{"library":"tzdata","type":"library","category":null,"description":"tzdata is a data-only Python package containing zic-compiled binaries for the IANA time zone database, maintained by the CPython core developers. It serves as a cross-platform fallback for the standard library's zoneinfo module (Python 3.9+, PEP 615) on systems that lack system-level zone data — most critically Windows. The current version is 2025.3 (wrapping upstream IANA tzdata 2025c). Releases track IANA upstream closely, typically producing between 3 and 10+ releases per year in response to real-world timezone rule changes.","language":"python","status":"active","version":"2025.3","tags":["timezone","iana","zoneinfo","datetime","stdlib-companion","windows","data-package","pep615"],"last_verified":"Tue Jun 09","install":[{"cmd":"pip install tzdata","imports":["from zoneinfo import ZoneInfo  # stdlib (Python 3.9+); tzdata is consumed automatically as a fallback","import tzdata; print(tzdata.IANA_VERSION)","from importlib import resources\nwith resources.open_binary('tzdata.zoneinfo.America', 'New_York') as f:\n    data = f.read()"]},{"cmd":"uv add tzdata","imports":[]}],"homepage":null,"github":"https://github.com/python/tzdata","docs":"https://tzdata.python.org","changelog":null,"pypi":"https://pypi.org/project/tzdata/","npm":null,"openapi_spec":null,"status_page":null,"smithery":null,"compatibility":{"summary":{"python_range":"3.10–3.9","success_rate":100,"avg_install_s":1.7,"avg_import_s":null,"wheel_type":"wheel"},"url":"https://checklist.day/v1/registry/tzdata/compatibility"}}