Calculating with dates

Repentinus (31)
Hi. Can someone recommend functions to calculate with dates?

Thanks,
Repentinus

Actually, I have a code too, but it doesn't do it correctly:

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#include <iostream>
#include <windows.h>
#include <string.h>

using namespace std;

int main() {
	bool Error;
	unsigned int d, m, y, dE, dJ, mE, mJ, yE, yJ;
	
	cout << "P" << char(132) << "ev: \t", cin >> d;
	cout << "Kuu: \t", cin >> m; //Month
	cout << "Aasta:\t", cin >> y; //Year
	
	yJ = y;
	yE = y;
	Error = false;
	
	//Andmete kontroll
	if ((d < 1 || d > 31) || (m < 1 || m > 12))
		Error = true;
		
	//Kuu algus
	else if (d == 1) {
		if (d == 1 && (m == 2||4||6||9||11)) {
			dE=31;
			mE=m-1;
			dJ=d++;
			mJ=m;
		};
		if (d == 1 && (m == 5||7||8||10||12)) {
			dE=30;
			mE=m-1;
			dJ=d++;
			mJ=m;
		};
		if (d == 1 && m == 1) {
			dE=31;
			mE=12;
			yE=y--;
			dJ=d++;
			mJ=m;
			yJ=y;
		};
		if (d == 1 && m == 3) {
			if ((y % 4 != 0) || (y % 4 == 0 && y % 100 == 0 && y % 400 !=0)) {
				dE=28;
				mE=2;
				dJ=d++;
				mJ=m;
			};
			if ((y % 4 == 0) || (y % 4 == 0 && y % 100 == 0 && y % 400 == 0)) {
				dE=29;
				mE=2;
				dJ=d++;
				mJ=m;
			};
		};
	};
	
	//Kuu lõpp
	if (d == 31) {
		if (m == 1||3||5||7||8||10) {
			dE=d--;
			dJ=1;
			mE=m;
			mJ=m++;
		};
		if (m == 12) {
			dE=d--;
			dJ=1;
			mE=m;
			mJ=1;
			yE=y;
			yJ=y++;
		};
		if ( m != 1||3||5||7||8||10||12)
			Error = true;
	};
	
	if (d == 30 && (m == 4||6||9||11)) {
		dE=d--;
		dJ=1;
		mE=m;
		mJ=m++;
	};
	
	if (d == 28 && m == 2) {
			if ((y % 4 != 0) || (y % 4 == 0 && y % 100 == 0 && y % 400 !=0)) {
				dE=27;
				mE=2;
				dJ=1;
				mJ=m;
			};
			if ((y % 4 == 0) || (y % 4 == 0 && y % 100 == 0 && y % 400 ==0)) {
				dE=27;
				mE=2;
				dJ=29;
				mJ=m;
			};
	};
	
	if (d == 29 && m == 2) {
		dE=28;
		dJ=1;
		mE=m;
		mJ=m++;
	};
	
	if ((d != 1||31) || (d != 30 && m != 4||6||9||11) || (d != 28||29 && m != 2)) {
		dE=d--;
		dJ=d++;
		mE=m;
		mJ=m;
	};
	
	if (dE || dJ == d) {
		Error = false;
	};
	
	if (Error == false) {
		cout << "Eelmine p" << char(132) << "ev:\t" << dE << "." << mE << "." << yE << endl; //Yesterday
		cout << "J" << char(132) << "rgmine p" << char(132) << "ev:\t" << dJ << "." << mJ << "." << yJ << endl; //Tomorrow
		
		system("Pause");
	};
	if (Error == true) {
		cout << "Ilmnes viga." << endl; //Error
		Sleep(1000);
		
		system("Exit");
	};

};
Last edited on
Repentinus (31)
Well, I figured out how i can do that correctly.
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#include <iostream>
#include <windows.h>

using namespace std;

int main() {
	int d, m, y, x, de, dj, me, mj, ye, yj;
	
	cout << "P" << char(132) << "ev :\t", cin >> d; //Day
	cout << "Kuu:\t", cin >> m; //Month
	cout << "Aasta:\t", cin >> y; //Year
	
	int MaxDays [12] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
	if ((y % 4 == 0 && y % 100 != 0) || (y % 4 == 0 && y % 100 == 0 && y % 400 == 0))
		MaxDays[1] = 29;
	x = m-1;
	
	if ((d > MaxDays[x]) || (d < 1) || (m < 1) || (m > 12)) {
		cout << "Viga andmetes. L" << char(147) << "petan.";
		Sleep(1000);
		system("exit");
	}; //Andmete kontroll - Checking data
	de = d-1, dj = d+1, me = m, mj = m, yj = y, ye = y; // Üldjuhul - Usually
	
	if (d == MaxDays[x]) {
		dj = 1, mj = m+1;
		if (m == 12) {
			yj = y+1;
		};
	};
	
	if (d == 1) {
		de = MaxDays[x-1];
		if (m != 1) {
			me = m--;
		};
		if (m == 1) {
			me = 12;
		};
	};
	
	cout << "Eelmine kuup" << char(132) << "ev: \t" << de << "." << me << "." << ye << endl; //Yesterday
	cout << "Praegune kuup" << char(132) << "ev: \t" << d << "." << m << "." << y << endl; //Today
	cout << "J" << char(132) << "rgmine kuup" << char(132) << "ev:\t " << dj << "." << mj << "." << yj << endl; //Tomorrow
	system("Pause");
};
DimitriuS (15)
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#include<iostream>

using namespace std;

