workalendar
Worldwide holidays and working days helper and toolkit.
Decision gist · record as of 2026-08-14
Yes, if you need working-day arithmetic or holiday lookups for one or more countries. The package is production-stable, has low install friction, carries no known vulnerabilities, and covers a wide geographic scope. However, maintenance is dormant (last release January 2023), so be aware that calendar updates may lag behind official changes; verify accuracy for mission-critical use cases against official sources.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.7+.
- On Python 3.7–3.8, backports.zoneinfo and tzdata (Windows only) are conditional dependencies; Python 3.9+ uses stdlib zoneinfo.
- Low install friction: pure Python wheel with seven runtime dependencies (date utilities, lunar/solar calendar support, timezone data).
License · maintenance · safety
MIT License (permissive) — MIT License is permissive; you may use, modify, and distribute this package freely in commercial and open-source projects with minimal restrictions.
last release 2023-01-01 (1321 days) · last repo commit 2024-04-12 · 951 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 1,467,370 downloads/mo, #3,875 on PyPI
Alternatives
Verify before relying
pip install workalendar
from datetime import date
from workalendar.europe import France
cal = France()
print(cal.is_working_day(date(2012, 12, 25))) # False (Christmas)
print(cal.add_working_days(date(2012, 12, 23), 5)) # date(2012, 12, 31)- Accuracy of Islamic calendar and other computed holidays relative to official religious authority decisions
- Completeness of calendar coverage—documentation notes some calendars may not be fully up-to-date and not all countries are covered
What it is and what it does
Workalendar is a Python library that maintains holiday calendars for countries and regions worldwide and provides utilities to work with working days. It lets you query whether a specific date is a working day (accounting for weekends and holidays), retrieve lists of holidays for a given year, and perform arithmetic on dates by adding or subtracting working days. The library bundles pre-computed astronomical values for calendars that depend on equinoxes or solar terms (such as Asian calendars) for years 1991–2051, with optional support for computing these values dynamically via the astronomy extra.
The package is built on date utilities (python-dateutil), lunar and solar calendar libraries (lunardate, convertdate, pyluach), and timezone support (tzdata, backports.zoneinfo, importlib-metadata). It covers a broad geographic scope—Europe, the Americas, Asia, Oceania, and Africa—with support for regional and sub-regional calendars (e.g., Swiss cantons, US states, Brazilian cities). The library is marked production-ready but carries a caveat that some calendars may not be 100% accurate, particularly Islamic calendars, and not all countries are yet supported.
Use it for
- Calculate SLA deadlines by adding working days to a ticket creation date, excluding weekends and country-specific holidays.
- Validate whether a given date falls on a working day for payroll, scheduling, or business logic in multi-country applications.
- Generate holiday lists for a year to populate calendars, planning tools, or HR systems for a specific country or region.
- Compute business day offsets for financial settlement dates, delivery windows, or project timelines across different jurisdictions.
- Build international scheduling systems that respect local holidays and working-day conventions without hardcoding dates.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need working-day arithmetic or holiday lookups for one or more countries.
The package is production-stable, has low install friction, carries no known vulnerabilities, and covers a wide geographic scope. However, maintenance is dormant (last release January 2023), so be aware that calendar updates may lag behind official changes; verify accuracy for mission-critical use cases against official sources.
Install
workalendar on PyPI
Before you install
Low install friction: pure Python wheel with seven runtime dependencies (date utilities, lunar/solar calendar support, timezone data). Maintenance is dormant—last release was January 2023, over a year ago, though the repository remains active with recent commits and no archived status.
Requires Python 3.7+. On Python 3.7–3.8, backports.zoneinfo and tzdata (Windows only) are conditional dependencies; Python 3.9+ uses stdlib zoneinfo.
License in practice
MIT License is permissive; you may use, modify, and distribute this package freely in commercial and open-source projects with minimal restrictions.
Quickstart
pip install workalendar
from datetime import date
from workalendar.europe import France
cal = France()
print(cal.is_working_day(date(2012, 12, 25))) # False (Christmas)
print(cal.add_working_days(date(2012, 12, 23), 5)) # date(2012, 12, 31)Verify before relying
- Accuracy of Islamic calendar and other computed holidays relative to official religious authority decisions
- Completeness of calendar coverage—documentation notes some calendars may not be fully up-to-date and not all countries are covered
Package facts
| License | MIT License permissive |
| Python support | Supports the current Python release >=3.7 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 7 packagespython-dateutillunardateconvertdatepyluachtzdataimportlib-metadatabackports.zoneinfo |
| Maintenance | Dormant 1,321 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 1,467,370 / month, #3,875 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableIntended Audience :: DevelopersLicense :: OSI Approved :: MIT LicenseProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.7Programming Language :: Python :: 3.8Programming Language :: Python :: 3.9 |
Evidence: workalendar-17.0.0-py3-none-any.whl
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See also holidays · tkcalendar · workadays · chinese-calendar · jpholiday · govuk-bank-holidays · pandas_market_calendars · business-duration · convertdate · exchange_calendars