diff --git a/Makefile b/Makefile
index cc24462f..90e2a591 100644
--- a/Makefile
+++ b/Makefile
@@ -3,13 +3,13 @@
 PROTOC_VERSION := 3.17.2
 PROTOC_RELEASE := https://github.com/protocolbuffers/protobuf/releases
 PROTOC_URL := $(PROTOC_RELEASE)/download/v$(PROTOC_VERSION)/
-PROTO_FILES := $(shell find . -name "*.proto" -type f)
+PROTO_FILES := $(shell find server -name "*.proto" -type f)
+PROTO_THIRDPARTY_FILES := $(shell find thirdparty -name "*.proto" -type f)
 UNAME := $(shell uname)
 
 PROTOC_ZIP_MACOS := protoc-$(PROTOC_VERSION)-osx-x86_64.zip
 PROTOC_ZIP_LINUX := protoc-$(PROTOC_VERSION)-linux-x86_64.zip
 PROTOC_ZIP_WINDOWS := protoc-$(PROTOC_VERSION)-win64.zip
-
 ifeq ($(UNAME),Darwin)
 	PROTOC_FULL_URL := $(PROTOC_URL)/$(PROTOC_ZIP_MACOS)
 	PROTOC_FILE := $(PROTOC_ZIP_MACOS)
@@ -21,6 +21,8 @@ else ifeq ($(UNAME), Windows)
 	PROTOC_FILE := $(PROTOC_ZIP_WINDOWS)
 endif
 
+DART_MOCK_FILES := $(shell find client -name "*.mocks.dart" -type f)
+
 .PHONY: install
 install:
 	curl -OL $(PROTOC_FULL_URL)
@@ -38,6 +40,7 @@ gen.go:
 	mkdir -p ./server/pkg/protos/
 	protoc \
 	--proto_path=server \
+	--proto_path=thirdparty \
 	--go_out=server \
 	--go_opt=paths=source_relative \
 	--go-grpc_out=server \
@@ -46,18 +49,22 @@ gen.go:
 
 .PHONY: gen.dart
 gen.dart:
-	mkdir -p ./client/lib/protos/ && \
-		protoc \
-			--proto_path=server \
-			--dart_out=grpc:./client/lib/protos \
-			$(PROTO_FILES)
+	mkdir -p ./client/lib/protos/
+	protoc \
+	--proto_path=server \
+	--proto_path=thirdparty \
+	--dart_out=grpc:./client/lib/protos \
+	$(PROTO_FILES) $(PROTO_THIRDPARTY_FILES)
 
 .PHONY: test
 test: test.go test.dart
 
 .PHONY: test.dart
-test.dart:
-	cd client && flutter pub run build_runner build && flutter analyze && flutter test
+test.dart: $(DART_MOCK_FILES)
+	cd client && flutter analyze && flutter test
+
+$(DART_MOCK_FILES): $(DART_MOCK_FILES:.mocks.dart=.dart)
+	cd client && flutter pub run build_runner build
 
