fix(dates): use local 'today' for date-input defaults instead of the UTC date

11 form defaults across 6 files used new Date().toISOString().split('T')[0] (the UTC date), which lands on yesterday during the post-midnight Prague window (UTC+1/+2). Added todayLocalStr() (local YYYY-MM-DD) in formatters and replaced them. Future-date expressions (e.g. invoice due_date +14d) left untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/components/dashboard/DashQuickActions.tsx

@@ -3,7 +3,7 @@ import { Link } from "react-router-dom";
 import { motion, AnimatePresence } from "framer-motion";
 import { useAuth } from "../../context/AuthContext";
 import { useAlert } from "../../context/AlertContext";
-import { formatKm } from "../../utils/formatters";
+import { formatKm, todayLocalStr } from "../../utils/formatters";
 import AdminDatePicker from "../AdminDatePicker";
 import apiFetch from "../../utils/api";
 import useModalLock from "../../hooks/useModalLock";
@@ -74,7 +74,7 @@ export default function DashQuickActions({
   const openTripModal = async () => {
     setTripForm({
       vehicle_id: "",
-      trip_date: new Date().toISOString().split("T")[0],
+      trip_date: todayLocalStr(),
       start_km: "",
       end_km: "",
       route_from: "",

src/admin/pages/Attendance.tsx

@@ -17,7 +17,7 @@ import Forbidden from "../components/Forbidden";
 import apiFetch from "../utils/api";
 import { jsonQuery } from "../lib/apiAdapter";
 import { useApiMutation } from "../lib/queries/mutations";
-import { czechPlural } from "../utils/formatters";
+import { czechPlural, todayLocalStr } from "../utils/formatters";
 
 const API_BASE = "/api/admin";
 
@@ -140,8 +140,8 @@ export default function Attendance() {
   const [isLeaveModalOpen, setIsLeaveModalOpen] = useState(false);
   const [leaveForm, setLeaveForm] = useState({
     leave_type: "vacation",
-    date_from: new Date().toISOString().split("T")[0],
+    date_from: todayLocalStr(),
-    date_to: new Date().toISOString().split("T")[0],
+    date_to: todayLocalStr(),
     notes: "",
   });
   const [requestSubmitting, setRequestSubmitting] = useState(false);
@@ -334,8 +334,8 @@ export default function Attendance() {
       alert.success(result?.message || "Žádost odeslána");
       setLeaveForm({
         leave_type: "vacation",
-        date_from: new Date().toISOString().split("T")[0],
+        date_from: todayLocalStr(),
-        date_to: new Date().toISOString().split("T")[0],
+        date_to: todayLocalStr(),
         notes: "",
       });
     } catch (e) {

src/admin/pages/AttendanceCreate.tsx

@@ -10,6 +10,7 @@ import { motion } from "framer-motion";
 import AdminDatePicker from "../components/AdminDatePicker";
 import FormField from "../components/FormField";
 import { useApiMutation } from "../lib/queries/mutations";
+import { todayLocalStr } from "../utils/formatters";
 const API_BASE = "/api/admin";
 
 interface CreateForm {
@@ -46,7 +47,7 @@ export default function AttendanceCreate() {
   });
 
   const [form, setForm] = useState<CreateForm>(() => {
-    const today = new Date().toISOString().split("T")[0];
+    const today = todayLocalStr();
     return {
       user_id: "",
       shift_date: today,

src/admin/pages/InvoiceDetail.tsx

@@ -48,7 +48,7 @@ import {
 import { offerCustomersOptions, type Customer } from "../lib/queries/offers";
 import { bankAccountsOptions, type BankAccount } from "../lib/queries/common";
 import { jsonQuery } from "../lib/apiAdapter";
-import { formatCurrency, formatDate } from "../utils/formatters";
+import { formatCurrency, formatDate, todayLocalStr } from "../utils/formatters";
 
 const API_BASE = "/api/admin";
 
@@ -326,9 +326,9 @@ export default function InvoiceDetail() {
     customer_id: null,
     customer_name: "",
     order_id: fromOrderId ? Number(fromOrderId) : null,
-    issue_date: new Date().toISOString().split("T")[0],
+    issue_date: todayLocalStr(),
     due_date: new Date(Date.now() + 14 * 86400000).toISOString().split("T")[0],
-    tax_date: new Date().toISOString().split("T")[0],
+    tax_date: todayLocalStr(),
     currency: "CZK",
     apply_vat: 1,
     vat_rate: 21,

src/admin/pages/OfferDetail.tsx

@@ -56,7 +56,7 @@ import AdminDatePicker from "../components/AdminDatePicker";
 import RichEditor from "../components/RichEditor";
 import useDebounce from "../hooks/useDebounce";
 import apiFetch from "../utils/api";
-import { formatCurrency } from "../utils/formatters";
+import { formatCurrency, todayLocalStr } from "../utils/formatters";
 import {
   companySettingsOptions,
   type CompanySettingsData,
@@ -101,7 +101,7 @@ const emptyForm: OfferForm = {
   project_code: "",
   customer_id: null,
   customer_name: "",
-  created_at: new Date().toISOString().split("T")[0],
+  created_at: todayLocalStr(),
   valid_until: "",
   currency: "CZK",
   language: "EN",

src/admin/pages/Trips.tsx

@@ -11,7 +11,7 @@ import FormModal from "../components/FormModal";
 import FormField from "../components/FormField";
 import Forbidden from "../components/Forbidden";
 import { formatDate } from "../utils/attendanceHelpers";
-import { formatKm } from "../utils/formatters";
+import { formatKm, todayLocalStr } from "../utils/formatters";
 import apiFetch from "../utils/api";
 import {
   tripListOptions,
@@ -53,7 +53,7 @@ export default function Trips() {
   }>({ show: false, tripId: null });
   const [form, setForm] = useState<TripForm>({
     vehicle_id: "",
-    trip_date: new Date().toISOString().split("T")[0],
+    trip_date: todayLocalStr(),
     start_km: "",
     end_km: "",
     route_from: "",
@@ -117,10 +117,9 @@ export default function Trips() {
 
   const openCreateModal = () => {
     setEditingTrip(null);
-    const today = new Date().toISOString().split("T")[0];
     setForm({
       vehicle_id: "",
-      trip_date: today,
+      trip_date: todayLocalStr(),
       start_km: "",
       end_km: "",
       route_from: "",

src/admin/utils/formatters.ts

@@ -23,6 +23,19 @@ export function formatDate(dateStr: string | null | undefined): string {
   return d.toLocaleDateString("cs-CZ");
 }
 
+/**
+ * Today's date as `YYYY-MM-DD` in LOCAL (Prague) time — use this for
+ * date-input defaults. `new Date().toISOString().slice(0, 10)` gives the UTC
+ * date, which is a day behind the Czech date during the post-midnight window
+ * (Prague is UTC+1/+2), so a "today" default could land on yesterday.
+ */
+export function todayLocalStr(): string {
+  const d = new Date();
+  const m = String(d.getMonth() + 1).padStart(2, "0");
+  const day = String(d.getDate()).padStart(2, "0");
+  return `${d.getFullYear()}-${m}-${day}`;
+}
+
 export function formatKm(km: number | string): string {
   return new Intl.NumberFormat("cs-CZ").format(Number(km) || 0);
 }