Added experimental option to display date when you joined to channel.

Telegram/Resources/langs/lang.strings

@@ -2221,6 +2221,8 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 "lng_you_paid_stars#one" = "You paid {count} Star.";
 "lng_you_paid_stars#other" = "You paid {count} Stars.";
 
+"lng_you_joined_group" = "You joined this group";
+
 "lng_similar_channels_title" = "Similar channels";
 "lng_similar_channels_view_all" = "View all";
 "lng_similar_channels_more" = "More Channels";

Telegram/SourceFiles/info/profile/info_profile_actions.cpp

@@ -113,6 +113,12 @@ base::options::toggle ShowPeerIdBelowAbout({
 		" Add contact IDs to exported data.",
 });
 
+base::options::toggle ShowChannelJoinedBelowAbout({
+	.id = kOptionShowChannelJoinedBelowAbout,
+	.name = "Show Channel Joined Date in Profile",
+	.description = "Show when you join Channel under its Description.",
+});
+
 [[nodiscard]] rpl::producer<TextWithEntities> UsernamesSubtext(
 		not_null<PeerData*> peer,
 		rpl::producer<QString> fallback) {
@@ -183,15 +189,13 @@ base::options::toggle ShowPeerIdBelowAbout({
 	return result;
 }
 
-[[nodiscard]] rpl::producer<TextWithEntities> AboutWithIdValue(
+[[nodiscard]] rpl::producer<TextWithEntities> AboutWithAdvancedValue(
 		not_null<PeerData*> peer) {
 
 	return AboutValue(
 		peer
 	) | rpl::map([=](TextWithEntities &&value) {
-		if (!ShowPeerIdBelowAbout.value()) {
-			return std::move(value);
-		}
+		if (ShowPeerIdBelowAbout.value()) {
 			using namespace Ui::Text;
 			if (!value.empty()) {
 				value.append("\n\n");
@@ -201,6 +205,31 @@ base::options::toggle ShowPeerIdBelowAbout({
 			value.append(Link(
 				Italic(Lang::FormatCountDecimal(raw)),
 				"internal:~peer_id~:copy:" + QString::number(raw)));
+		}
+		if (ShowChannelJoinedBelowAbout.value()) {
+			if (const auto channel = peer->asChannel()) {
+				if (!channel->amCreator() && channel->inviteDate) {
+					if (!value.empty()) {
+						if (ShowPeerIdBelowAbout.value()) {
+							value.append("\n");
+						} else {
+							value.append("\n\n");
+						}
+					}
+					using namespace Ui::Text;
+					value.append((channel->isMegagroup()
+						? tr::lng_you_joined_group
+						: tr::lng_action_you_joined)(
+							tr::now,
+							Ui::Text::Italic));
+					value.append(Italic(": "));
+					const auto raw = channel->inviteDate;
+					value.append(Link(
+						Italic(langDateTimeFull(base::unixtime::parse(raw))),
+						"internal:~join_date~:show:" + QString::number(raw)));
+				}
+			}
+		}
 		return std::move(value);
 	});
 }
@@ -1178,6 +1207,23 @@ object_ptr<Ui::RpWidget> DetailsFiller::setupInfo() {
 			return false;
 		} else if (SetClickContext<CashtagClickHandler>(handler, context)) {
 			return false;
+		} else if (handler->url().startsWith(u"internal:~join_date~:"_q)) {
+			const auto joinDate = handler->url().split(
+				u"show:"_q,
+				Qt::SkipEmptyParts).last();
+			if (!joinDate.isEmpty()) {
+				const auto weak = base::make_weak(window);
+				window->session().api().resolveJumpToDate(
+					Dialogs::Key(peer->owner().history(peer)),
+					base::unixtime::parse(joinDate.toULongLong()).date(),
+					[=](not_null<PeerData*> p, MsgId m) {
+						const auto f = Window::SectionShow::Way::Forward;
+						if (const auto strong = weak.get()) {
+							strong->showPeerHistory(p, f, m);
+						}
+					});
+				return false;
+			}
 		} else if (SetClickContext<UrlClickHandler>(handler, context)) {
 			return false;
 		}
@@ -1386,8 +1432,8 @@ object_ptr<Ui::RpWidget> DetailsFiller::setupInfo() {
 			? tr::lng_info_about_label()
 			: tr::lng_info_bio_label();
 		addTranslateToMenu(
-			addInfoLine(std::move(label), AboutWithIdValue(user)).text,
-			AboutWithIdValue(user));
+			addInfoLine(std::move(label), AboutWithAdvancedValue(user)).text,
+			AboutWithAdvancedValue(user));
 
 		const auto usernameLine = addInfoOneLine(
 			UsernamesSubtext(_peer, tr::lng_info_username_label()),
@@ -1517,9 +1563,9 @@ object_ptr<Ui::RpWidget> DetailsFiller::setupInfo() {
 
 		const auto about = addInfoLine(tr::lng_info_about_label(), _topic
 			? rpl::single(TextWithEntities())
-			: AboutWithIdValue(_peer));
+			: AboutWithAdvancedValue(_peer));
 		if (!_topic) {
-			addTranslateToMenu(about.text, AboutWithIdValue(_peer));
+			addTranslateToMenu(about.text, AboutWithAdvancedValue(_peer));
 		}
 	}
 	if (!_peer->isSelf()) {
@@ -2641,6 +2687,7 @@ object_ptr<Ui::RpWidget> ActionsFiller::fill() {
 } // namespace
 
 const char kOptionShowPeerIdBelowAbout[] = "show-peer-id-below-about";
+const char kOptionShowChannelJoinedBelowAbout[] = "show-channel-joined-below-about";
 
 object_ptr<Ui::RpWidget> SetupDetails(
 		not_null<Controller*> controller,

Telegram/SourceFiles/info/profile/info_profile_actions.h

@@ -25,6 +25,7 @@ class Controller;
 namespace Info::Profile {
 
 extern const char kOptionShowPeerIdBelowAbout[];
+extern const char kOptionShowChannelJoinedBelowAbout[];
 
 class Cover;
 struct Origin;

Telegram/SourceFiles/settings/settings_experimental.cpp

@@ -147,6 +147,7 @@ void SetupExperimental(
 	addToggle(Core::kOptionFractionalScalingEnabled);
 	addToggle(Window::kOptionViewProfileInChatsListContextMenu);
 	addToggle(Info::Profile::kOptionShowPeerIdBelowAbout);
+	addToggle(Info::Profile::kOptionShowChannelJoinedBelowAbout);
 	addToggle(Ui::kOptionUseSmallMsgBubbleRadius);
 	addToggle(Media::Player::kOptionDisableAutoplayNext);
 	addToggle(kOptionSendLargePhotos);