 .PHONY: test.dart-e2e
 test.dart-e2e:
diff --git a/client/lib/protos/google/protobuf/timestamp.pb.dart b/client/lib/protos/google/protobuf/timestamp.pb.dart
new file mode 100644
index 00000000..e5ed493f
--- /dev/null
+++ b/client/lib/protos/google/protobuf/timestamp.pb.dart
@@ -0,0 +1,83 @@
+///
+//  Generated code. Do not modify.
+//  source: google/protobuf/timestamp.proto
+//
+// @dart = 2.12
+// ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields
+
+import 'dart:core' as $core;
+
+import 'package:fixnum/fixnum.dart' as $fixnum;
+import 'package:protobuf/protobuf.dart' as $pb;
+
+import 'package:protobuf/src/protobuf/mixins/well_known.dart' as $mixin;
+
+class Timestamp extends $pb.GeneratedMessage with $mixin.TimestampMixin {
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'Timestamp', package: const $pb.PackageName(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'google.protobuf'), createEmptyInstance: create, toProto3Json: $mixin.TimestampMixin.toProto3JsonHelper, fromProto3Json: $mixin.TimestampMixin.fromProto3JsonHelper)
+    ..aInt64(1, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'seconds')
+    ..a<$core.int>(2, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'nanos', $pb.PbFieldType.O3)
+    ..hasRequiredFields = false
+  ;
+
+  Timestamp._() : super();
+  factory Timestamp({
+    $fixnum.Int64? seconds,
+    $core.int? nanos,
+  }) {
+    final _result = create();
+    if (seconds != null) {
+      _result.seconds = seconds;
+    }
+    if (nanos != null) {
+      _result.nanos = nanos;
+    }
+    return _result;
+  }
+  factory Timestamp.fromBuffer($core.List<$core.int> i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromBuffer(i, r);
+  factory Timestamp.fromJson($core.String i, [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) => create()..mergeFromJson(i, r);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.deepCopy] instead. '
+  'Will be removed in next major version')
+  Timestamp clone() => Timestamp()..mergeFromMessage(this);
+  @$core.Deprecated(
+  'Using this can add significant overhead to your binary. '
+  'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
+  'Will be removed in next major version')
+  Timestamp copyWith(void Function(Timestamp) updates) => super.copyWith((message) => updates(message as Timestamp)) as Timestamp; // ignore: deprecated_member_use
+  $pb.BuilderInfo get info_ => _i;
+  @$core.pragma('dart2js:noInline')
+  static Timestamp create() => Timestamp._();
+  Timestamp createEmptyInstance() => create();
+  static $pb.PbList<Timestamp> createRepeated() => $pb.PbList<Timestamp>();
+  @$core.pragma('dart2js:noInline')
+  static Timestamp getDefault() => _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<Timestamp>(create);
+  static Timestamp? _defaultInstance;
+
+  @$pb.TagNumber(1)
+  $fixnum.Int64 get seconds => $_getI64(0);
+  @$pb.TagNumber(1)
+  set seconds($fixnum.Int64 v) { $_setInt64(0, v); }
+  @$pb.TagNumber(1)
+  $core.bool hasSeconds() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearSeconds() => clearField(1);
+
+  @$pb.TagNumber(2)
+  $core.int get nanos => $_getIZ(1);
+  @$pb.TagNumber(2)
+  set nanos($core.int v) { $_setSignedInt32(1, v); }
+  @$pb.TagNumber(2)
+  $core.bool hasNanos() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearNanos() => clearField(2);
+  /// Creates a new instance from [dateTime].
+  ///
+  /// Time zone information will not be preserved.
+  static Timestamp fromDateTime($core.DateTime dateTime) {
+    final result = create();
+    $mixin.TimestampMixin.setFromDateTime(result, dateTime);
+    return result;
+  }
+}
+
diff --git a/client/lib/protos/google/protobuf/timestamp.pbenum.dart b/client/lib/protos/google/protobuf/timestamp.pbenum.dart
new file mode 100644
index 00000000..72b1ec68
--- /dev/null
+++ b/client/lib/protos/google/protobuf/timestamp.pbenum.dart
@@ -0,0 +1,7 @@
+///
+//  Generated code. Do not modify.
+//  source: google/protobuf/timestamp.proto
+//
+// @dart = 2.12
+// ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields
+
diff --git a/client/lib/protos/google/protobuf/timestamp.pbjson.dart b/client/lib/protos/google/protobuf/timestamp.pbjson.dart
new file mode 100644
index 00000000..d031fbfc
--- /dev/null
+++ b/client/lib/protos/google/protobuf/timestamp.pbjson.dart
@@ -0,0 +1,21 @@
+///
+//  Generated code. Do not modify.
+//  source: google/protobuf/timestamp.proto
+//
+// @dart = 2.12
+// ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields,deprecated_member_use_from_same_package
+
+import 'dart:core' as $core;
+import 'dart:convert' as $convert;
+import 'dart:typed_data' as $typed_data;
+@$core.Deprecated('Use timestampDescriptor instead')
+const Timestamp$json = const {
+  '1': 'Timestamp',
+  '2': const [
+    const {'1': 'seconds', '3': 1, '4': 1, '5': 3, '10': 'seconds'},
+    const {'1': 'nanos', '3': 2, '4': 1, '5': 5, '10': 'nanos'},
+  ],
+};
+
+/// Descriptor for `Timestamp`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List timestampDescriptor = $convert.base64Decode('CglUaW1lc3RhbXASGAoHc2Vjb25kcxgBIAEoA1IHc2Vjb25kcxIUCgVuYW5vcxgCIAEoBVIFbmFub3M=');
diff --git a/client/lib/protos/pkg/pr12er/messages.pb.dart b/client/lib/protos/pkg/pr12er/messages.pb.dart
index dd6719f5..462b0eed 100644
--- a/client/lib/protos/pkg/pr12er/messages.pb.dart
+++ b/client/lib/protos/pkg/pr12er/messages.pb.dart
@@ -9,6 +9,8 @@ import 'dart:core' as $core;
 
 import 'package:protobuf/protobuf.dart' as $pb;
 
