Amanta vs Purnimanta: Why Hindu Months Start on Different Days
Two lunar-month systems — Amanta (month ends on new moon) and Purnimanta (month ends on full moon) — explain why the same Hindu festival can fall in a different month name depending on your region. Neither is wrong.
Two lunar-month systems — Amanta (month ends on new moon) and Purnimanta (month ends on full moon) — explain why the same Hindu festival can fall in a different month name depending on your region. Neither is wrong.
Quick answer: There are two Hindu lunar-month systems. In Amanta (South/West India) a month ends on the new moon; in Purnimanta (North India) it ends on the full moon. So the same festival can carry different month names — e.g. Krishna Janmashtami on 4 September 2026 is Bhadrapada under Purnimanta but Shravana under Amanta. Neither system is more correct.
If you have ever seen the same festival described as falling in two different Hindu months, you have run into one of the most common sources of confusion in the Panchang: the difference between the Amanta and Purnimanta systems of reckoning lunar months. Both are valid, ancient, and widely followed — they simply choose a different point to end each month.
This guide explains both systems in plain language, shows which regions follow which, and works through a real 2026 example so you can see exactly why the same day can carry two different month names. Importantly, neither system is 'correct' or 'wrong'; they are two conventions applied to the very same sky.
- Amanta system: Month ends on Amavasya (new moon); followed in South & West India
- Purnimanta system: Month ends on Purnima (full moon); followed in North India
- Common tithis: Both share the same tithis; only the month label differs for the waning (Krishna) fortnight
- 2026 example: Krishna Janmashtami, 4 Sep 2026
- Key rule: Neither system is more authentic; follow your family/regional tradition
What is a lunar month in the Hindu calendar?
A Hindu lunar (chandra) month is roughly 29.5 days — the time the Moon takes to go through all its phases. Every month is divided into two fortnights (pakshas): the Shukla Paksha (waxing, bright half, from new moon toward full moon) and the Krishna Paksha (waning, dark half, from full moon toward new moon). This part is identical in both systems.
The disagreement is only about where one month ends and the next begins. Do you close the month at the new moon, or at the full moon? That single choice creates the entire Amanta–Purnimanta difference.
The Amanta system (South & West India)
'Amanta' literally means 'ending on the Amavasya (new moon).' In this system, each lunar month begins the day after a new moon and ends on the next new moon. The month therefore runs Shukla Paksha first, then Krishna Paksha, closing in darkness before the next month begins.
The Amanta reckoning is standard across most of South India — Andhra Pradesh, Telangana, Karnataka, Tamil Nadu, Kerala — and much of the West, including Maharashtra, Gujarat and Goa. If you follow Telugu, Kannada, Marathi or Gujarati traditions, you almost certainly use Amanta months.
The Purnimanta system (North India)
'Purnimanta' means 'ending on the Purnima (full moon).' Here each month ends on the full moon, so the month begins with the Krishna Paksha (waning half) and finishes with the Shukla Paksha (waxing half) at the full moon. North Indian states — Uttar Pradesh, Bihar, Madhya Pradesh, Rajasthan, Punjab, Haryana and much of the Hindi belt — follow Purnimanta.
Because Purnimanta closes the month later (at the full moon rather than the earlier new moon), the waning fortnight after a full moon gets 'pulled forward' into the next month's name compared with Amanta. That shift is the crux of the whole matter.
Why the same festival lands in different months
The tithi (lunar day), the paksha, and the actual date are the same in both systems. What differs is only the month name attached to the Krishna Paksha (waning fortnight). In Amanta, a Krishna-Paksha day belongs to the month that is about to end on the coming new moon. In Purnimanta, that very same day already belongs to the next month, because Purnimanta started that month back at the previous full moon.
So festivals in the bright half (Shukla Paksha) — like Ganesh Chaturthi or Rama Navami — carry the same month name in both systems. Only festivals in the dark half (Krishna Paksha) — like Janmashtami, Maha Shivaratri and Holika-eve — appear under two different month names.
| Feature | Amanta system | Purnimanta system |
|---|---|---|
| Month ends on | Amavasya (new moon) | Purnima (full moon) |
| Month begins with | Shukla Paksha (waxing) | Krishna Paksha (waning) |
| Main regions | South & West India | North India (Hindi belt) |
| Shukla-Paksha festivals | Same month name | Same month name |
| Krishna-Paksha festivals | Earlier month name | Next month name |
| Example languages | Telugu, Kannada, Marathi | Hindi, Bhojpuri, Rajasthani |
Worked example: Krishna Janmashtami 2026
Krishna Janmashtami is observed on the Ashtami tithi of the Krishna Paksha (the eighth day of the waning fortnight). In 2026 this falls on 4 September. Because it is a Krishna-Paksha festival, its month label differs between the two systems — the perfect illustration.
