Added flutter front-end

frontend/lib/utils/friendly_date_formatter.dart

@@ -0,0 +1,25 @@
+import 'package:intl/intl.dart';
+
+class FriendlyDateFormatter {
+  FriendlyDateFormatter();
+
+  String format(DateTime dateTime) {
+    DateTime now = DateTime.now();
+    Duration timeSince = now.difference(dateTime);
+    DateTime today = DateTime(now.year, now.month, now.day);
+    DateTime yesterday = DateTime(now.year, now.month, now.day - 1);
+    DateTime dateTimeWithoutTime = DateTime(
+      dateTime.year,
+      dateTime.month,
+      dateTime.day,
+    );
+
+    if (timeSince.inMinutes < 60) return '${timeSince.inMinutes} minutes ago';
+    if (dateTimeWithoutTime == today)
+      return 'Today at ${DateFormat.Hm().format(dateTime)}';
+    if (dateTimeWithoutTime == yesterday)
+      return 'Yesterday at ${DateFormat.Hm().format(dateTime)}';
+
+    return DateFormat.yMMMMd().add_Hm().format(dateTime);
+  }
+}