+import '../../google/protobuf/timestamp.pb.dart' as $1;
+
 import 'messages.pbenum.dart';
 
 export 'messages.pbenum.dart';
@@ -23,7 +25,7 @@ class Video extends $pb.GeneratedMessage {
     ..a<$core.int>(6, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'numberOfLike', $pb.PbFieldType.O3)
     ..pPS(7, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'keywords')
     ..a<$core.int>(8, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'numberOfViews', $pb.PbFieldType.O3)
-    ..aOS(9, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'publishedDate')
+    ..aOM<$1.Timestamp>(9, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'publishedDate', subBuilder: $1.Timestamp.create)
     ..hasRequiredFields = false
   ;
 
@@ -37,7 +39,7 @@ class Video extends $pb.GeneratedMessage {
     $core.int? numberOfLike,
     $core.Iterable<$core.String>? keywords,
     $core.int? numberOfViews,
-    $core.String? publishedDate,
+    $1.Timestamp? publishedDate,
   }) {
     final _result = create();
     if (id != null) {
@@ -157,13 +159,15 @@ class Video extends $pb.GeneratedMessage {
   void clearNumberOfViews() => clearField(8);
 
   @$pb.TagNumber(9)
-  $core.String get publishedDate => $_getSZ(8);
+  $1.Timestamp get publishedDate => $_getN(8);
   @$pb.TagNumber(9)
-  set publishedDate($core.String v) { $_setString(8, v); }
+  set publishedDate($1.Timestamp v) { setField(9, v); }
   @$pb.TagNumber(9)
   $core.bool hasPublishedDate() => $_has(8);
   @$pb.TagNumber(9)
   void clearPublishedDate() => clearField(9);
+  @$pb.TagNumber(9)
+  $1.Timestamp ensurePublishedDate() => $_ensure(8);
 }
 
 class Detail extends $pb.GeneratedMessage {
diff --git a/client/lib/protos/pkg/pr12er/messages.pbjson.dart b/client/lib/protos/pkg/pr12er/messages.pbjson.dart
index 27559156..3a300774 100644
--- a/client/lib/protos/pkg/pr12er/messages.pbjson.dart
+++ b/client/lib/protos/pkg/pr12er/messages.pbjson.dart
@@ -48,12 +48,12 @@ const Video$json = const {
     const {'1': 'number_of_like', '3': 6, '4': 1, '5': 5, '10': 'numberOfLike'},
     const {'1': 'keywords', '3': 7, '4': 3, '5': 9, '10': 'keywords'},
     const {'1': 'number_of_views', '3': 8, '4': 1, '5': 5, '10': 'numberOfViews'},
-    const {'1': 'published_date', '3': 9, '4': 1, '5': 9, '10': 'publishedDate'},
+    const {'1': 'published_date', '3': 9, '4': 1, '5': 11, '6': '.google.protobuf.Timestamp', '10': 'publishedDate'},
   ],
 };
 
 /// Descriptor for `Video`. Decode as a `google.protobuf.DescriptorProto`.
-final $typed_data.Uint8List videoDescriptor = $convert.base64Decode('CgVWaWRlbxIOCgJpZBgBIAEoBVICaWQSFAoFdGl0bGUYAiABKAlSBXRpdGxlEhIKBGxpbmsYAyABKAlSBGxpbmsSHAoJcHJlc2VudGVyGAQgASgJUglwcmVzZW50ZXISMAoIY2F0ZWdvcnkYBSABKA4yFC5wa2cucHIxMmVyLkNhdGVnb3J5UghjYXRlZ29yeRIkCg5udW1iZXJfb2ZfbGlrZRgGIAEoBVIMbnVtYmVyT2ZMaWtlEhoKCGtleXdvcmRzGAcgAygJUghrZXl3b3JkcxImCg9udW1iZXJfb2Zfdmlld3MYCCABKAVSDW51bWJlck9mVmlld3MSJQoOcHVibGlzaGVkX2RhdGUYCSABKAlSDXB1Ymxpc2hlZERhdGU=');
+final $typed_data.Uint8List videoDescriptor = $convert.base64Decode('CgVWaWRlbxIOCgJpZBgBIAEoBVICaWQSFAoFdGl0bGUYAiABKAlSBXRpdGxlEhIKBGxpbmsYAyABKAlSBGxpbmsSHAoJcHJlc2VudGVyGAQgASgJUglwcmVzZW50ZXISMAoIY2F0ZWdvcnkYBSABKA4yFC5wa2cucHIxMmVyLkNhdGVnb3J5UghjYXRlZ29yeRIkCg5udW1iZXJfb2ZfbGlrZRgGIAEoBVIMbnVtYmVyT2ZMaWtlEhoKCGtleXdvcmRzGAcgAygJUghrZXl3b3JkcxImCg9udW1iZXJfb2Zfdmlld3MYCCABKAVSDW51bWJlck9mVmlld3MSQQoOcHVibGlzaGVkX2RhdGUYCSABKAsyGi5nb29nbGUucHJvdG9idWYuVGltZXN0YW1wUg1wdWJsaXNoZWREYXRl');
 @$core.Deprecated('Use detailDescriptor instead')
 const Detail$json = const {
   '1': 'Detail',
diff --git a/client/lib/protos/pkg/pr12er/service.pb.dart b/client/lib/protos/pkg/pr12er/service.pb.dart
index 9480044a..082b5407 100644
--- a/client/lib/protos/pkg/pr12er/service.pb.dart
+++ b/client/lib/protos/pkg/pr12er/service.pb.dart
@@ -9,7 +9,7 @@ import 'dart:core' as $core;
 
