Hindu Months in Bihar

Bihar follows the Purnimanta calendar: each month starts the day after Purnima and ends on the next Purnima.

Month	Hindi	Roughly	Festivals in Bihar
Chaitra	चैत्र	Mar–Apr	Chaiti Chhath, Ram Navami, Satuani
Vaishakha	वैशाख	Apr–May	Akshaya Tritiya, Janaki Navami, Buddha Purnima
Jyeshtha	ज्येष्ठ	May–Jun	Vat Savitri, Kabir Jayanti
Ashadha	आषाढ़	Jun–Jul	Rath Yatra, Guru Purnima
Shravana	श्रावण	Jul–Aug	Shravani Mela, Madhushravani, Rakhi
Bhadrapada	भाद्रपद	Aug–Sep	Janmashtami, Teej, Chaurchan
Ashwin	आश्विन	Sep–Oct	Jitiya, Pitru Paksha, Durga Puja, Kojagara
Kartik	कार्तिक	Oct–Nov	Diwali, Chhath, Sama-Chakeva, Sonepur Mela
Margashirsha	मार्गशीर्ष	Nov–Dec	Vivah Panchami
Pausha	पौष	Dec–Jan	Guru Gobind Singh Jayanti, Makar Sankranti
Magha	माघ	Jan–Feb	Saraswati Puja, Mauni Amavasya
Phalguna	फाल्गुन	Feb–Mar	Mahashivratri, Holi (Phagua)

Adhik maas

About every 32 months a lunar month passes without the Sun changing sign, and it is repeated as Adhik or Purushottam maas. 2026: Ashadha, Jyeshtha; 2027: none.

Purnimanta vs Amanta

In Amanta regions (Gujarat, Maharashtra, south India) the month ends on Amavasya. The tithi is the same everywhere; only the month name in Krishna paksha changes. So Bihar's "Kartik Krishna Amavasya" Diwali is "Ashwin Amavasya" in Gujarat.