Replace datetime.utcnow + datetime.utcfromtimestamp (#1809)

Starting with Python 3.12, `datetime.utcnow` and
`datetime.utcfromtimestamp` will be deprecated.


https://docs.python.org/3.12/library/datetime.html#datetime.datetime.utcnow

https://docs.python.org/3.12/library/datetime.html#datetime.datetime.utcfromtimestamp

miio/miioprotocol.py

@@ -7,7 +7,7 @@
 import codecs
 import logging
 import socket
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from pprint import pformat as pf
 from typing import Any, Dict, List, Optional
 
@@ -48,7 +48,7 @@ def __init__(
 
         self._discovered = False
         # these come from the device, but we initialize them here to make mypy happy
-        self._device_ts: datetime = datetime.utcnow()
+        self._device_ts: datetime = datetime.now(tz=timezone.utc)
         self._device_id = b""
 
     def send_handshake(self, *, retry_count=3) -> Message:

miio/miot_cloud.py

@@ -1,7 +1,7 @@
 """Module implementing handling of miot schema files."""
 import json
 import logging
-from datetime import datetime, timedelta
+from datetime import datetime, timedelta, timezone
 from operator import attrgetter
 from pathlib import Path
 from typing import Dict, List, Optional
@@ -114,10 +114,9 @@ def _write_to_cache(self, file: Path, data: Dict):
     def _file_from_cache(self, file, cache_hours=6) -> Dict:
         def _valid_cache():
             expiration = timedelta(hours=cache_hours)
-            if (
-                datetime.fromtimestamp(file.stat().st_mtime) + expiration
-                > datetime.utcnow()
-            ):
+            if datetime.fromtimestamp(
+                file.stat().st_mtime, tz=timezone.utc
+            ) + expiration > datetime.now(tz=timezone.utc):
                 return True
 
             return False

miio/protocol.py

@@ -143,7 +143,7 @@ def _encode(self, obj, context, path):
         return calendar.timegm(obj.timetuple())
 
     def _decode(self, obj, context, path):
-        return datetime.datetime.utcfromtimestamp(obj)
+        return datetime.datetime.fromtimestamp(obj, tz=datetime.timezone.utc)
 
 
 class EncryptionAdapter(Adapter):
@@ -214,7 +214,13 @@ def _decode(self, obj, context, path) -> Union[Dict, bytes]:
             "length" / Rebuild(Int16ub, Utils.get_length),
             "unknown" / Default(Int32ub, 0x00000000),
             "device_id" / Hex(Bytes(4)),
-            "ts" / TimeAdapter(Default(Int32ub, datetime.datetime.utcnow())),
+            "ts"
+            / TimeAdapter(
+                Default(
+                    Int32ub,
+                    datetime.datetime.now(tz=datetime.timezone.utc),
+                )
+            ),
         )
     ),
     "checksum"