--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/core/date.cpp	Sun Sep 10 03:59:16 2023 -0400
@@ -0,0 +1,124 @@
+#include "core/date.h"
+#include "core/json.h"
+#include <QDate>
+#include <cstdint>
+#include <tuple>
+
+/* An implementation of AniList's "fuzzy date" */
+
+#define MIN(A, B)                                                                                                      \
+	({                                                                                                                 \
+		__typeof__(A) __a = (A);                                                                                       \
+		__typeof__(B) __b = (B);                                                                                       \
+		__a < __b ? __a : __b;                                                                                         \
+	})
+#define MAX(A, B)                                                                                                      \
+	({                                                                                                                 \
+		__typeof__(A) __a = (A);                                                                                       \
+		__typeof__(B) __b = (B);                                                                                       \
+		__a < __b ? __b : __a;                                                                                         \
+	})
+
+#define CLAMP(x, low, high)                                                                                            \
+	({                                                                                                                 \
+		__typeof__(x) __x = (x);                                                                                       \
+		__typeof__(low) __low = (low);                                                                                 \
+		__typeof__(high) __high = (high);                                                                              \
+		__x > __high ? __high : (__x < __low ? __low : __x);                                                           \
+	})
+
+Date::Date() {
+}
+
+Date::Date(int32_t y) {
+	year = std::make_unique<int32_t>(MAX(0, y));
+}
+
+Date::Date(int32_t y, int8_t m, int8_t d) {
+	year = std::make_unique<int32_t>(MAX(0, y));
+	month = std::make_unique<int8_t>(CLAMP(m, 1, 12));
+	day = std::make_unique<int8_t>(CLAMP(d, 1, 31));
+}
+
+void Date::VoidYear() {
+	year.reset();
+}
+
+void Date::VoidMonth() {
+	month.reset();
+}
+
+void Date::VoidDay() {
+	day.reset();
+}
+
+void Date::SetYear(int32_t y) {
+	year = std::make_unique<int32_t>(MAX(0, y));
+}
+
+void Date::SetMonth(int8_t m) {
+	month = std::make_unique<int8_t>(CLAMP(m, 1, 12));
+}
+
+void Date::SetDay(int8_t d) {
+	day = std::make_unique<int8_t>(CLAMP(d, 1, 31));
+}
+
+int32_t Date::GetYear() const {
+	int32_t* ptr = year.get();
+	if (ptr != nullptr)
+		return *year;
+	return -1;
+}
+
+int8_t Date::GetMonth() const {
+	int8_t* ptr = month.get();
+	if (ptr != nullptr)
+		return *month;
+	return -1;
+}
+
+int8_t Date::GetDay() const {
+	int8_t* ptr = day.get();
+	if (ptr != nullptr)
+		return *day;
+	return -1;
+}
+
+bool Date::operator<(const Date& other) const {
+	int o_y = other.GetYear(), o_m = other.GetMonth(), o_d = other.GetDay();
+	return std::tie(*year, *month, *day) < std::tie(o_y, o_m, o_d);
+}
+
+bool Date::operator>(const Date& other) const {
+	return other < (*this);
+}
+
+bool Date::operator<=(const Date& other) const {
+	return !((*this) > other);
+}
+
+bool Date::operator>=(const Date& other) const {
+	return !((*this) < other);
+}
+
+QDate Date::GetAsQDate() const {
+	return QDate(*year, *month, *day);
+}
+
+nlohmann::json Date::GetAsAniListJson() const {
+	nlohmann::json result;
+	if (year.get())
+		result.insert(result.end(), {"year", *year});
+	else
+		result.insert(result.end(), {"year", nullptr});
+	if (month.get())
+		result.insert(result.end(), {"month", *month});
+	else
+		result.insert(result.end(), {"month", nullptr});
+	if (day.get())
+		result.insert(result.end(), {"day", *day});
+	else
+		result.insert(result.end(), {"day", nullptr});
+	return result;
+}