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

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

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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)

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 @@ -150,11 +150,13 @@ 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
================================================================ ==========================

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

* ``tzdata`` is only required on Windows.

.. _install.optional_dependencies:

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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2 changes: 1 addition & 1 deletion pyproject.toml
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Expand Up @@ -29,7 +29,7 @@ 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.

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