/*-- Function prototypes--*/
int POS_INT_TRANS(char* system_number);
bool Switch_ERROR_message_ALERT(int d,int m,int y);

unsigned long int GeT_The_NumbER_of_DAYS();//up to 4.294.967.296 days , approximately 11.767.033 years (365 days per year).

/*--global variables--*/
char date_buf[13];
char temp_day[3];
char temp_month[3];
char temp_year[6];

int day1,day2;
int month1,month2;
int year1,year2;

main( int argc , char* argv[] )/*--this program does not use the main arguments.*/
{
 bool Sc=0;
 char ch1,ch2;

 do
 {
  cout<<"Enter the first date in the following format DD-MM-YYYY(for Europe)--:";
  cin.get(date_buf[0]);//--in case the user press 'enter' without giving any other data
  
  if( date_buf[0]==10 )
  {
   cout<<"--ERROR--Wrong format of the given data."<<endl;
   continue;
  }
  
  cin.get( date_buf+1,11 );

  for(int i=0; i<2; i++)
  {
   temp_day[i]=date_buf[i];
   temp_day[i+1]='\0';
  } 
  for(int c=0,i=3; i<5; c++,i++)
  {
   temp_month[c]=date_buf[i];
   temp_month[c+1]='\0';
  }
  for(int c=0,i=6; i<10; c++,i++)
  {
   temp_year[c]=date_buf[i];
   temp_year[c+1]='\0';
  }
  day1  =POS_INT_TRANS( temp_day );
  month1=POS_INT_TRANS( temp_month );
  year1 =POS_INT_TRANS( temp_year );

  Sc=Switch_ERROR_message_ALERT(day1,month1,year1);
  
  cin.ignore(4096,'\n');
 }
 while(!Sc);
/*------end of first input block-------------------------------------------------------------------*/
/***************************************************************************************************/
/*--------second input block-----------------------------------------------------------------------*/
/***************************************************************************************************/
 Sc=0;
 
 do
 {
  cout<<"Enter the second date (the way you did previously)---------------------:";
  cin.get(date_buf[0]);//--in case the user press 'enter' without giving any other data
  
  if( date_buf[0]==10 )
  {
   cout<<"--ERROR--Wrong format of the given data."<<endl;
   continue;
  }  
  cin.get( date_buf+1,11 );

  for(int i=0; i<2; i++)
  {
   temp_day[i]=date_buf[i];
   temp_day[i+1]='\0';
  }
  
  for(int c=0,i=3; i<5; c++,i++)
  {
   temp_month[c]=date_buf[i];
   temp_month[c+1]='\0';
  }
 
  for(int c=0,i=6; i<10; c++,i++)
  {
   temp_year[c]=date_buf[i];
   temp_year[c+1]='\0';
  } 
  day2  =POS_INT_TRANS( temp_day ); 
  month2=POS_INT_TRANS( temp_month );
  year2 =POS_INT_TRANS( temp_year );

  Sc=Switch_ERROR_message_ALERT(day2,month2,year2);
  
  cin.ignore(4096,'\n');
 }
 while(!Sc);
/*------end of second input block-------------------------------------------------------------------*/
/*********************************************************************************************/
 system("clear");
 cout<<"---***************************---"<<endl;
 cout<<"---******----RESULTS----******---"<<endl;
 cout<<"---***************************---"<<endl;
 cout<<"---------------------------------"<<endl;
 cout<<"---OldER DaTE--:"<<day1<<"-"<<month1<<"-"<<year1<<endl;
 cout<<"---NewER  DaTE--:"<<day2<<"-"<<month2<<"-"<<year2<<endl;

 unsigned long int TOTAL_DAYS=GeT_The_NumbER_of_DAYS();//--call of GeT_The_NumbER_of_DAYS() routine
 cout<<"----****--"<<TOTAL_DAYS<<" days between these two dates!!---"<<endl;
 cout<<"\n-------EnD OF ThE PRogrAM!!!---ByE----"<<endl;
}
/*------END OF MAIN FUNCTION BLOCK------------------------------------------------------------------*/
/****************************************************************************************************/
/*-----------------FUNCTIONS FIELD------------------------------------------------------------------*/
/****************************************************************************************************/
/*-----Function GeT_The_NumbER_of_DAYS------*/
unsigned long int GeT_The_NumbER_of_DAYS()
{
 int m_day1,m_month1,m_year1,m_day2,m_month2,m_year2;
 int C,Bound,month_CounteR;
 int TotaL_DAYS=0;
 