 import 'package:protobuf/protobuf.dart' as $pb;
 
-import 'messages.pb.dart' as $1;
+import 'messages.pb.dart' as $2;
 
 class HelloRequest extends $pb.GeneratedMessage {
   static final $pb.BuilderInfo _i = $pb.BuilderInfo(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'HelloRequest', package: const $pb.PackageName(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'pkg.pr12er'), createEmptyInstance: create)
@@ -107,13 +107,13 @@ class HelloResponse extends $pb.GeneratedMessage {
 
 class GetVideosResponse extends $pb.GeneratedMessage {
   static final $pb.BuilderInfo _i = $pb.BuilderInfo(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'GetVideosResponse', package: const $pb.PackageName(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'pkg.pr12er'), createEmptyInstance: create)
-    ..pc<$1.Video>(1, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'videos', $pb.PbFieldType.PM, subBuilder: $1.Video.create)
+    ..pc<$2.Video>(1, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'videos', $pb.PbFieldType.PM, subBuilder: $2.Video.create)
     ..hasRequiredFields = false
   ;
 
   GetVideosResponse._() : super();
   factory GetVideosResponse({
-    $core.Iterable<$1.Video>? videos,
+    $core.Iterable<$2.Video>? videos,
   }) {
     final _result = create();
     if (videos != null) {
@@ -143,7 +143,7 @@ class GetVideosResponse extends $pb.GeneratedMessage {
   static GetVideosResponse? _defaultInstance;
 
   @$pb.TagNumber(1)
-  $core.List<$1.Video> get videos => $_getList(0);
+  $core.List<$2.Video> get videos => $_getList(0);
 }
 
 class GetVideosRequest extends $pb.GeneratedMessage {
@@ -177,13 +177,13 @@ class GetVideosRequest extends $pb.GeneratedMessage {
 
 class GetDetailsResponse extends $pb.GeneratedMessage {
   static final $pb.BuilderInfo _i = $pb.BuilderInfo(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'GetDetailsResponse', package: const $pb.PackageName(const $core.bool.fromEnvironment('protobuf.omit_message_names') ? '' : 'pkg.pr12er'), createEmptyInstance: create)
-    ..aOM<$1.Detail>(1, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'detail', subBuilder: $1.Detail.create)
+    ..aOM<$2.Detail>(1, const $core.bool.fromEnvironment('protobuf.omit_field_names') ? '' : 'detail', subBuilder: $2.Detail.create)
     ..hasRequiredFields = false
   ;
 
   GetDetailsResponse._() : super();
   factory GetDetailsResponse({
-    $1.Detail? detail,
+    $2.Detail? detail,
   }) {
     final _result = create();
     if (detail != null) {
@@ -213,15 +213,15 @@ class GetDetailsResponse extends $pb.GeneratedMessage {
   static GetDetailsResponse? _defaultInstance;
 
   @$pb.TagNumber(1)
-  $1.Detail get detail => $_getN(0);
+  $2.Detail get detail => $_getN(0);
   @$pb.TagNumber(1)
-  set detail($1.Detail v) { setField(1, v); }
+  set detail($2.Detail v) { setField(1, v); }
   @$pb.TagNumber(1)
   $core.bool hasDetail() => $_has(0);
   @$pb.TagNumber(1)
   void clearDetail() => clearField(1);
   @$pb.TagNumber(1)
-  $1.Detail ensureDetail() => $_ensure(0);
+  $2.Detail ensureDetail() => $_ensure(0);
 }
 
 class GetDetailsRequest extends $pb.GeneratedMessage {
diff --git a/client/lib/widgets/detail/header.dart b/client/lib/widgets/detail/header.dart
index 321e35a0..18e2b96a 100644
--- a/client/lib/widgets/detail/header.dart
+++ b/client/lib/widgets/detail/header.dart
@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
 import 'package:pr12er/protos/pkg/pr12er/messages.pb.dart';
 
