common.py: use tz-aware datetime for proper timestamp display

https://docs.pycord.dev/en/stable/api/data_classes.html#discord.Embed.timestamp

CHANGELOG.md

@@ -7,6 +7,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 ## [Unreleased]
 ### Fixed
 - Issue where embeds would not work for users without avatars (#467).
+- Issue where embeds would show the wrong timezone.
 
 
 ## [2.9.0] - 2023-01-13

common.py

@@ -12,7 +12,7 @@ import enum
 import json
 import re
 import traceback
-from datetime import datetime
+from datetime import datetime, timezone
 from pathlib import Path
 from types import SimpleNamespace
 from typing import Union
@@ -165,7 +165,7 @@ class GlobalChannelConverter(commands.IDConverter):
 
 def embed_factory(ctx: commands.Context) -> discord.Embed:
     """Creates an embed with neutral colour and standard footer."""
-    embed = discord.Embed(timestamp=datetime.utcnow(), colour=colours.neutral)
+    embed = discord.Embed(timestamp=datetime.now(timezone.utc), colour=colours.neutral)
     if ctx.author:
         embed.set_footer(text=str(ctx.author), icon_url=str(ctx.author.display_avatar))
     return embed