init

Datetime.h

@@ -0,0 +1,123 @@
+#include <iostream>
+#include <iomanip>
+#include <string>
+#include <math.h>
+
+class Datetime
+{
+    private:
+    double julian_days = 0;
+
+
+    void init(int days)
+    {
+        julian_days = days;
+    }
+
+
+    void init(int year, int month, int days)
+    {
+        int a = int(14 - month) / 12;
+        int y = year + 4800 - a;
+        int m = month + 12*a - 3;
+        julian_days = days + int((153*m + 2) / 5) + 365*y + int(y/4) - int(y/100) + int(y/400) - 32045;
+    }
+
+    void init(int year, int month, int days, int hours, int minuts, int seconds)
+    {
+        int a = int(14 - month) / 12;
+        int y = year + 4800 - a;
+        int m = month + 12*a - 3;
+        julian_days = days + int((153*m + 2) / 5) + 365*y + int(y/4) - int(y/100) + int(y/400) - 32045;
+
+        julian_days += double(hours - 12) / 24.0 + double(minuts) / 1440.0 + double(seconds) / 86400.0;
+    }
+
+    public:
+    Datetime(int days)
+    {
+        init(days);
+    }
+
+    Datetime(int year, int month, int days)
+    {
+        init(year, month, days);
+    }
+
+    Datetime(int year, int month, int days, int hours, int minuts, int seconds)
+    {
+        init(year, month, days, hours, minuts, seconds);
+    }
+
+    Datetime(std::string data)
+    {
+        int current = 0;
+        int dates[6] = {0,0,0,0,0,0};
+        int date_index = 0;
+        for (int i = 0; i < data.length(); i++) {
+            if (data[i] == ':' or data[i] == '-' or data[i] == '.' or data[i] == ' ') {
+                if (date_index > 5)
+                    throw "Неправильный формат даты";
+                dates[date_index] = current ;
+                date_index++;
+                current = 0;
+                continue;
+            }
+            current = current*10 + int(data[i] - '0');
+        }
+        dates[date_index] = current;
+
+        init(dates[0], dates[1], dates[2], dates[3], dates[4], dates[5]);
+    }
+
+    friend std::ostream &operator <<(std::ostream &os, Datetime &dt)
+    {
+        int a = dt.julian_days + 32044;
+        int b = (4*a + 3) / 146097;
+        int c = a - ((146097*b) / 4);
+        int d = (4*c + 3) / 1461;
+        int e = c - ((1461*d) / 4);
+        int m = (5*e + 2) / 153;
+
+        int days = e - ((153*m + 2) / 5) + 1;
+        int month = m + 3 - 12 * (m/10);
+        int years = 100*b + d - 4800 + (m/10);
+
+
+        int hours = ((dt.julian_days - double(int(dt.julian_days)))*24 + 12*24) / 24; 
+        int minuts = ((dt.julian_days - double(int(dt.julian_days))) * 1440) - int(dt.julian_days - double(int(dt.julian_days)))*24;
+        int seconds = (dt.julian_days - double(int(dt.julian_days))) * 86400 - minuts*60 - int(dt.julian_days - double(int(dt.julian_days)))*24;  
+
+        os << std::setw(4) << std::setfill('0') << years << ':' 
+        << std::setw(2) << std::setfill('0') << month << ':' 
+        << std::setw(2) << std::setfill('0') << days << 'T'
+        << std::setw(2) << std::setfill('0') << hours << ':'
+        << std::setw(2) << std::setfill('0') << minuts << ':'
+        << std::setw(2) << std::setfill('0') << seconds;
+        return os;
+    }
+
+    Datetime& operator += (const Datetime& r)
+    {
+        julian_days += r.julian_days;
+        return *this;
+    }
+
+    Datetime operator + (const Datetime& r) const
+    {
+        Datetime res(*this);
+        return res += r;
+    }
+
+    Datetime& operator -= (const Datetime& r)
+    {
+        julian_days -= r.julian_days;
+        return *this;
+    }
+
+    Datetime operator - (const Datetime& r) const
+    {
+        Datetime res(*this);
+        return res -= r;
+    }
+};

main.cpp

@@ -0,0 +1,15 @@
+#include <iostream>
+#include "Datetime.h"
+#include <string>
+
+using namespace std;
+
+int main() {
+    Datetime d2(2024, 10, 10, 12, 57, 34);
+    cout << d2 << endl;
+    Datetime d3(1, 1, 1);
+    cout << d3 << endl;
+    d2+=d3;
+    cout << d2 << endl;
+    return 0;
+}