--- a/src/date.cpp	Sat Aug 12 13:10:34 2023 -0400
+++ b/src/date.cpp	Wed Aug 16 00:49:17 2023 -0400
@@ -1,54 +1,73 @@
-#include "date.h"
-#include <QDate>
-#include <cstdint>
-
-#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 = MAX(0, y);
-}
-
-Date::Date(int32_t y, int8_t m, int8_t d) {
-	year = MAX(0, y);
-	month = CLAMP(m, 1, 12);
-	day = CLAMP(d, 1, 31);
-}
-
-void Date::SetYear(int32_t y) {
-	year = MAX(0, y);
-}
-
-void Date::SetMonth(int8_t m) {
-	month = CLAMP(m, 1, 12);
-}
-
-void Date::SetDay(int8_t d) {
-	day = CLAMP(d, 1, 31);
-}
-
-int32_t Date::GetYear() {
-	return year;
-}
-
-int8_t Date::GetMonth() {
-	return month;
-}
-
-int8_t Date::GetDay() {
-	return day;
-}
-
-QDate Date::GetAsQDate() {
-	return QDate(year, month, day);
-}
+#include "date.h"
+#include <QDate>
+#include <cstdint>
+#include <tuple>
+
+#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 = MAX(0, y);
+}
+
+Date::Date(int32_t y, int8_t m, int8_t d) {
+	year = MAX(0, y);
+	month = CLAMP(m, 1, 12);
+	day = CLAMP(d, 1, 31);
+}
+
+void Date::SetYear(int32_t y) {
+	year = MAX(0, y);
+}
+
+void Date::SetMonth(int8_t m) {
+	month = CLAMP(m, 1, 12);
+}
+
+void Date::SetDay(int8_t d) {
+	day = CLAMP(d, 1, 31);
+}
+
+int32_t Date::GetYear() const {
+	return year;
+}
+
+int8_t Date::GetMonth() const {
+	return month;
+}
+
+int8_t Date::GetDay() const {
+	return day;
+}
+
+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() {
+	return QDate(year, month, day);
+}