Replace dateutil.tz with ZoneInfo and tzlocal.

pyproject.toml

@@ -14,8 +14,8 @@ readme = "README.md"
 requires-python = ">=3.6"
 dependencies = [
     "clp-ffi-py >= 0.0.9",
-    "python-dateutil >= 2.7.0",
     "typing-extensions >= 3.7.4",
+	"tzlocal >= 5.2",
     "zstandard >= 0.18.0",
 ]
 classifiers = [

src/clp_logging/handlers.py

@@ -13,7 +13,7 @@
 from types import FrameType
 from typing import Callable, ClassVar, Dict, IO, Optional, Tuple, Union
 
-import dateutil.tz
+import tzlocal
 from clp_ffi_py.ir import FourByteEncoder
 from zstandard import FLUSH_FRAME, ZstdCompressionWriter, ZstdCompressor
 
@@ -59,12 +59,8 @@ def _init_timeinfo(fmt: Optional[str], tz: Optional[str]) -> Tuple[str, str]:
     if not fmt:
         fmt = "yyyy-MM-d H:m:s.A"
     if not tz:
-        tzf: Optional[tzinfo] = dateutil.tz.gettz()
-        if tzf:
-            tzp: Path = Path.resolve(Path(tzf._filename))  # type: ignore
-            tz = "/".join([tzp.parent.name, tzp.name])
-        else:
-            tz = "UTC"
+        tz = tzlocal.get_localzone_name()
+
     return fmt, tz
 
 

src/clp_logging/readers.py

@@ -4,8 +4,8 @@
 from sys import stderr
 from types import TracebackType
 from typing import IO, Iterator, List, Match, Optional, Tuple, Type, Union
+from zoneinfo import ZoneInfo
 
-import dateutil.tz
 from clp_ffi_py.ir import FourByteEncoder
 from zstandard import ZstdDecompressionReader, ZstdDecompressor
 
@@ -186,7 +186,7 @@ def read_preamble(self) -> int:
             # We do not use the timestamp pattern from the preamble as it may
             # be from other languages and therefore incompatible.
             # self.timestamp_format = self.metadata[METADATA_TIMESTAMP_PATTERN_KEY]
-            self.timezone = dateutil.tz.gettz(self.metadata[METADATA_TZ_ID_KEY])
+            self.timezone = ZoneInfo(self.metadata[METADATA_TZ_ID_KEY])
         return self.pos
 
     @abstractmethod