1 files changed, 83 insertions, 0 deletions
diff --git a/src/openvic/Date.hpp b/src/openvic/Date.hpp
new file mode 100644
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--- /dev/null
+++ b/src/openvic/Date.hpp
@@ -0,0 +1,83 @@
+#pragma once
+
+#include <cstdint>
+#include <string>
+#include <ostream>
+
+namespace OpenVic {
+	// A relative period between points in time, measured in days
+	struct Timespan {
+		using day_t = int64_t;
+	private:
+		day_t days;
+	public:
+		Timespan(day_t value = 0);
+
+		bool operator<(Timespan other) const;
+		bool operator>(Timespan other) const;
+		bool operator<=(Timespan other) const;
+		bool operator>=(Timespan other) const;
+		bool operator==(Timespan other) const;
+		bool operator!=(Timespan other) const;
+
+		Timespan operator+(Timespan other) const;
+		Timespan operator-(Timespan other) const;
+		Timespan operator*(day_t factor) const;
+		Timespan operator/(day_t factor) const;
+		Timespan& operator+=(Timespan other);
+		Timespan& operator-=(Timespan other);
+		Timespan& operator++();
+		Timespan operator++(int);
+
+		explicit operator day_t() const;
+		explicit operator double() const;
+		explicit operator std::string() const;
+	};
+	std::ostream& operator<< (std::ostream& out, Timespan timespan);
+
+	// Represents an in-game date
+	// Note: Current implementation does not account for leap-years, or dates before Year 0
+	struct Date {
+		using year_t = uint16_t;
+		using month_t = uint8_t;
+		using day_t = uint8_t;
+
+		static constexpr Timespan::day_t MONTHS_IN_YEAR = 12;
+		static constexpr Timespan::day_t DAYS_IN_YEAR = 365;
+		static constexpr Timespan::day_t DAYS_IN_MONTH[MONTHS_IN_YEAR] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
+		static constexpr Timespan::day_t DAYS_UP_TO_MONTH[MONTHS_IN_YEAR] = { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
+	private:
+		// Number of days since Jan 1st, Year 0
+		Timespan timespan;
+
+		static Timespan _dateToTimespan(year_t year, month_t month, day_t day);
+	public:
+		// The Timespan is considered to be the number of days since Jan 1st, Year 0
+		Date(Timespan total_days);
+		// Year month day specification
+		Date(year_t year = 0, month_t month = 1, day_t day = 1);
+
+		year_t getYear() const;
+		month_t getMonth() const;
+		day_t getDay() const;
+
+		bool operator<(Date other) const;
+		bool operator>(Date other) const;
+		bool operator<=(Date other) const;
+		bool operator>=(Date other) const;
+		bool operator==(Date other) const;
+		bool operator!=(Date other) const;
+
+		Date operator+(Timespan other) const;
+		Timespan operator-(Date other) const;
+		Date& operator+=(Timespan other);
+		Date& operator-=(Timespan other);
+		Date& operator++();
+		Date operator++(int);
+
+		explicit operator std::string() const;
+		// Parsed from string of the form YYYY.MM.DD
+		static Date from_string(std::string const& date);
+	};
+	std::ostream& operator<< (std::ostream& out, Date date);
+}