Improve timestamp handling and event navigation

web/Dockerfile

@@ -13,7 +13,9 @@ FROM node:22-alpine AS runner
 WORKDIR /app
 ENV NODE_ENV=production \
     PORT=3000 \
-    HOSTNAME=0.0.0.0
+    HOSTNAME=0.0.0.0 \
+    MONLET_WEB_TIME_ZONE=UTC \
+    TZ=UTC
 COPY --from=builder /app/.next ./.next
 COPY --from=builder /app/public ./public
 COPY --from=builder /app/node_modules ./node_modules