 if( (year1<year2) || ((year1==year2) && (month1<month2)) || ((year1==year2) && (month1==month2) && (day1<=day2)) )
 {
  m_day1=day1;
  m_day2=day2;
  m_month1=month1;
  m_month2=month2;
  m_year1=year1;
  m_year2=year2;
 }
 if( (year1>year2) || ((year1==year2) && (month1>month2)) || ((year1==year2) && (month1==month2) && (day1>day2)) )
 {
  m_day1=day2;
  m_day2=day1;
  m_month1=month2;
  m_month2=month1;
  m_year1=year2;
  m_year2=year1;
 }

 for(int y=m_year1; y<=m_year2; y++)
 {
  if( y==m_year1 )
  {
   C=m_month1;
   month_CounteR=12;
  }
  if( y==m_year2 )
  {
   month_CounteR=m_month2-1;
  }

  for(C; C<=month_CounteR; C++)
  {
   if( ((C%2==1)&&(C!=9)&&(C!=11)) || C==8 || C==10 || C==12 )//-January-March-May-July-August-October-December-
   {
    TotaL_DAYS=TotaL_DAYS+31;
    continue;
   } 
 
   if( (C==2)&&(y%4==0) )//-February and leap year-
   {
    TotaL_DAYS=TotaL_DAYS+29; 
    continue ;
   } 
  
   if( (C==2)&&(y%4!=0) )//-February and no leap year-
   { 
    TotaL_DAYS=TotaL_DAYS+28;
    continue;
   }
  
   TotaL_DAYS=TotaL_DAYS+30;//-Normal-*-April-June-September-November-
  }//--end of internal loop
  //cout<<TotaL_DAYS<<endl;
  C=1;
 }//--end of external loop
 
 TotaL_DAYS=TotaL_DAYS-m_day1+m_day2;

 return TotaL_DAYS;
}
/*################################################################*/
/*-----Function POS_INT_TRANS------*/
int POS_INT_TRANS(char* system_number)/*--this function transforms a string ONLY into a POSITIVE integer.-only 0-9 characters accepted*/

{
 int sum=0;

 if(system_number==0)
 {
  return -1;
 }
 for(int i=0; system_number[i]!='\0'; i++)
 {
  if( system_number[i]<48 || system_number[i]>57 )
  {
   return -1;//no arithmetic characters
  }       
 }
 sum=atoi(system_number);

 return sum;
}
/*################################################################*/
/*-----Function switch_error_message_alert------*/
bool Switch_ERROR_message_ALERT(int d,int m,int y)
{
 int control=-1;

 if(y<0)
 control=1;
 if(m>12)
 control=2;
 if(m<1)
 control=3;
 if(d>31)
 control=4;
 if(d<1)
 control=5;
 if(m==2/*February*/ && d>29)
 control=6;
 if(m==2 && (y%4)!=0/*no leap year*/ && d==29)
 control=7;
 if(m==4/*April*/ && d==31)
 control=8;
 if(m==6/*June*/ &&d==31)
 control=9;
 if(m==9/*September*/ && d==31)
 control=10;
 if(m==11/*November*/ && d==31)
 control=11;

 if(date_buf[0]==45||date_buf[1]==45||date_buf[2]!=45||date_buf[3]==45||date_buf[4]==45||date_buf[5]!=45||date_buf[6]==45||date_buf[6]==0||date_buf[7]==45||date_buf[7]==0||date_buf[8]==45||date_buf[8]==0||date_buf[9]==45||date_buf[9]==0||date_buf[10]!=0)
 {
  control=0;
 }

 switch( control )
 {
  case  0: cout<<"--ERROR--Wrong format of the given data."<<endl; break;
  case  1: cout<<"--ERROR--The year you gave is invalid.Year should be >0 and <=9999."<<endl; return 0; break;
  case  2: cout<<"--ERROR--The month you gave is invalid.Month should be >0 and <13."<<endl; return 0; break;
  case  3: cout<<"--ERROR--The month you gave is invalid.Month should be >0 and <13."<<endl; return 0; break;
  case  4: cout<<"--ERROR--The day you gave is too large.Day should be >0 and <32."<<endl; return 0; break;
  case  5: cout<<"--ERROR--The day you gave is invalid.Day should be >0 and <32."<<endl; return 0; break;
  case  6: cout<<"--ERROR--There is no such day["<<d<<"] on February."<<endl; return 0; break;
  case  7: cout<<"--ERROR--The year["<<y<<"] is not a leap one.Thus,29th February "<<y<<" is not a valid date."<<endl; return 0; break;
  case  8: cout<<"--ERROR--April has just 30 days."<<endl; return 0; break;
  case  9: cout<<"--ERROR--June has just 30 days."<<endl; return 0; break;
  case 10: cout<<"--ERROR--September has just 30 days."<<endl; return 0; break;
  case 11: cout<<"--ERROR--November has just 30 days."<<endl; return 0; break;
  
  default : return 1; break; 
 }
}
DimitriuS (15)
The program above calculates the number of days between to dates.I hope it be useful for u because is similar to yours.
Last edited on
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