fix: UTC-Bug bei Datum-Defaults - new Date().toISOString() durch lokale Formatierung ersetzt

frontend/src/tools/bestellungen.jsx

@@ -45,7 +45,11 @@ function BestellungDetail({ id, toast, onBack }) {
   const [pickerSearch,setPickerSearch]= useState('');
   const [editMode,    setEditMode]    = useState(false);
   const [form,        setForm]        = useState({ name:'', bemerkung:'', custom_price:'', status:'warteliste' });
-  const today = () => new Date().toISOString().slice(0,10);
+  const today = () => {
+    const d = new Date();
+    const y = d.getFullYear(), m = String(d.getMonth()+1).padStart(2,'0'), day = String(d.getDate()).padStart(2,'0');
+    return `${y}-${m}-${day}`;
+  };
   const [bezahltDate,  setBezahltDate]  = useState(today());
   const [abgeholtDate, setAbgeholtDate] = useState(today());
   const [showBezahltPicker,  setShowBezahltPicker]  = useState(false);

frontend/src/tools/statistik.jsx

@@ -22,6 +22,13 @@ const CATS = ['Filament','Zubehör','Ersatzteile','Werkzeug','Sonstiges'];
 const CAT_COLORS = { Filament:'#4ecdc4', Zubehör:'#ffe66d', Ersatzteile:'#ff6b9d', Werkzeug:'#60a5fa', Sonstiges:'#c084fc' };
 
 const fmt = v => `${(v||0).toFixed(2)} €`;
+// Lokales Datum als YYYY-MM-DD (kein UTC-Bug wie bei toISOString)
+function todayLocal() {
+  const d = new Date();
+  const y = d.getFullYear(), m = String(d.getMonth()+1).padStart(2,'0'), day = String(d.getDate()).padStart(2,'0');
+  return `${y}-${m}-${day}`;
+}
+
 const fmtMonth = m => {
   if (!m) return '';
   if (/^\d{4}-\d{2}$/.test(m)) {
@@ -192,12 +199,12 @@ function OrdersInPeriod({ fromDate, toDate }) {
 
 export default function Statistik({ mobile }) {
   const [fromDate, setFromDate] = useState('');
-  const [toDate,   setToDate]   = useState(new Date().toISOString().slice(0,10));
+  const [toDate,   setToDate]   = useState(todayLocal());
   const [data,   setData]       = useState(null);
   const [loading,setLoading]    = useState(false);
   const [tab,    setTab]        = useState('overview');
 
-  const [expForm,setExpForm]    = useState({ date: new Date().toISOString().slice(0,10), category:'Filament', description:'', amount:'' });
+  const [expForm,setExpForm]    = useState({ date: todayLocal(), category:'Filament', description:'', amount:'' });
   const [saving, setSaving]     = useState(false);
 
   function load() {
@@ -251,7 +258,7 @@ export default function Statistik({ mobile }) {
                 borderRadius:8,padding:'5px 10px',color:'#fff',fontFamily:'monospace',fontSize:11,cursor:'pointer'}}/>
           </div>
           {fromDate && (
-            <button onClick={()=>{setFromDate('');setToDate(new Date().toISOString().slice(0,10));}}
+            <button onClick={()=>{setFromDate('');setToDate(todayLocal());}}
               style={{background:'rgba(255,255,255,0.04)',border:'1px solid rgba(255,255,255,0.1)',
                 borderRadius:8,padding:'5px 10px',color:'rgba(255,255,255,0.4)',fontFamily:'monospace',fontSize:11,cursor:'pointer'}}>
               ✕ Zurücksetzen