Prevent OverflowError from very large timedeltas in Mutes (#6353)

redbot/cogs/mutes/converters.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 import logging
 import re
 from typing import Optional, TypedDict
-from datetime import timedelta
+from datetime import timedelta, datetime, timezone
 from typing_extensions import Annotated
 
 from discord.ext.commands.converter import Converter
@@ -29,6 +29,7 @@ def _edgematch(pattern: re.Pattern[str], argument: str) -> Optional[re.Match[str
 class _MuteTime(TypedDict, total=False):
     duration: timedelta
     reason: str
+    until: datetime
 
 
 class _MuteTimeConverter(Converter):
@@ -57,6 +58,8 @@ class _MuteTimeConverter(Converter):
                     )
             try:
                 result["duration"] = duration = timedelta(**time_data)
+                result["until"] = ctx.message.created_at + duration
+                # Catch if using the timedelta with the current date will also result in an Overflow error
             except OverflowError:
                 raise commands.BadArgument(
                     _("The time provided is too long; use a more reasonable time.")