imp: Raise error when reminder time is in the past

l10n/en-US.yaml

@@ -105,3 +105,4 @@ leap_year_notify_embed_description: On a non-leap year, February 29th doesn't ex
 notify_on_mar_1: Notify me on March 1st
 notify_on_feb_28: Notify me on February 28th
 dont_notify: Don't notify me
+not_future_time_error: The reminder time must be in the future

lumina/cogs/reminder.py

@@ -9,7 +9,7 @@
 from discord.ext import commands
 
 from lumina.components import Modal, Paginator, TextInput
-from lumina.exceptions import NoRemindersError, ReminderNotFoundError
+from lumina.exceptions import NoRemindersError, NotFutureTimeError, ReminderNotFoundError
 from lumina.l10n import LocaleStr
 from lumina.models import LuminaUser, Reminder, get_locale, get_timezone
 from lumina.utils import get_now, shorten_text, split_list_to_chunks
@@ -38,7 +38,10 @@ def __init__(self, bot: Lumina) -> None:
     def natural_language_to_dt(time: str, timezone: int) -> datetime.datetime:
         cal = parsedatetime.Calendar()
         time_struct, _ = cal.parse(time, get_now(timezone))
-        return datetime.datetime(*time_struct[:6]).replace(tzinfo=datetime.timezone(datetime.timedelta(hours=timezone)))
+        dt = datetime.datetime(*time_struct[:6]).replace(tzinfo=datetime.timezone(datetime.timedelta(hours=timezone)))
+        if dt < get_now(timezone):
+            raise NotFutureTimeError
+        return dt
 
     async def cog_load(self) -> None:
         self.bot.tree.add_command(self.set_reminder_ctx_menu)

lumina/exceptions.py

@@ -57,3 +57,8 @@ def __init__(self) -> None:
 class NoteNotFoundError(LuminaError):
     def __init__(self) -> None:
         super().__init__(LocaleStr("note_not_found_title"))
+
+
+class NotFutureTimeError(LuminaError):
+    def __init__(self) -> None:
+        super().__init__(LocaleStr("not_future_time_error"))