Define the /time at command.

cogs/commands/time.py

@@ -1,6 +1,6 @@
 """Contains commands for time commands."""
 
-from datetime import UTC, datetime
+from datetime import MAXYEAR, MINYEAR, UTC, datetime
 
 import nextcord
 from nextcord.ext import commands
@@ -15,20 +15,87 @@ class TimeCog(commands.Cog, name="Time Commands"):
     async def time(self, interaction: nextcord.Interaction) -> None:
         """Parent slash command. Never called."""
 
-    @time.subcommand(description="1")
-    async def at(self, interaction: nextcord.Interaction) -> None:
-        pass
+    @time.subcommand(
+        description="Get a discord timestamp of the given game time. If date information is left blank, uses current day."  # noqa: E501
+    )
+    async def at(  # noqa: PLR0913
+        self,
+        interaction: nextcord.Interaction,
+        hour: int = nextcord.SlashOption(
+            description="The hour you want a timestamp of. Given in gametime/UTC.",
+            min_value=0,
+            max_value=23,
+            required=True,
+        ),
+        minute: int = nextcord.SlashOption(
+            description="The minute you want a timestamp of. Given in gametime/UTC.",
+            min_value=0,
+            max_value=59,
+            required=True,
+        ),
+        year: int = nextcord.SlashOption(
+            description="Year to make timestamp of.", required=False, min_value=MINYEAR, max_value=MAXYEAR
+        ),
+        month: int = nextcord.SlashOption(
+            description="Month to make timestamp of.", required=False, min_value=1, max_value=12
+        ),
+        day: int = nextcord.SlashOption(
+            description="Day to make timestamp of.", required=False, min_value=1, max_value=31
+        ),
+        ephemeral: bool = nextcord.SlashOption(  # noqa: FBT001
+            description="Whether the replying message will be public or not.", required=False, default=True
+        ),
+    ) -> None:
+        """
+        Replies with a discord timestamp of given UTC time.
 
-    @time.subcommand(description="1")
-    async def at_gametime(self, interaction: nextcord.Interaction) -> None:
-        pass
+        Args:
+            interaction (nextcord.Interaction): Interaction with the command.
+            hour (int): The hour in UTC to make the timestamp of..
+            minute (int): The minute in UTC to make the timestamp of..
+            year (int): The year to make the timestamp of.
+            month (int): The month to make the timestamp of.
+            day (int): The day to make the timestamp of.
+            ephemeral (bool): Whether the response is ephemeral or not.
+        """
+        gametime_today: datetime = datetime.now(tz=UTC).replace(hour=hour, minute=minute)
+
+        if year is not None:
+            gametime_today = gametime_today.replace(year=year)
+
+        if month is not None and day is not None:
+            try:
+                gametime_today = gametime_today.replace(month=month, day=day)
+            except ValueError:
+                await interaction.response.send_message(f"Day {day} is out of range for month {month}.", ephemeral=True)
+                return
+        else:
+            if month is not None:
+                try:
+                    gametime_today = gametime_today.replace(month=month)
+                except ValueError:
+                    await interaction.response.send_message(
+                        f"Today ({gametime_today.day}) is out of range for month {month}.", ephemeral=True
+                    )
+                    return
+
+            if day is not None:
+                try:
+                    gametime_today = gametime_today.replace(day=day)
+                except ValueError:
+                    await interaction.response.send_message(
+                        f"Day {day} is out of range for this month {gametime_today.month}.", ephemeral=True
+                    )
+                    return
+
+        await interaction.response.send_message(content=f"<t:{int(gametime_today.timestamp())}:t>", ephemeral=ephemeral)
 
     @time.subcommand(description="Get the current time in game.")
     async def gametime(
         self,
         interaction: nextcord.Interaction,
         ephemeral: bool = nextcord.SlashOption(  # noqa: FBT001
-            required=False, default=True, description="Whether the replying message will be public or not."
+            description="Whether the replying message will be public or not.", required=False, default=True
         ),
     ) -> None:
         """