Display date of birth in user profiles.

Telegram/SourceFiles/data/data_birthday.cpp

@@ -7,6 +7,11 @@ https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
 */
 #include "data/data_birthday.h"
 
+#include "base/timer_rpl.h"
+#include "lang/lang_keys.h"
+
+#include <QtCore/QDate>
+
 namespace Data {
 namespace {
 
@@ -66,5 +71,62 @@ int Birthday::year() const {
 	return _value / 10000;
 }
 
+QString BirthdayText(Birthday date) {
+	if (const auto year = date.year()) {
+		return tr::lng_month_day_year(
+			tr::now,
+			lt_month,
+			Lang::MonthSmall(date.month())(tr::now),
+			lt_day,
+			QString::number(date.day()),
+			lt_year,
+			QString::number(year));
+	} else if (date) {
+		return tr::lng_month_day(
+			tr::now,
+			lt_month,
+			Lang::MonthSmall(date.month())(tr::now),
+			lt_day,
+			QString::number(date.day()));
+	}
+	return QString();
+}
+
+QString BirthdayCake() {
+	return QString::fromUtf8("\xf0\x9f\x8e\x82");
+}
+
+int BirthdayAge(Birthday date) {
+	if (!date.year()) {
+		return 0;
+	}
+	const auto now = QDate::currentDate();
+	const auto day = QDate(date.year(), date.month(), date.day());
+	if (!day.isValid() || day >= now) {
+		return 0;
+	}
+	auto age = now.year() - date.year();
+	if (now < QDate(date.year() + age, date.month(), date.day())) {
+		--age;
+	}
+	return age;
+}
+
+bool IsBirthdayToday(Birthday date) {
+	if (!date) {
+		return false;
+	}
+	const auto now = QDate::currentDate();
+	return date.day() == now.day() && date.month() == now.month();
+}
+
+rpl::producer<bool> IsBirthdayTodayValue(Birthday date) {
+	return rpl::single() | rpl::then(base::timer_each(
+		60 * crl::time(1000)
+	)) | rpl::map([=] {
+		return IsBirthdayToday(date);
+	}) | rpl::distinct_until_changed();
+}
+
 } // namespace Data
 

Telegram/SourceFiles/data/data_birthday.h

@@ -38,4 +38,10 @@ private:
 
 };
 
+[[nodiscard]] QString BirthdayText(Birthday date);
+[[nodiscard]] QString BirthdayCake();
+[[nodiscard]] int BirthdayAge(Birthday date);
+[[nodiscard]] bool IsBirthdayToday(Birthday date);
+[[nodiscard]] rpl::producer<bool> IsBirthdayTodayValue(Birthday date);
+
 } // namespace Data