027 | 14 Jan 2028 — 12 Feb 2028 |
| Falgun | ফাল্গুন | 13 Feb 2027 — 14 Mar 2027 | 13 Feb 2028 — 14 Mar 2028 |
| Choitro | চৈত্র | 15 Mar 2027 — 13 Apr 2027 | 15 Mar 2028 — 13 Apr 2028 |
The origin of the Bangabda era is debated. Some scholars attribute it to King Shashanka of the Gauda Kingdom in 594 CE, while others connect it to Mughal Emperor Akbar's Fasli calendar reform of 1556 CE. Regardless of its origin, the calendar was used throughout Bengal for centuries in its unreformed sidereal form, with months of variable length tied to the Sun's transit through the zodiac signs. The landmark reform came in 1966 when the Calendar Reform Committee led by the renowned astrophysicist Dr. Meghnad Saha (known for the Saha ionization equation) standardised the month lengths and synchronised leap years with the Gregorian system.
The Bengali Panjika is far more than a calendar — it is an integral part of Bengali cultural identity. Publishing houses like Gupta Press (established 1875) and the Bishudha Siddhanta Panjika release comprehensive almanacs each year containing daily tithi, nakshatra, yoga, karana, planetary positions, marriage muhurtas, agricultural advice, and auspicious/inauspicious timings. For Bengali families, the annual Panjika purchase is as essential as buying new clothes for Poila Boishakh. The Panjika also serves as a historical record — notable events, eclipses, and cultural milestones are annotated year after year, creating a continuous chronicle of Bengali life.
A unique feature of the Bengali calendar is its dual nature: while civil dates follow the reformed solar system, all religious festivals are determined by lunar tithis. Durga Puja is fixed to Ashwin Shukla Shashthi through Dashami, Kali Puja falls on Kartik Amavasya, and Saraswati Puja is observed on Magha Shukla Panchami. This dual system — solar for civil life, lunar for sacred life — makes the Bengali calendar distinctive among Indian calendrical traditions. The Panjika astronomers compute the exact moment of each tithi transition to determine festival timings, which is why different Panjika publishers sometimes prescribe slightly different observance dates.
The Bangabda (Bengali era) counts from 594 CE. The current Bengali year is Bangabda 1433 (14 April 2026 to 13 April 2027). The formula is: Gregorian year minus 593 (after 14 April) or minus 594 (before 14 April). Bangabda 1434 begins on 14 April 2027. This era predates the Mughal period and is one of the oldest continuously used calendar eras in South Asia, alongside the Saka era (78 CE) and the Vikram Samvat (57 BCE).