fix

public/js/modals/email-modal.js

@@ -43,16 +43,20 @@ function parseLocalDate(dateValue) {
     return Number.isNaN(d.getTime()) ? null : d;
 }
 
-function getLastSentDate(invoice) {
+function getFirstSentDate(invoice) {
     const sentDates = Array.isArray(invoice.sent_dates)
         ? invoice.sent_dates.filter(Boolean)
         : [];
 
-    if (sentDates.length > 0) {
-        return sentDates[sentDates.length - 1];
+    if (sentDates.length === 0) {
+        return null;
     }
 
-    return null;
+    const sortedDates = sentDates
+        .map(d => String(d).split('T')[0])
+        .sort();
+
+    return sortedDates[0];
 }
 
 function getTermDays(invoice) {
@@ -79,18 +83,13 @@ function addDays(dateValue, days) {
 }
 
 function getEffectiveDueDate(invoice) {
-    const lastSentDate = getLastSentDate(invoice);
+    const firstSentDate = getFirstSentDate(invoice);
 
-    // Nie versendet = kein Reminder/Overdue Text
-    if (!lastSentDate) {
+    if (!firstSentDate) {
         return null;
     }
 
-    if (invoice.due_date) {
-        return parseLocalDate(invoice.due_date);
-    }
-
-    return addDays(lastSentDate, getTermDays(invoice));
+    return addDays(firstSentDate, getTermDays(invoice));
 }
 
 function getOverdueDays(invoice) {

public/js/views/invoice-view.js

@@ -87,14 +87,22 @@ function isPartiallyPaid(inv) {
     return !inv.paid_date && amountPaid > 0 && balance > 0;
 }
 
-function getLastSentDate(inv) {
-    const sentDates = Array.isArray(inv.sent_dates) ? inv.sent_dates.filter(Boolean) : [];
+function getFirstSentDate(inv) {
+    const sentDates = Array.isArray(inv.sent_dates)
+        ? inv.sent_dates.filter(Boolean)
+        : [];
 
-    if (sentDates.length > 0) {
-        return sentDates[sentDates.length - 1];
+    if (sentDates.length === 0) {
+        return null;
     }
 
-    return null;
+    // Sicherheit: nicht auf Array-Reihenfolge verlassen,
+    // sondern wirklich das früheste Versanddatum nehmen.
+    const sortedDates = sentDates
+        .map(d => String(d).split('T')[0])
+        .sort();
+
+    return sortedDates[0];
 }
 
 function getTermDays(inv) {
@@ -132,22 +140,18 @@ function isBeforeToday(dateObj) {
 
     return compare < today;
 }
-
 function getEffectiveDueDate(inv) {
-    const lastSentDate = getLastSentDate(inv);
+    const firstSentDate = getFirstSentDate(inv);
 
-    // Wichtig: Nie versendete Rechnungen können nicht overdue sein.
-    if (!lastSentDate) {
+    // Nie versendet = nicht overdue
+    if (!firstSentDate) {
         return null;
     }
 
-    // Wenn due_date vorhanden ist, darf es genutzt werden,
-    // aber nur nachdem die Rechnung tatsächlich gesendet wurde.
-    if (inv.due_date) {
-        return parseLocalDate(inv.due_date);
-    }
-
-    return addDays(lastSentDate, getTermDays(inv));
+    // WICHTIG:
+    // Für Overdue zählt der erste tatsächliche Versand.
+    // Bei Net 30 also first_sent_date + 30 Tage.
+    return addDays(firstSentDate, getTermDays(inv));
 }
 
 function getOverdueDays(inv) {
@@ -166,7 +170,7 @@ function isOverdue(inv) {
     return !!inv.qbo_id
         && !isPaid(inv)
         && !isPartiallyPaid(inv)
-        && !!getLastSentDate(inv)
+        && !!getFirstSentDate(inv)
         && isBeforeToday(getEffectiveDueDate(inv));
 }