add structure

lib/util.dart

@@ -0,0 +1,27 @@
+import 'package:cloud_firestore/cloud_firestore.dart';
+import 'package:intl/intl.dart';
+
+class DateUtil {
+  static DateTime toLocal(DateTime dt) {
+    return dt.add(Duration(hours: 6, minutes: 30));
+  }
+
+  static DateTime fromTimestampToLocalDate(Timestamp ts) {
+    if (ts == null) return null;
+    return toLocal(ts.toDate());
+  }
+}
+
+String updatePhoneNumber(String phoneNumber) {
+  if(phoneNumber==null) return null;
+  if (phoneNumber.startsWith("09")) {
+    return "959" + phoneNumber.substring(2);
+  }
+  return phoneNumber;
+}
+
+final NumberFormat numberFormatter = new NumberFormat("#,###");
+String formatNumber(int number) {
+  if (number == null) return "";
+  return numberFormatter.format(number);
+}