fix for tzdata missing in windows

src/pyopensky/__init__.py

@@ -1,3 +1,13 @@
+import sys
 from importlib.metadata import version
 
+from .tzdata import download_tzdata_windows
+
 __version__ = version("pyopensky")
+
+# Despite the 'win32' string, this value is returned on all versions of Windows,
+# including both 32-bit and 64-bit. The 'win32' identifier is a historical
+# artifact that has been retained for compatibility with older versions of
+# Python.
+if sys.platform == "win32":
+    download_tzdata_windows(year=2022)

src/pyopensky/tzdata.py

@@ -0,0 +1,48 @@
+# While Arrow uses the OS-provided timezone database on Linux and macOS, it
+# requires a user-provided database on Windows. You must download and extract
+# the text version of the IANA timezone database and add the Windows timezone
+# mapping XML.
+# https://arrow.apache.org/docs/cpp/build_system.html#runtime-dependencies
+
+from __future__ import annotations
+
+import os
+import tarfile
+from pathlib import Path
+
+import httpx
+
+
+def download_tzdata_windows(
+    year: int = 2022,
+    *,
+    name: str = "tzdata",
+    base_dir: None | Path = None,
+) -> None:
+    folder = (
+        base_dir if base_dir else Path(os.path.expanduser("~")) / "Downloads"
+    )
+
+    if (folder / name).is_dir():
+        return
+
+    tz_path = folder / "tzdata.tar.gz"
+
+    c = httpx.get(
+        f"https://data.iana.org/time-zones/releases/tzdata{year}f.tar.gz"
+    )
+    c.raise_for_status()
+    tz_path.write_bytes(c.content)
+
+    extracted_folder = folder / name
+
+    if not extracted_folder.exists():
+        extracted_folder.mkdir(parents=True)
+
+    tarfile.open(tz_path).extractall(extracted_folder)
+
+    c = httpx.get(
+        "https://raw.githubusercontent.com/unicode-org/cldr/master/common/supplemental/windowsZones.xml"
+    )
+    c.raise_for_status()
+    (extracted_folder / "windowsZone.xml").write_bytes(c.content)