Improve the inventory page 3

frontend/src/utils/date.ts

@@ -564,7 +564,7 @@ export const formatDateInTimezone = (
 ): string => {
   try {
     const dateObj = typeof date === 'string' ? parseISO(date) : date;
-    
+
     if (!isValid(dateObj)) {
       return '';
     }
@@ -580,4 +580,23 @@ export const formatDateInTimezone = (
   } catch {
     return formatDate(date, formatStr);
   }
+};
+
+// Convert HTML date input (YYYY-MM-DD) to end-of-day datetime for API
+export const formatExpirationDateForAPI = (dateString: string): string | undefined => {
+  try {
+    if (!dateString) return undefined;
+
+    // Parse the date string (YYYY-MM-DD format from HTML date input)
+    const dateObj = parseISO(dateString);
+
+    if (!isValid(dateObj)) {
+      return undefined;
+    }
+
+    // Set to end of day for expiration dates and return ISO string
+    return getEndOfDay(dateObj).toISOString();
+  } catch {
+    return undefined;
+  }
 };