get_date.cpp

#include <iostream>
#include <stdint.h>
using namespace std;

char compileDate[16] = __DATE__;

uint16_t const monPattern[12] = {
//ascii added together
    281,    // J+a+n = 74+97+110
    269,    // F+e+b = 70+101+98
    288,    // M+a+r = 77+97+114
    291,    // A+p+r = 65+112+114
    295,    // M+a+y = 77+97+121
    301,    // J+u+n = 74+117+110
    299,    // J+u+l = 74+117+108
    285,    // A+u+g = 65+117+103
    296,    // S+e+p = 83+101+112
    294,    // O+c+t = 79+99+116
    307,    // N+o+v = 78+111+118
    268,    // D+e+c = 68+101+99
};

//name of months
const char* months[12] {
    "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};

//get compile month in integers
int decideMonth(){
    //get monPattern by adding ascii
    int add = 0;
    for(int i=0; i<3;i++){
        add += compileDate[i];
    }

    //what month?
    int mon = 0;
    for(int j=0; j<12; j++){
        if(add==monPattern[j]){
            mon = j+1;
        }
    }
    return mon;
}
int month = decideMonth();

//get compile date in integers
int decideDate(){
    //get date, converting from ascii to decimal
    int dt=0;
    for (int i=4; i<6; i++){
        if (compileDate[i] != ' '){
            dt = dt*10 + (compileDate[i]-48);
        }
    }
    return dt;
}
int date = decideDate();

//get compile year in integers
int decideYear(){
    //get year, converting from ascii to decimal
    int yr = 0;
    for (int i=7; i<11; i++){
        yr = yr*10 + (compileDate[i]-48);
    }
    return yr;
}
int year = decideYear();

// number of days in a month
int get_maxDays(int mon){
    //30 day months
    if (mon==4 || mon==6 || mon==9 || mon==11){
        return 30;
    }

    //special case on Feb
    else if (mon==2){
        if (year%4==0){
            return 29;
        }
        else {
            return 28;
        }
    }

    //31 day months
    else {
        return 31;
    }
}
int maxDays = get_maxDays(month);
const int maxMonth = 12;

//next month
void checkMonth(){
    if (date > maxDays){
        date -= maxDays;                //1st new month
        month++;                        //new month
        maxDays = get_maxDays(month);   //new month's maxDays
    }
}

//next year
void checkYear(){
    if (month > maxMonth){
        month -= maxMonth;  //Jan new year
        year++;             //new year
    }
}

//when hit 00:00 next day, date++
//checkMonth() and checkYear() every date++

//today (idk how to do this)
string today(){
    return string(months[month-1]) + " " + to_string(date) + " " + to_string(year);
}

int main(){
    cout << compileDate << endl;
    cout << months[month-1] << ' ' << date << ' ' << year << endl; //i want the today function to output this thing
    cout << today() << endl;
    return 0;
}