 // ignore: must_be_immutable
@@ -62,7 +63,8 @@ class HeaderWidget extends StatelessWidget {
     return [
       const Icon(Icons.today),
       const SizedBox(width: 8),
-      Text(video.publishedDate, style: const TextStyle(fontSize: 18))
+      Text(DateFormat.yMd().format(video.publishedDate.toDateTime()),
+          style: const TextStyle(fontSize: 18))
     ];
   }
 }
diff --git a/client/pubspec.lock b/client/pubspec.lock
index b5c9ad1a..69c81d24 100644
--- a/client/pubspec.lock
+++ b/client/pubspec.lock
@@ -301,6 +301,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "4.0.0"
+  intl:
+    dependency: "direct main"
+    description:
+      name: intl
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.17.0"
   io:
     dependency: transitive
     description:
diff --git a/client/pubspec.yaml b/client/pubspec.yaml
index 5ec2fbf8..34e406b0 100644
--- a/client/pubspec.yaml
+++ b/client/pubspec.yaml
@@ -26,6 +26,7 @@ dependencies:
   flutter:
     sdk: flutter
   grpc: ^3.0.0
+  intl: ^0.17.0
   protobuf: ^2.0.0
   provider: ^5.0.0
   youtube_player_flutter: ^8.0.0
diff --git a/server/pkg/pr12er/messages.pb.go b/server/pkg/pr12er/messages.pb.go
index 4544f4aa..bbbe5e41 100644
--- a/server/pkg/pr12er/messages.pb.go
+++ b/server/pkg/pr12er/messages.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.0
+// 	protoc        v3.17.1
 // source: pkg/pr12er/messages.proto
 
 package pr12er
@@ -9,6 +9,7 @@ package pr12er
 import (
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	timestamppb "google.golang.org/protobuf/types/known/timestamppb"
 	reflect "reflect"
 	sync "sync"
 )
@@ -135,15 +136,15 @@ type Video struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Id            int32    `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
-	Title         string   `protobuf:"bytes,2,opt,name=title,proto3" json:"title,omitempty"`
-	Link          string   `protobuf:"bytes,3,opt,name=link,proto3" json:"link,omitempty"`
-	Presenter     string   `protobuf:"bytes,4,opt,name=presenter,proto3" json:"presenter,omitempty"`
-	Category      Category `protobuf:"varint,5,opt,name=category,proto3,enum=pkg.pr12er.Category" json:"category,omitempty"`
-	NumberOfLike  int32    `protobuf:"varint,6,opt,name=number_of_like,json=numberOfLike,proto3" json:"number_of_like,omitempty"`
-	Keywords      []string `protobuf:"bytes,7,rep,name=keywords,proto3" json:"keywords,omitempty"`
-	NumberOfViews int32    `protobuf:"varint,8,opt,name=number_of_views,json=numberOfViews,proto3" json:"number_of_views,omitempty"`
-	PublishedDate string   `protobuf:"bytes,9,opt,name=published_date,json=publishedDate,proto3" json:"published_date,omitempty"`
+	Id            int32                  `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
+	Title         string                 `protobuf:"bytes,2,opt,name=title,proto3" json:"title,omitempty"`
+	Link          string                 `protobuf:"bytes,3,opt,name=link,proto3" json:"link,omitempty"`
+	Presenter     string                 `protobuf:"bytes,4,opt,name=presenter,proto3" json:"presenter,omitempty"`
+	Category      Category               `protobuf:"varint,5,opt,name=category,proto3,enum=pkg.pr12er.Category" json:"category,omitempty"`
+	NumberOfLike  int32                  `protobuf:"varint,6,opt,name=number_of_like,json=numberOfLike,proto3" json:"number_of_like,omitempty"`
+	Keywords      []string               `protobuf:"bytes,7,rep,name=keywords,proto3" json:"keywords,omitempty"`
+	NumberOfViews int32                  `protobuf:"varint,8,opt,name=number_of_views,json=numberOfViews,proto3" json:"number_of_views,omitempty"`
+	PublishedDate *timestamppb.Timestamp `protobuf:"bytes,9,opt,name=published_date,json=publishedDate,proto3" json:"published_date,omitempty"`
 }
 
 func (x *Video) Reset() {
@@ -234,11 +235,11 @@ func (x *Video) GetNumberOfViews() int32 {
 	return 0
 }
 
