Eones 1.4.1

Elegant time manipulation and reasoning library

Eones

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Compatible with Python 3.9+ · No external dependencies · Portable and lightweight

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✨ What is Eones?

Eones is a minimalist, dependency-free library for expressive, clear, and powerful date/time manipulation. Inspired by natural language semantics, it allows you to manipulate, compare, and transform dates as if they were living entities.

"That is not dead which can eternal lie, and with strange aeons even death may die."
— Abdul Alhazred, Necronomicon

Philosophy

Eones is not a datetime replacement. It's a temporal reasoning layer.

Eones exists to fill the gap between Python's low-level datetime and the need for semantic, calendar-aware date manipulation:

• Using only the standard library (Python 3.9+)
• Providing a semantically rich and consistent API
• Supporting modern timezone-aware design with zoneinfo
• Maintaining modular and composable architecture through clear separation of responsibilities (Date, Delta, Range)

Eones is for:

• Developers who want to reason about time semantically, not just manipulate timestamps
• Teams that want zero external dependencies for maximum portability
• Projects where timezones, truncation, deltas and ranges are central domain logic

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📦 Installation

pip install "eones"

If you're working with timezones on Windows or containers:
⚠️ Also install tzdata:

pip install tzdata

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🧪 Basic Example

from eones import Eones

z = Eones("2025-06-15")
z.add(months=1, days=3)  # -> add 3 days and 1 month

print(z.format("%Y-%m-%d"))  # → 2025-07-18
print(z.diff_for_humans("2025-06-10"))  # → in 5 days
print(z.diff_for_humans("2025-06-20", locale="es"))  # → hace 5 días

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🔍 Key Features

• ✅ Zero external dependencies: Pure Python (Python 3.9+)
• ✅ Intuitive interface: Simple, semantically rich and easy-to-use API
• ✅ Modern timezone support: Robust handling with zoneinfo (not pytz)
• ✅ Flexible parsing: Accepts multiple date formats automatically, including ISO 8601 with timezone offsets
• ✅ Advanced temporal operations: Deltas, ranges and semantic comparisons
• ✅ Modular architecture: Clear separation between Date, Delta, Range and utilities
• ✅ Localization: Support for multiple languages
• ✅ Humanization: Converts time differences to readable text
• ✅ Complete type hinting: Fully typed following PEP 561
• ✅ Interoperability: Compatible with Python's standard datetime

Localization & Error Handling

You can add more languages by creating a new file in eones/locales/ with the translations for your locale. For example, fr.py for French.

Eones surfaces clear exceptions derived from EonesError. Invalid timezones raise InvalidTimezoneError, while unparsable strings raise InvalidFormatError.

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🧾 Comparison with other libraries

Why not Pendulum or Arrow?

Feature	Eones	Pendulum	Arrow	Delorean	dateutil	pytz
Modern timezone support	✅ (zoneinfo)	❌ (pytz)	❌ (pytz)	✅	⚠️	✅
External dependencies	✅ None	❌ Yes	❌ Yes	❌ Yes	❌ Yes	❌ Yes
Semantically rich API	✅ Rich	✅ Medium	✅ Medium	⚠️	❌	❌
Modular/facade architecture	✅ Yes	❌ No	❌ No	❌ No	❌ No	❌ No
Complete type hinting & PEP 561	✅ Yes	❌ Limited	❌ Limited	❌ No	❌ No	❌ No
High Performance (~1M ops/sec)	✅ Yes	❌ No	❌ No	❌ No	❌ No	❌ No
Memory Optimized (__slots__)	✅ Yes	❌ No	❌ No	❌ No	❌ No	❌ No
Zero-dep Localization (No Babel)	✅ Yes	❌ No	❌ No	❌ No	❌ No	❌ No
Dedicated Range/Period API	✅ Yes	✅ Yes	⚠️ Basic	⚠️ Basic	❌ No	❌ No
Date arithmetic (add/subtract)	✅	✅	✅	✅	❌	❌
Flexible parsing (string, dict, dt)	✅	✅	✅	⚠️	✅	❌
Coverage tested ≥ 97%	✅	❓	❓	❌	❌	❌
Can replace native datetime directly	✅	✅	✅	❌	❌	❌
Permissive license (MIT / BSD)	✅	✅	✅	✅	✅	✅
Actively maintained	✅	✅	✅	❌	✅	⚠️

See the numbers yourself: For detailed performance metrics (Speed, Memory, Profiling), check out our Benchmark Suite.

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📚 Documentation & Examples

Comprehensive examples and documentation are available:

📖 Core Examples

• Basic Usage - Library import, date creation, formatting, basic operations
• Advanced Usage - Truncation, rounding, period ranges, comparisons
• Complete Deltas - Dual delta architecture, calendar vs duration intervals
• Use Cases - Real-world examples: age calculation, billing cycles, reports
• Error Handling - Exception hierarchy, safe date creation, validation
• Formatting & Serialization - ISO 8601, JSON export/import, API integration
• Week Configuration - First day of week configuration, ISO vs US standards, weekend detection

🔗 Integration Examples

• Django: Custom model fields
• SQLAlchemy: Specialized column types
• REST APIs: Serialization utilities

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🔧 Tests & Coverage

tox

coverage html && open htmlcov/index.html

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📖 Requirements

• Python 3.9 or higher
• (Optional) tzdata if using timezones in systems without a local zoneinfo database

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📝 License

MIT © 2025 — Rodrigo Ezequiel Roldán
View full license