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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.