diff --git a/ui/litellm-dashboard/src/components/GuardrailsMonitor/LogViewer.test.tsx b/ui/litellm-dashboard/src/components/GuardrailsMonitor/LogViewer.test.tsx
new file mode 100644
index 00000000000..4eea35c8a87
--- /dev/null
+++ b/ui/litellm-dashboard/src/components/GuardrailsMonitor/LogViewer.test.tsx
@@ -0,0 +1,72 @@
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { fireEvent, render, screen, waitFor } from "@testing-library/react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import * as networking from "@/components/networking";
+import { LogViewer } from "./LogViewer";
+
+vi.mock("@/components/networking", () => ({
+  uiSpendLogsCall: vi.fn(),
+}));
+
+vi.mock("@/components/view_logs/LogDetailsDrawer", () => ({
+  LogDetailsDrawer: ({ open, logEntry }: { open: boolean; logEntry: { request_id: string } | null }) =>
+    open && logEntry ? <div data-testid="log-drawer">{logEntry.request_id}</div> : null,
+}));
+
+const mockUiSpendLogsCall = vi.mocked(networking.uiSpendLogsCall);
+
+const originalTimezone = process.env.TZ;
+
+function wrapper({ children }: { children: React.ReactNode }) {
+  const queryClient = new QueryClient({ defaultOptions: { queries: { retry: false } } });
+  return <QueryClientProvider client={queryClient}>{children}</QueryClientProvider>;
+}
+
+describe("LogViewer", () => {
+  beforeEach(() => {
+    // UTC+2: a day window built in the wrong order collapses onto the previous day
+    process.env.TZ = "Europe/Berlin";
+    mockUiSpendLogsCall.mockReset();
+  });
+
+  afterEach(() => {
+    process.env.TZ = originalTimezone;
+  });
+
+  it("should open the drawer for a log on the last day of the range in a UTC+ timezone", async () => {
+    mockUiSpendLogsCall.mockResolvedValue({
+      data: [{ request_id: "req-1" }],
+      total: 1,
+    });
+
+    render(
+      <LogViewer
+        guardrailName="Bedrock_Test"
+        logs={[
+          {
+            id: "req-1",
+            timestamp: "2026-07-22T09:38:46.397000+00:00",
+            action: "passed",
+            model: "model-router",
+            input_snippet: "hello",
+          },
+        ]}
+        totalLogs={1}
+        accessToken="sk-test"
+        startDate="2026-07-15"
+        endDate="2026-07-22"
+      />,
+      { wrapper },
+    );
+
+    fireEvent.click(screen.getByText("hello"));
+
+    await waitFor(() => expect(mockUiSpendLogsCall).toHaveBeenCalled());
+    const { start_date, end_date, params } = mockUiSpendLogsCall.mock.calls[0][0];
+    expect(params?.request_id).toBe("req-1");
+    expect(Date.parse(`${start_date}Z`)).toBeLessThanOrEqual(Date.parse("2026-07-22T09:38:46Z"));
+    expect(Date.parse(`${end_date}Z`)).toBeGreaterThanOrEqual(Date.parse("2026-07-22T09:38:46Z"));
+
+    expect(await screen.findByTestId("log-drawer")).toHaveTextContent("req-1");
+  });
+});
diff --git a/ui/litellm-dashboard/src/components/GuardrailsMonitor/LogViewer.tsx b/ui/litellm-dashboard/src/components/GuardrailsMonitor/LogViewer.tsx
index 8d073feae82..ef0f1c19154 100644
--- a/ui/litellm-dashboard/src/components/GuardrailsMonitor/LogViewer.tsx
+++ b/ui/litellm-dashboard/src/components/GuardrailsMonitor/LogViewer.tsx
@@ -69,10 +69,10 @@ export function LogViewer({
   const filters: Array<"all" | "blocked" | "flagged" | "passed"> = ["all", "blocked", "flagged", "passed"];
 
   const startTime = startDate
-    ? moment(startDate).utc().format("YYYY-MM-DD HH:mm:ss")
+    ? moment(startDate).startOf("day").utc().format("YYYY-MM-DD HH:mm:ss")
     : moment().subtract(24, "hours").utc().format("YYYY-MM-DD HH:mm:ss");
   const endTime = endDate
-    ? moment(endDate).utc().endOf("day").format("YYYY-MM-DD HH:mm:ss")
+    ? moment(endDate).endOf("day").utc().format("YYYY-MM-DD HH:mm:ss")
     : moment().utc().format("YYYY-MM-DD HH:mm:ss");
 
   const { data: fullLogResponse } = useQuery({