#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <time.h>
#include <stdbool.h>


int main1() {

	time_t now = time(NULL);

	struct tm* datum = localtime(&now);
	printf("År:%d", datum->tm_year + 1900);
	if (datum->tm_mon + 1== 10) {
		printf("stjärthål");


	}
	if (datum->tm_wday == 3) {

		printf("Röv");
	}
	else if (datum->tm_wday == 5) {
		printf("Carl");
	}

	struct tm thomasBirthday;
	thomasBirthday.tm_year = 90;
	thomasBirthday.tm_mon = 2;
	thomasBirthday.tm_mday = 31;
	thomasBirthday.tm_hour = 0;
	thomasBirthday.tm_min = 0;
	thomasBirthday.tm_sec = 0;


	thomasBirthday.tm_mon += 8; // plussar på 8 månader
	mktime(&thomasBirthday); // måste lägga till denna för att det ska fixa till
	time_t thomasTime = mktime(&thomasBirthday);


	printf("år: %d",thomasBirthday.tm_year + 1900);
	printf("mån: %d",thomasBirthday.tm_mon + 1);
	printf("dag: %d",thomasBirthday.tm_mday);

}


void main2() {


	time_t mytime = time(NULL);
	char* time_str = ctime(&mytime);
	time_str[strlen(time_str) - 1] = '\0';
	printf("Current Time : %s\n", time_str);



	return 0;

}


void main3() {

	time_t now = time(NULL);

	struct tm* datum = localtime(&now);



	printf("year:%d\n", datum->tm_year + 1900);
	printf("mon:%d\n", datum->tm_mon + 1);
	printf("day:%d\n", datum->tm_mday);
	printf("hour:%d\n", datum->tm_hour);
	printf("min:%d\n", datum->tm_min);
	printf("sec:%d\n", datum->tm_sec);

}

int dayofweek(int d, int m, int y)
{
	static int t[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
	y -= m < 3;
	return (y + y / 4 - y / 100 + y / 400 + t[m - 1] + d) % 7;
}

void main4() {


	int day = dayofweek(7, 11, 2016);
	if (day == 1)
		printf("Måndag");
	else if (day == 2)
		printf("tis");
	else if (day == 3)
		printf("ons");
	else if (day == 4)
		printf("tors");
	else if (day == 5)
		printf("fre");
	else if (day == 6)
		printf("loerdag");
	else if (day == 0)
		printf("soendag");



}


void main5() {

	time_t now = time(NULL);

	struct tm* date = localtime(&now);




	date->tm_mday = 23;
	date->tm_mon = 9;
	date->tm_year = 119;
	date->tm_mday += 40;

	mktime(date);

	printf("%d\n", date->tm_mday);
	printf("%d\n", date->tm_mon + 1);
	printf("%d\n", date->tm_year + 1900);

}

void main() {
	time_t now = time(NULL);

	struct tm *date = localtime(&now);




	date->tm_mday = 23;
	date->tm_mon = 9;
	date->tm_year = 119;



	for (int i = 0; i < 10; i++)
	{
		date->tm_mday += 40;

		mktime(date);
		printf("dag:%d\n", date->tm_mday);
		printf("mon:%d\n", date->tm_mon + 1);
		printf("year:%d\n", date->tm_year + 1900);
	}

}
void main8() {
	int month = 9;
	int year = 2020;
	int numberOfDays;
	if (month == 4 || month == 6 || month == 9 || month == 11)
		numberOfDays = 30;
	else if (month == 2)
	{
		bool isLeapYear = (year % 4 == 0 && year % 100 != 0) || (year % 400 == 0);
		if (isLeapYear)
			numberOfDays = 29;
		else
			numberOfDays = 28;
	}
	else
		numberOfDays = 31;

	printf("year :%d mon: %d Have %d numb of days", year, month, numberOfDays);
}


time_t GetWhenStoppedWithNapp(struct tm birthday)
{
	birthday.tm_mday += 100;
	return mktime(&birthday);
}

int main()
{
	time_t t = 1;//1970-01-01--00:00:01
	time_t tiden = time(NULL);

	struct tm* tidStructPtr = localtime(&tiden);
	struct tm* gammalPtr = localtime(&t);
	struct tm kopia1 = *tidStructPtr; // NY kopia av tid struct

	// mktime grejer!!!!
	struct tm stefansBirthday;
	stefansBirthday.tm_year = 1972 - 1900; // MINUS 1900 för time grejen
	stefansBirthday.tm_mon = 7;
	stefansBirthday.tm_mday = 3;
	stefansBirthday.tm_hour = 0;
	stefansBirthday.tm_min = 0;
	stefansBirthday.tm_sec = 0;

	stefansBirthday.tm_mday += 40;
	// VVV sätter mktime till variabel stefansBirthdayTime men går utan också
	time_t stefansBirthdayTime = GetWhenStoppedWithNapp(stefansBirthday);


	mktime(&stefansBirthday); //DETTA går också (utan variabel)

	printf("%d", stefansBirthday.tm_mday);
}