diff --git a/src/integrations/calendar.js b/src/integrations/calendar.js
index 2b11518..5e99d4e 100644
--- a/src/integrations/calendar.js
+++ b/src/integrations/calendar.js
@@ -31,9 +31,10 @@ function run(argv) {
     const calendarName = String(calendar.name());
     if (input.calendarIndex !== null && c !== input.calendarIndex) continue;
     if (input.calendar && calendarName !== input.calendar) continue;
+    // Calendar's JXA bridge treats multi-property date tests inconsistently.
+    // Bound one indexed property here, then enforce overlap below.
     const events = calendar.events.whose({
-      startDate: {_lessThanEquals: end},
-      endDate: {_greaterThanEquals: start}
+      startDate: {_greaterThanEquals: start, _lessThanEquals: end}
     })();
     for (let e = 0; e < events.length; e++) {
       const event = events[e];