iso-week-date
Toolkit to work with str representing ISO Week date format
Decision gist · record as of 2026-08-14
Yes. Low install friction, no mandatory dependencies, active maintenance, MIT license, and zero known vulnerabilities make this a safe choice. Install it if you regularly work with ISO week formats or need to integrate week-based logic into pandas, polars pipelines, or pydantic validation.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.10 or later.
- Optional: pandas or polars for dataframe utilities; pydantic>=2.40 for validation integration.
- Low friction: pure Python wheel with no runtime dependencies.
License · maintenance · safety
MIT (permissive) — MIT license is permissive; you can use, modify, and distribute this package freely with minimal restrictions.
last release 2026-04-01 (135 days) · last repo commit 2026-08-01 · 10 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 291,022 downloads/mo, #7,978 on PyPI
Alternatives
Verify before relying
pip install iso-week-date
from iso_week_date import IsoWeek, IsoWeekDate
week = IsoWeek.from_string('2023-W01')
week_date = IsoWeekDate.from_string('2023-W01-D')- Performance characteristics when working with large series of ISO week dates.
- Specific behavior of custom offset feature and whether it handles all edge cases correctly.
- Whether the package handles leap weeks and other ISO 8601 edge cases.
What it is and what it does
iso-week-date provides classes and utilities to work with ISO Week date formats without the friction of repeatedly converting between strings, date objects, and datetime objects. The core classes—IsoWeek and IsoWeekDate—handle parsing from multiple input types, support arithmetic operations (addition/subtraction with integers), comparison, and range generation. IsoWeek lets you list all dates in a week or fetch the nth day; IsoWeekDate gives you the weekday as an integer and the containing ISO week as a string.
The package also includes optional modules for pandas and polars that convert between datetime series and ISO week strings, plus pydantic integration for validation. A distinctive feature is support for custom offsets—you can shift the week boundary by a timedelta to work with non-standard week definitions. It requires Python 3.10+ and has no mandatory runtime dependencies; pandas, polars, and pydantic are optional.
Use it for
- Convert a datetime series to ISO week format for reporting or data aggregation in pandas or polars workflows.
- Parse and validate ISO week strings in API payloads or configuration files using pydantic models.
- Perform week-based arithmetic without manual datetime manipulation.
- Check if a given date falls within a specific ISO week using containment operators.
- Work with custom week boundaries by applying a timedelta offset to the standard ISO definition.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Low install friction, no mandatory dependencies, active maintenance, MIT license, and zero known vulnerabilities make this a safe choice. Install it if you regularly work with ISO week formats or need to integrate week-based logic into pandas, polars pipelines, or pydantic validation.
Install
iso-week-date on PyPI
Before you install
Low friction: pure Python wheel with no runtime dependencies. Active maintenance with recent release (2026-04-01), last commit 2026-08-01, and support for current Python versions (3.10–3.14).
Requires Python 3.10 or later. Optional: pandas or polars for dataframe utilities; pydantic>=2.40 for validation integration.
License in practice
MIT license is permissive; you can use, modify, and distribute this package freely with minimal restrictions.
Quickstart
pip install iso-week-date
from iso_week_date import IsoWeek, IsoWeekDate
week = IsoWeek.from_string('2023-W01')
week_date = IsoWeekDate.from_string('2023-W01-D')Verify before relying
- Performance characteristics when working with large series of ISO week dates.
- Specific behavior of custom offset feature and whether it handles all edge cases correctly.
- Whether the package handles leap weeks and other ISO 8601 edge cases.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.10 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | None |
| Maintenance | Actively maintained 135 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 291,022 / month, #7,978 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/StableProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Programming Language :: Python :: Free Threading :: 2 - BetaTopic :: Software Development :: Libraries :: Python ModulesTyping :: Typed |
Evidence: iso_week_date-2.3.0-py3-none-any.whl
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See also isoweek · epiweeks · isodate · iso8601 · metomi-isodatetime · delta · aniso8601 · isoduration · ciso8601 · dateformat