-func (x *Video) GetPublishedDate() string {
+func (x *Video) GetPublishedDate() *timestamppb.Timestamp {
 	if x != nil {
 		return x.PublishedDate
 	}
-	return ""
+	return nil
 }
 
 type Detail struct {
@@ -562,91 +563,95 @@ var File_pkg_pr12er_messages_proto protoreflect.FileDescriptor
 var file_pkg_pr12er_messages_proto_rawDesc = []byte{
 	0x0a, 0x19, 0x70, 0x6b, 0x67, 0x2f, 0x70, 0x72, 0x31, 0x32, 0x65, 0x72, 0x2f, 0x6d, 0x65, 0x73,
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+	0x54, 0x45, 0x47, 0x4f, 0x52, 0x59, 0x5f, 0x4f, 0x43, 0x52, 0x10, 0x03, 0x12, 0x12, 0x0a, 0x0e,
+	0x43, 0x41, 0x54, 0x45, 0x47, 0x4f, 0x52, 0x59, 0x5f, 0x41, 0x55, 0x44, 0x49, 0x4f, 0x10, 0x04,
+	0x12, 0x0f, 0x0a, 0x0b, 0x43, 0x41, 0x54, 0x45, 0x47, 0x4f, 0x52, 0x59, 0x5f, 0x52, 0x53, 0x10,
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+	0x45, 0x43, 0x49, 0x46, 0x49, 0x45, 0x44, 0x10, 0x00, 0x12, 0x18, 0x0a, 0x14, 0x46, 0x52, 0x41,
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+	0x57, 0x10, 0x01, 0x12, 0x15, 0x0a, 0x11, 0x46, 0x52, 0x41, 0x4d, 0x45, 0x57, 0x4f, 0x52, 0x4b,
+	0x5f, 0x50, 0x59, 0x54, 0x4f, 0x52, 0x43, 0x48, 0x10, 0x02, 0x12, 0x14, 0x0a, 0x10, 0x46, 0x52,
+	0x41, 0x4d, 0x45, 0x57, 0x4f, 0x52, 0x4b, 0x5f, 0x4f, 0x54, 0x48, 0x45, 0x52, 0x53, 0x10, 0x03,
+	0x42, 0x28, 0x5a, 0x26, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63,
+	0x6f, 0x64, 0x69, 0x6e, 0x67, 0x70, 0x6f, 0x74, 0x2f, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x2f,
+	0x70, 0x6b, 0x67, 0x2f, 0x70, 0x72, 0x31, 0x32, 0x65, 0x72, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74,
+	0x6f, 0x33,
 }
 
 var (
@@ -664,27 +669,29 @@ func file_pkg_pr12er_messages_proto_rawDescGZIP() []byte {
 var file_pkg_pr12er_messages_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
 var file_pkg_pr12er_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
 var file_pkg_pr12er_messages_proto_goTypes = []interface{}{
-	(Category)(0),      // 0: pkg.pr12er.Category
-	(Framework)(0),     // 1: pkg.pr12er.Framework
-	(*Video)(nil),      // 2: pkg.pr12er.Video
-	(*Detail)(nil),     // 3: pkg.pr12er.Detail
-	(*Paper)(nil),      // 4: pkg.pr12er.Paper
-	(*Repository)(nil), // 5: pkg.pr12er.Repository
-	(*Method)(nil),     // 6: pkg.pr12er.Method
+	(Category)(0),                 // 0: pkg.pr12er.Category
+	(Framework)(0),                // 1: pkg.pr12er.Framework
+	(*Video)(nil),                 // 2: pkg.pr12er.Video
+	(*Detail)(nil),                // 3: pkg.pr12er.Detail
+	(*Paper)(nil),                 // 4: pkg.pr12er.Paper
+	(*Repository)(nil),            // 5: pkg.pr12er.Repository
+	(*Method)(nil),                // 6: pkg.pr12er.Method
+	(*timestamppb.Timestamp)(nil), // 7: google.protobuf.Timestamp
 }
 var file_pkg_pr12er_messages_proto_depIdxs = []int32{
 	0, // 0: pkg.pr12er.Video.category:type_name -> pkg.pr12er.Category
-	4, // 1: pkg.pr12er.Detail.paper:type_name -> pkg.pr12er.Paper
-	4, // 2: pkg.pr12er.Detail.relevant_papers:type_name -> pkg.pr12er.Paper
-	4, // 3: pkg.pr12er.Detail.same_author_papers:type_name -> pkg.pr12er.Paper
-	5, // 4: pkg.pr12er.Paper.repositories:type_name -> pkg.pr12er.Repository
-	6, // 5: pkg.pr12er.Paper.methods:type_name -> pkg.pr12er.Method
-	1, // 6: pkg.pr12er.Repository.framework:type_name -> pkg.pr12er.Framework
-	7, // [7:7] is the sub-list for method output_type
-	7, // [7:7] is the sub-list for method input_type
-	7, // [7:7] is the sub-list for extension type_name
-	7, // [7:7] is the sub-list for extension extendee
-	0, // [0:7] is the sub-list for field type_name
+	7, // 1: pkg.pr12er.Video.published_date:type_name -> google.protobuf.Timestamp
+	4, // 2: pkg.pr12er.Detail.paper:type_name -> pkg.pr12er.Paper
+	4, // 3: pkg.pr12er.Detail.relevant_papers:type_name -> pkg.pr12er.Paper
+	4, // 4: pkg.pr12er.Detail.same_author_papers:type_name -> pkg.pr12er.Paper
+	5, // 5: pkg.pr12er.Paper.repositories:type_name -> pkg.pr12er.Repository
+	6, // 6: pkg.pr12er.Paper.methods:type_name -> pkg.pr12er.Method
+	1, // 7: pkg.pr12er.Repository.framework:type_name -> pkg.pr12er.Framework
+	8, // [8:8] is the sub-list for method output_type
+	8, // [8:8] is the sub-list for method input_type
+	8, // [8:8] is the sub-list for extension type_name
+	8, // [8:8] is the sub-list for extension extendee
+	0, // [0:8] is the sub-list for field type_name
 }
 
