detail refactor

lib/views/detail/widgets/tender_detail_header.dart

@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
-import 'package:intl/intl.dart';
 import 'package:tm_app/core/theme/colors.dart';
+import 'package:tm_app/core/utils/date_utils.dart';
 import 'package:tm_app/core/utils/size_config.dart';
 import 'package:tm_app/data/services/model/tender_data/tender_data.dart';
 import 'package:tm_app/views/detail/widgets/status_tag.dart';
@@ -73,16 +73,3 @@ class TenderDetailHeader extends StatelessWidget {
     ),
   );
 }
-
-String unixToDate(int? unixTimestamp, {String format = 'yyyy-MM-dd'}) {
-  if (unixTimestamp == null) {
-    return '';
-  }
-
-  // Convert seconds to milliseconds if needed
-  int timestampInMs =
-      unixTimestamp > 1000000000000 ? unixTimestamp : unixTimestamp * 1000;
-
-  final DateTime dateTime = DateTime.fromMillisecondsSinceEpoch(timestampInMs);
-  return DateFormat(format).format(dateTime);
-}