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DEP: Remove tzdata as a hard dependency outside of Windows #63335

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jorisvandenbossche merged 8 commits into from
Dec 19, 2025
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DEP: Remove tzdata as a hard dependency outside of Windows #63335

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a8431f0
DEP: Remove tzdata as a hard dependency outside of Windows
rhshadrach Dec 11, 2025
de32dd2
Fixup
rhshadrach Dec 13, 2025
d8bc837
Add tests for error message
rhshadrach Dec 17, 2025
2fa15ec
Add tests for error message
rhshadrach Dec 17, 2025
213803a
Refinements
rhshadrach Dec 18, 2025
0680eae
Remove minimum pins
rhshadrach Dec 19, 2025
cca0dc0
Use sys_platform for Windows
rhshadrach Dec 19, 2025
63a6dd8
Update doc/source/getting_started/install.rst
jorisvandenbossche Dec 19, 2025
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2 changes: 1 addition & 1 deletion README.md
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Expand Up @@ -115,7 +115,7 @@ details, see the commit logs at https://github.com/pandas-dev/pandas.
## Dependencies
- [NumPy - Adds support for large, multi-dimensional arrays, matrices and high-level mathematical functions to operate on these arrays](https://www.numpy.org)
- [python-dateutil - Provides powerful extensions to the standard datetime module](https://dateutil.readthedocs.io/en/stable/index.html)
- [tzdata - Provides an IANA time zone database](https://tzdata.readthedocs.io/en/latest/)
- [tzdata - Provides an IANA time zone database](https://tzdata.readthedocs.io/en/latest/) (Only required on Windows)
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@jorisvandenbossche jorisvandenbossche Dec 17, 2025

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or emscriptem?


See the [full installation instructions](https://pandas.pydata.org/pandas-docs/stable/install.html#dependencies) for minimum supported versions of required, recommended and optional dependencies.

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4 changes: 3 additions & 1 deletion doc/source/getting_started/install.rst
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Expand Up @@ -150,9 +150,11 @@ Package Minimum support
================================================================ ==========================
`NumPy <https://numpy.org>`__ 1.26.0
`python-dateutil <https://dateutil.readthedocs.io/en/stable/>`__ 2.8.2
`tzdata <https://pypi.org/project/tzdata/>`__ 2023.3
`tzdata <https://pypi.org/project/tzdata/>`__ \* 2023.3
================================================================ ==========================

\* ``tzdata`` is only required on Windows and Pyodide (Emscripten).

Generally, the minimum supported version is ~2 years old from the release date of a major or minor pandas version.

.. _install.optional_dependencies:
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2 changes: 0 additions & 2 deletions doc/source/whatsnew/v3.0.0.rst
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Expand Up @@ -657,8 +657,6 @@ The following required dependencies were updated:
+=================+======================+
| numpy | 1.26.0 |
+-----------------+----------------------+
| tzdata | 2023.3 |
+-----------------+----------------------+

For `optional libraries <https://pandas.pydata.org/docs/getting_started/install.html>`_ the general recommendation is to use the latest version.
The following table lists the lowest version per library that is currently being tested throughout the development of pandas.
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3 changes: 0 additions & 3 deletions pandas/_libs/tslibs/timezones.pyx
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Expand Up @@ -59,9 +59,6 @@ cdef bint is_utc_zoneinfo(tzinfo tz):
utc_zoneinfo = zoneinfo.ZoneInfo("UTC")
except zoneinfo.ZoneInfoNotFoundError:
return False
# Warn if tzdata is too old, even if there is a system tzdata to alert
# users about the mismatch between local/system tzdata
import_optional_dependency("tzdata", errors="warn", min_version="2022.7")

return tz is utc_zoneinfo

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4 changes: 3 additions & 1 deletion pyproject.toml
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Expand Up @@ -29,7 +29,9 @@ requires-python = '>=3.11'
dependencies = [
"numpy>=1.26.0",
"python-dateutil>=2.8.2",
"tzdata>=2023.3"
"tzdata>=2023.3; platform_system == 'Windows'",
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@rhshadrach rhshadrach Dec 11, 2025

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With tests seeming to be fine with no minimum here (ref: #63264 (comment)), I'm wondering if we should remove the lower bound.

# Emscripten is the platform system for Pyodide.
"tzdata>=2023.3; platform_system == 'Emscripten'",
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@jorisvandenbossche jorisvandenbossche Dec 18, 2025

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I see some other packages use sys_platform != "emscripten" instead. Do we know if there is a preference? (I don't directly find a good source about this in the docs)

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@rhshadrach rhshadrach Dec 18, 2025

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Interesting, I took it from here.

https://pyodide.org/en/0.16.1/faq.html#how-to-detect-that-code-is-run-with-pyodide

But looking at the latest version of the docs, it now uses sys.platform.

https://pyodide.org/en/stable/usage/faq.html#how-to-detect-that-code-is-run-with-pyodide

Will update.

]
classifiers = [
'Development Status :: 5 - Production/Stable',
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