diff --git a/frontend/src/components/analytics/TrendBarChart.tsx b/frontend/src/components/analytics/TrendBarChart.tsx
index 1e3eecf..73fdb1e 100644
--- a/frontend/src/components/analytics/TrendBarChart.tsx
+++ b/frontend/src/components/analytics/TrendBarChart.tsx
@@ -1,10 +1,10 @@
 import { AnalyticsRange, AnalyticsTrendPoint } from "@/types";
-import { formatCurrency } from "@/lib/utils";
+import { formatCurrency, parseUtcTimestamp } from "@/lib/utils";
 import { Card } from "../ui/card";
 
 const formatAxisLabel = (value: string, range: AnalyticsRange): string => {
-  const date = new Date(value);
-  if (Number.isNaN(date.getTime())) {
+  const date = parseUtcTimestamp(value);
+  if (!date) {
     return value;
   }
 
diff --git a/frontend/src/lib/utils.ts b/frontend/src/lib/utils.ts
index 6850c0d..6ce6dff 100644
--- a/frontend/src/lib/utils.ts
+++ b/frontend/src/lib/utils.ts
@@ -5,6 +5,25 @@ export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs))
 }
 
+const TIMESTAMP_TIMEZONE_PATTERN = /(Z|[+-]\d{2}:\d{2})$/i
+
+export function parseUtcTimestamp(value: string): Date | null {
+  const rawValue = value.trim()
+  if (!rawValue) {
+    return null
+  }
+
+  const normalizedValue = rawValue.includes('T')
+    ? rawValue
+    : rawValue.replace(' ', 'T')
+  const candidate = TIMESTAMP_TIMEZONE_PATTERN.test(normalizedValue)
+    ? normalizedValue
+    : `${normalizedValue}Z`
+  const date = new Date(candidate)
+
+  return Number.isNaN(date.getTime()) ? null : date
+}
+
 export function formatCurrency(value: number): string {
   return `$${(value / 1000000).toFixed(2)}`
 }
diff --git a/frontend/src/pages/UsageLogs.tsx b/frontend/src/pages/UsageLogs.tsx
index c6a2d38..53704fe 100644
--- a/frontend/src/pages/UsageLogs.tsx
+++ b/frontend/src/pages/UsageLogs.tsx
@@ -10,7 +10,7 @@ import { Dialog, DialogContent, DialogDescription, DialogHeader, DialogTitle } f
 import { Input } from "@/components/ui/input";
 import { Select } from "@/components/ui/select";
 import { readScopedCache, writeScopedCache } from "@/lib/local-cache";
-import { cn, formatCurrency } from "@/lib/utils";
+import { cn, formatCurrency, parseUtcTimestamp } from "@/lib/utils";
 import { Eye, RefreshCw, RotateCcw, Search } from "lucide-react";
 
 type UsageLogFilterState = {
@@ -89,8 +89,8 @@ const hydrateUsageLogFilters = (
 };
 
 const formatDateTime = (value: string): string => {
-  const date = new Date(value);
-  if (Number.isNaN(date.getTime())) {
+  const date = parseUtcTimestamp(value);
+  if (!date) {
     return value;
   }
 
diff --git a/src/analytics/query.ts b/src/analytics/query.ts
index ee5b033..f04d75b 100644
--- a/src/analytics/query.ts
+++ b/src/analytics/query.ts
@@ -235,6 +235,25 @@ const toText = (value: unknown): string => {
     return typeof value === "string" ? value : "";
 };
 
+const TIMESTAMP_TIMEZONE_PATTERN = /(Z|[+-]\d{2}:\d{2})$/i;
+
+const normalizeAnalyticsTimestamp = (value: unknown): string => {
+    const rawValue = toText(value).trim();
+    if (!rawValue) {
+        return "";
+    }
+
+    const normalizedValue = rawValue.includes("T")
+        ? rawValue
+        : rawValue.replace(" ", "T");
+    const candidate = TIMESTAMP_TIMEZONE_PATTERN.test(normalizedValue)
+        ? normalizedValue
+        : `${normalizedValue}Z`;
+    const date = new Date(candidate);
+
+    return Number.isNaN(date.getTime()) ? rawValue : date.toISOString();
+};
+
 const escapeSqlString = (value: string): string => {
     return value.replace(/'/g, "''");
 };
@@ -785,7 +804,7 @@ LIMIT ${limit}
         sampled: true,
         compatibilityWarning,
         items: rows.map((row) => ({
-            timestamp: toText(row.timestamp),
+            timestamp: normalizeAnalyticsTimestamp(row.timestamp),
             routeId: toText(row.route_id),
             tokenName: toText(row.token_name),
             channelKey: toText(row.channel_key),
@@ -970,7 +989,7 @@ OFFSET ${offset}
         hasPrevPage: totalPages > 0 && page > 1,
         hasNextPage: totalPages > 0 && page < totalPages,
         items: rows.map((row) => ({
-            timestamp: toText(row.timestamp),
+            timestamp: normalizeAnalyticsTimestamp(row.timestamp),
             routeId: toText(row.route_id),
             tokenName: toText(row.token_name),
             channelKey: toText(row.channel_key),