 func init() { file_pkg_pr12er_messages_proto_init() }
diff --git a/server/pkg/pr12er/messages.proto b/server/pkg/pr12er/messages.proto
index 72bdba7b..a87f1bbd 100644
--- a/server/pkg/pr12er/messages.proto
+++ b/server/pkg/pr12er/messages.proto
@@ -1,6 +1,8 @@
 syntax = "proto3";
 package pkg.pr12er;
 
+import "google/protobuf/timestamp.proto";
+
 option go_package = "github.com/codingpot/server/pkg/pr12er";
 
 enum Category {
@@ -28,7 +30,7 @@ message Video {
   int32 number_of_like = 6;
   repeated string keywords = 7;
   int32 number_of_views = 8;
-  string published_date = 9;
+  google.protobuf.Timestamp published_date = 9;
 }
 
 message Detail {
@@ -45,7 +47,7 @@ message Paper {
   string pub_date = 4;
   repeated string authors = 5;
   repeated Repository repositories = 6;
-  repeated Method methods = 7;  
+  repeated Method methods = 7;
 }
 
 message Repository {
@@ -61,4 +63,4 @@ message Method {
   string name = 1;
   string full_name = 2;
   string description = 3;
-}
+}
\ No newline at end of file
diff --git a/server/pkg/pr12er/metadata.pb.go b/server/pkg/pr12er/metadata.pb.go
index e643f456..72f3a4be 100644
--- a/server/pkg/pr12er/metadata.pb.go
+++ b/server/pkg/pr12er/metadata.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.0
+// 	protoc        v3.17.1
 // source: pkg/pr12er/metadata.proto
 
 package pr12er
diff --git a/server/pkg/pr12er/service.pb.go b/server/pkg/pr12er/service.pb.go
index 64715936..d54a3d88 100644
--- a/server/pkg/pr12er/service.pb.go
+++ b/server/pkg/pr12er/service.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.26.0
-// 	protoc        v3.17.0
+// 	protoc        v3.17.1
 // source: pkg/pr12er/service.proto
 
