refactor: remove dependency on pytz (#90)

.pre-commit-config.yaml

@@ -58,7 +58,6 @@ repos:
     rev: v1.3.0
     hooks:
       - id: mypy
-        additional_dependencies: [types-pytz>=2023.3.0.0]
   - repo: https://github.com/PyCQA/bandit
     rev: 1.7.4
     hooks:

pyproject.toml

@@ -32,7 +32,6 @@ myst-parser = {version = "^0.18", optional = true}
 bluetooth-sensor-state-data = ">=1.6.1"
 sensor-state-data = ">=2.16.1"
 bluetooth-data-tools = ">=0.1.2"
-pytz = "^2023.3"
 cryptography = ">=40.0.0"
 
 [tool.poetry.extras]

src/bthome_ble/parser.py

@@ -13,11 +13,10 @@
 import logging
 import struct
 import sys
-from datetime import datetime
+from datetime import datetime, timezone
 from enum import Enum
 from typing import Any
 
-import pytz
 from bluetooth_data_tools import short_address
 from bluetooth_sensor_state_data import BluetoothData
 from cryptography.exceptions import InvalidTag
@@ -92,7 +91,7 @@ def parse_string(data_obj: bytes) -> str | None:
 def parse_timestamp(data_obj: bytes) -> datetime:
     """Convert bytes to a datetime object."""
     value = datetime.fromtimestamp(
-        int.from_bytes(data_obj, "little", signed=False), tz=pytz.utc
+        int.from_bytes(data_obj, "little", signed=False), tz=timezone.utc
     )
     _LOGGER.error("time %s", value)
     return value