- In the Purnimanta system (North India), the month running from the previous full moon is Bhadrapada. So for a North Indian, Janmashtami 2026 falls in Bhadrapada, Krishna Paksha, Ashtami.
- In the Amanta system (South & West India), that same waning fortnight still belongs to Shravana, which will only end at the coming new moon. So for a South Indian, the same 4 September date is Shravana, Krishna Paksha, Ashtami.
- The tithi (Ashtami), the paksha (Krishna), and the date (4 Sep 2026) are identical. Only the month name — Bhadrapada vs Shravana — changes.
This is why a Delhi almanac may print 'Bhadrapada Krishna Ashtami' while a Hyderabad panchang prints 'Shravana Krishna Ashtami' for the very same Janmashtami. Both are right within their own convention. Always confirm the exact tithi start and end, and the fasting/parana timing, from a reliable local panchang for your city.
How to know which system you follow
- If your family speaks Telugu, Kannada, Tamil, Malayalam, Marathi, Konkani or Gujarati, you most likely follow Amanta.
- If your family speaks Hindi, Bhojpuri, Maithili, Rajasthani, Punjabi or is from the northern Hindi belt, you most likely follow Purnimanta.
- For Shukla-Paksha festivals (bright half), the month name is the same, so there is nothing to reconcile.
- For Krishna-Paksha festivals (dark half), simply use the month name your regional/family panchang prints — the date and tithi are the same either way.
- NRIs can pick whichever tradition their family carries; the observance day does not change, only the label.
Key takeaways
- Amanta ends on the new moon; Purnimanta ends on the full moon.
- Both systems share identical tithis, pakshas and dates.
- Only Krishna-Paksha (waning) festivals get two different month names.
- Janmashtami 2026 (4 Sep) is Bhadrapada in the North, Shravana in the South.
- Neither system is more authentic — follow your regional or family tradition.
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Frequently Asked Questions
What is the difference between Amanta and Purnimanta?
In the Amanta system a lunar month ends on the new moon (Amavasya) and is followed in South and West India. In the Purnimanta system a month ends on the full moon (Purnima) and is followed in North India. The tithis are identical; only the month name attached to the waning fortnight differs.
Which system is correct — Amanta or Purnimanta?
Neither is 'more correct.' Both are ancient, valid conventions applied to the same sky. They simply choose a different point — new moon or full moon — to end a month. Follow whichever your family or regional tradition uses.
Why does Janmashtami fall in a different month in North and South India?
Janmashtami is a Krishna-Paksha (waning fortnight) festival. In Purnimanta (North) that fortnight already belongs to Bhadrapada, while in Amanta (South) it still belongs to Shravana. The date and tithi are the same — only the month label changes.
What date is Krishna Janmashtami in 2026?
Krishna Janmashtami falls on 4 September 2026 on Krishna Paksha Ashtami. It is Bhadrapada Krishna Ashtami under the Purnimanta system and Shravana Krishna Ashtami under the Amanta system. Confirm exact tithi and parana timing from a local panchang.
Do Shukla-Paksha festivals differ between the two systems?
No. Festivals in the Shukla Paksha (bright, waxing half) such as Ganesh Chaturthi or Rama Navami carry the same month name in both systems. Only Krishna-Paksha (dark half) festivals get two different month labels.
Which states follow the Amanta system?
Most of South India — Andhra Pradesh, Telangana, Karnataka, Tamil Nadu, Kerala — and much of the West including Maharashtra, Gujarat and Goa follow the Amanta system, ending each month on the new moon.
Which states follow the Purnimanta system?
North Indian states in the Hindi belt — Uttar Pradesh, Bihar, Madhya Pradesh, Rajasthan, Punjab and Haryana — follow Purnimanta, ending each month on the full moon.
How do I know which system my family follows?
As a rule of thumb, Telugu, Kannada, Marathi and Gujarati families usually follow Amanta, while Hindi-belt families follow Purnimanta. For a waning-fortnight festival, just use the month name your local panchang prints; the observance date stays the same.