 package pr12er
diff --git a/thirdparty/google/protobuf/timestamp.proto b/thirdparty/google/protobuf/timestamp.proto
new file mode 100644
index 00000000..9c4c75cc
--- /dev/null
+++ b/thirdparty/google/protobuf/timestamp.proto
@@ -0,0 +1,147 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+package google.protobuf;
+
+option csharp_namespace = "Google.Protobuf.WellKnownTypes";
+option cc_enable_arenas = true;
+option go_package = "google.golang.org/protobuf/types/known/timestamppb";
+option java_package = "com.google.protobuf";
+option java_outer_classname = "TimestampProto";
+option java_multiple_files = true;
+option objc_class_prefix = "GPB";
+
+// A Timestamp represents a point in time independent of any time zone or local
+// calendar, encoded as a count of seconds and fractions of seconds at
+// nanosecond resolution. The count is relative to an epoch at UTC midnight on
+// January 1, 1970, in the proleptic Gregorian calendar which extends the
+// Gregorian calendar backwards to year one.
+//
+// All minutes are 60 seconds long. Leap seconds are "smeared" so that no leap
+// second table is needed for interpretation, using a [24-hour linear
+// smear](https://developers.google.com/time/smear).
+//
+// The range is from 0001-01-01T00:00:00Z to 9999-12-31T23:59:59.999999999Z. By
+// restricting to that range, we ensure that we can convert to and from [RFC
+// 3339](https://www.ietf.org/rfc/rfc3339.txt) date strings.
+//
+// # Examples
+//
+// Example 1: Compute Timestamp from POSIX `time()`.
+//
+//     Timestamp timestamp;
+//     timestamp.set_seconds(time(NULL));
+//     timestamp.set_nanos(0);
+//
+// Example 2: Compute Timestamp from POSIX `gettimeofday()`.
+//
+//     struct timeval tv;
+//     gettimeofday(&tv, NULL);
+//
+//     Timestamp timestamp;
+//     timestamp.set_seconds(tv.tv_sec);
+//     timestamp.set_nanos(tv.tv_usec * 1000);
+//
+// Example 3: Compute Timestamp from Win32 `GetSystemTimeAsFileTime()`.
+//
+//     FILETIME ft;
+//     GetSystemTimeAsFileTime(&ft);
+//     UINT64 ticks = (((UINT64)ft.dwHighDateTime) << 32) | ft.dwLowDateTime;
+//
+//     // A Windows tick is 100 nanoseconds. Windows epoch 1601-01-01T00:00:00Z
+//     // is 11644473600 seconds before Unix epoch 1970-01-01T00:00:00Z.
+//     Timestamp timestamp;
+//     timestamp.set_seconds((INT64) ((ticks / 10000000) - 11644473600LL));
+//     timestamp.set_nanos((INT32) ((ticks % 10000000) * 100));
+//
+// Example 4: Compute Timestamp from Java `System.currentTimeMillis()`.
+//
+//     long millis = System.currentTimeMillis();
+//
+//     Timestamp timestamp = Timestamp.newBuilder().setSeconds(millis / 1000)
+//         .setNanos((int) ((millis % 1000) * 1000000)).build();
+//
+//
+// Example 5: Compute Timestamp from Java `Instant.now()`.
+//
+//     Instant now = Instant.now();
+//
+//     Timestamp timestamp =
+//         Timestamp.newBuilder().setSeconds(now.getEpochSecond())
+//             .setNanos(now.getNano()).build();
+//
+//
+// Example 6: Compute Timestamp from current time in Python.
+//
+//     timestamp = Timestamp()
+//     timestamp.GetCurrentTime()
+//
+// # JSON Mapping
+//
+// In JSON format, the Timestamp type is encoded as a string in the
+// [RFC 3339](https://www.ietf.org/rfc/rfc3339.txt) format. That is, the
+// format is "{year}-{month}-{day}T{hour}:{min}:{sec}[.{frac_sec}]Z"
+// where {year} is always expressed using four digits while {month}, {day},
+// {hour}, {min}, and {sec} are zero-padded to two digits each. The fractional
+// seconds, which can go up to 9 digits (i.e. up to 1 nanosecond resolution),
+// are optional. The "Z" suffix indicates the timezone ("UTC"); the timezone
+// is required. A proto3 JSON serializer should always use UTC (as indicated by
+// "Z") when printing the Timestamp type and a proto3 JSON parser should be
+// able to accept both UTC and other timezones (as indicated by an offset).
+//
+// For example, "2017-01-15T01:30:15.01Z" encodes 15.01 seconds past
+// 01:30 UTC on January 15, 2017.
+//
+// In JavaScript, one can convert a Date object to this format using the
+// standard
+// [toISOString()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString)
+// method. In Python, a standard `datetime.datetime` object can be converted
+// to this format using
+// [`strftime`](https://docs.python.org/2/library/time.html#time.strftime) with
+// the time format spec '%Y-%m-%dT%H:%M:%S.%fZ'. Likewise, in Java, one can use
+// the Joda Time's [`ISODateTimeFormat.dateTime()`](
+// http://www.joda.org/joda-time/apidocs/org/joda/time/format/ISODateTimeFormat.html#dateTime%2D%2D
+// ) to obtain a formatter capable of generating timestamps in this format.
+//
+//
+message Timestamp {
+  // Represents seconds of UTC time since Unix epoch
+  // 1970-01-01T00:00:00Z. Must be from 0001-01-01T00:00:00Z to
+  // 9999-12-31T23:59:59Z inclusive.
+  int64 seconds = 1;
+
+  // Non-negative fractions of a second at nanosecond resolution. Negative
+  // second values with fractions must still have non-negative nanos values
+  // that count forward in time. Must be from 0 to 999,999,999
+  // inclusive.
+  int32 nanos = 2;
+}
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