fix: honor recurrence cutoff in occurrence generation

backend/mvp.py

@@ -83,17 +83,20 @@ def occurrences(rule: str, starts: datetime, start: datetime, end: datetime, cut
     count = int(parts.get("COUNT", 100000))
     if "UNTIL" in parts:
         until = datetime.fromisoformat(parts["UNTIL"])
-        until = until.replace(tzinfo=UTC) if until.tzinfo is None else until
+        until = until.replace(tzinfo=UTC) if until.tzinfo is None else until.astimezone(UTC)
     else:
         until = end
     if starts.tzinfo is None:
         starts = starts.replace(tzinfo=UTC)
-    if until.tzinfo is None:
-        until = until.replace(tzinfo=UTC)
     if start.tzinfo is None:
         start = start.replace(tzinfo=UTC)
     if end.tzinfo is None:
         end = end.replace(tzinfo=UTC)
+    if cutoff is not None:
+        cutoff = cutoff.replace(tzinfo=UTC) if cutoff.tzinfo is None else cutoff.astimezone(UTC)
+        until = min(until, cutoff)
+    if until.tzinfo is None:
+        until = until.replace(tzinfo=UTC)
     result = []
     cursor = starts
     emitted = 0