aion-indian-market-calendar

This is an open-source Python package surface on Hugging Face. It is not a dataset.

LLM Capture

Component

aion-indian-market-calendar is a Python package for Indian market holidays, NSE and MCX session lookup, and market-open checks.

Install

pip install aion-indian-market-calendar

Upgrade

If you are using an older build, upgrade with:

pip install --upgrade aion-indian-market-calendar

v1.1.0 fixed incorrect market resolution for NFO and common index inputs.

v1.1.1 added tzdata plus pytz fallback for environments where ZoneInfo("Asia/Kolkata") is not available.

Canonical Import Path

from aion_indian_market_calendar import IndiaMarketCalendar, is_market_open, next_trading_day

Core Helpers

is_market_open(market: str = "NSE", at=None, year: int = 2026) -> bool
next_trading_day(market: str = "NSE", after=None, year: int = 2026)
IndiaMarketCalendar.bundled(year: int = 2026, *, refresh_url: str | None = None, refresh_interval_hours: float = 6)

Supported Input Resolution

The engine works on canonical market segments internally.

Examples of valid input normalization:

• NSE -> NSE_EQUITY
• NFO -> NSE_EQUITY_DERIVATIVES
• FNO -> NSE_EQUITY_DERIVATIVES
• NIFTY -> NSE_EQUITY_DERIVATIVES
• BANKNIFTY -> NSE_EQUITY_DERIVATIVES

Unknown inputs raise ValueError.

Quick Start

from aion_indian_market_calendar import is_market_open

is_market_open("NSE")
is_market_open("MCX")

Full Calendar Example

from datetime import datetime
import pytz

from aion_indian_market_calendar import IndiaMarketCalendar

cal = IndiaMarketCalendar.bundled(2026)
ist = pytz.timezone("Asia/Kolkata")
now = datetime.now(ist)

print(cal.is_market_open(now, "NSE_EQUITY"))

session = cal.get_session(now, "MCX")
for seg in session or []:
    print(seg.open, seg.close)

Session Response Shape

get_session(...) returns:

• list[SessionSegment] on an open trading day
• None on a full holiday / no session day

SessionSegment contains:

• market
• open
• close

Works For

• nse trading calendar python
• indian stock market calendar python
• mcx trading hours python
• is market open today india python
• market calendar api india
• intraday and algo trading systems that need correct session validation

Use This For

• holiday lookup
• trading-session lookup
• pre-open / evening-session aware execution guards
• MCX and NSE schedule validation before order execution

Do Not Use This For

• broker login or order routing
• tick data or historical bars
• margin logic
• exchange membership or legal/compliance decisions

Human Understanding

Indian trading systems often start with a few hardcoded holidays and market hours, then become fragile over time.

That usually fails because:

• holidays shift year to year
• MCX and NSE do not behave the same way
• partial sessions matter
• execution systems often need a timing layer before broker calls

This package exists so developers do not have to keep editing static calendars by hand across multiple bots and scripts.

For an aspiring developer, the main idea is simple:

• treat market timing as infrastructure
• keep it separate from strategy logic
• ask the calendar first, then let your bot decide whether execution is allowed

Basic English Example

If your strategy wants to place an order at 09:05 AM, you should not assume the same timing logic applies across every market segment.

This package helps answer:

• is the market open?
• which session applies right now?
• is today a full holiday or a partial session day?

Technical Example

from datetime import datetime

from aion_indian_market_calendar import IndiaMarketCalendar

cal = IndiaMarketCalendar.bundled(2026)
probe = datetime.fromisoformat("2026-01-27T10:00:00+05:30")

assert cal.get_session(probe, market="NFO") == cal.get_session(probe, market="NSE_EQUITY_DERIVATIVES")
assert cal.get_session(probe, market="NIFTY") == cal.get_session(probe, market="NSE_EQUITY_DERIVATIVES")

Market Input Handling

This package accepts:

• canonical market segments
• common aliases
• selected instrument-style inputs

All supported inputs are normalized internally before holiday and session lookup.

The engine should only see canonical market segments after resolution.

Live Refresh

calendar = IndiaMarketCalendar.bundled(
    2026,
    refresh_url="https://<username>.github.io/<repo>/live_events.json",
    refresh_interval_hours=4,
)

calendar.refresh()

Current behavior:

• live cache path:
  • ~/.aion_indian_market/live_cache.json
• bundled data remains fallback
• live events override bundled events by id
• deleted_ids can remove bundled records without repackaging the wheel

Delta Format

{
  "version": "20260430-001",
  "generated_at": "2026-04-30T10:00:00+05:30",
  "events": [],
  "deleted_ids": []
}

Structure

aion_indian_market_calendar/
├── __init__.py
├── _calendar.py
├── models.py
├── data/
│   └── events_2026.json
├── tests/
│   ├── conftest.py
│   └── test_calendar.py
├── pyproject.toml
└── README.md

Notes

• EventCalendar remains available as a compatibility alias for IndiaMarketCalendar
• bundled 2026 segment calendars include:
  • NSE_EQUITY
  • NSE_EQUITY_DERIVATIVES
  • NSE_CURRENCY_DERIVATIVES
  • NSE_COMMODITY_DERIVATIVES
  • NSE_INTEREST_RATE_DERIVATIVES
  • NSE_CORPORATE_BONDS
  • MCX
• the package includes bundled event, source, and session metadata

Use With AION News-to-Signal

This package can sit in front of a signal engine to:

• validate whether a signal lands inside a tradable session
• block execution on holidays
• separate signal reasoning from session-state validation

License

MIT.