diff --git a/posthog/hogql_queries/insights/lifecycle_query_runner.py b/posthog/hogql_queries/insights/lifecycle_query_runner.py
index a9eae1adebaa0..053882cc65635 100644
--- a/posthog/hogql_queries/insights/lifecycle_query_runner.py
+++ b/posthog/hogql_queries/insights/lifecycle_query_runner.py
@@ -126,7 +126,10 @@ def to_actors_query(
 
     def to_actors_query_options(self) -> InsightActorsQueryOptionsResponse:
         return InsightActorsQueryOptionsResponse(
-            day=[{"label": format_label_date(value), "value": value} for value in self.query_date_range.all_values()],
+            day=[
+                {"label": format_label_date(value), "value": value.isoformat().replace("+00:00", "Z")}
+                for value in self.query_date_range.all_values()
+            ],
             status=[
                 {
                     "label": "Dormant",