airac-tools

airac-tools is a Python package for working with ICAO AIRAC (Aeronautical Information Regulation And Control) cycles.
It provides a variety of utilities to determine cycle dates, validate cycle strings, perform conversions, iterate over cycles, and more.

Features

• Cycle Information Functions

  • get_current_cycle(date: datetime = None) -> str: Get the current AIRAC cycle for a given date.
  • get_next_cycle(date: datetime = None) -> str: Get the next AIRAC cycle after a given date.
  • get_previous_cycle(date: datetime = None) -> str: Get the previous AIRAC cycle.
  • get_cycle_start_date(cycle: str) -> datetime: Get the start date of a given AIRAC cycle.
  • get_cycle_end_date(cycle: str) -> datetime: Get the end date of a given AIRAC cycle.

• Date Conversion Functions

  • date_to_cycle(date: datetime) -> str: Convert any date to its corresponding AIRAC cycle.
  • cycle_to_date(cycle: str) -> datetime: Convert an AIRAC cycle to its start date.

• Validation Functions

  • is_valid_cycle(cycle: str) -> bool: Check if a given cycle string (like '2309') is valid.
  • is_date_in_cycle(date: datetime, cycle: str) -> bool: Check if a date falls within a specific cycle.

• Listing/Iteration Functions

  • list_cycles(year: int) -> list[str]: List all AIRAC cycles for a given year.
  • cycles_between(start_cycle: str, end_cycle: str) -> list[str]: List all cycles between two cycles.
  • dates_between(start_cycle: str, end_cycle: str) -> list[datetime]: List start dates for each cycle in a range.

• Utility Functions

  • cycle_offset(cycle: str, offset: int) -> str: Returns the cycle offset by N cycles.
  • format_cycle(cycle: str) -> str: Returns a human-readable cycle string.

Installation

Install from PyPI (when published):

pip install airac-tools

Or install locally (for development):

git clone https://github.com/jj-sm/airac-tools.git
cd airac-tools
pip install .

Usage

from airac_tools import cycle

# Get current AIRAC cycle
current_cycle = cycle.get_current_cycle()
print(cycle)  # e.g., '2308'

# List all cycles in 2025
cycles_2025 = cycle.list_cycles(2025)
print(cycles_2025)  # ['2501', ..., '2513']

# Convert date to cycle
from datetime import datetime, timezone
cycle_2 = cycle.date_to_cycle(datetime(2024, 8, 10, tzinfo=timezone.utc))
print(cycle)  # e.g., '2408'

# Get cycle start/end dates
start = cycle.get_cycle_start_date('2408')
end = cycle.get_cycle_end_date('2408')
print(start, end)

# Check if date is within a cycle
cycle.is_date_in_cycle(datetime(2024, 8, 10, tzinfo=timezone.utc), '2408')  # True

# Cycle offset
cycle.cycle_offset('2408', 2)  # '2410'

# Format cycle
from airac_tools import utils
print(utils.format_cycle('2408'))  # 'AIRAC 24/08'

Development

• Clone the repository and install in editable mode:

  pip install -e .
  

• Run tests with:

  pytest
  

• Code is formatted with PEP8.
• Contributions and issues are welcome!

License

MIT License.

Acknowledgements

AIRAC cycle rules are based on ICAO documentation and public sources.