/* usage enter date in following format dd/mm/yyyy d: day e.g 5 m: month e.g 11 yyyy: year e.g 2001 enter a period in the following format X Period X: integer representing the length of time Period: The period of time the length represents e.g 5 Days 2 Months 12 Years Complete input example: 5/1/1985 125 Days This represents 5th Jan 1985 + 125 Days Note; Due to restrictions of c++ date handling (time_t) dates before 1970 won't operate correctly :( */ #include #include #include #include #include #include void printDate(std::tm date) { char buffer[50]; strftime(buffer, 50, "%B, %d %Y - %A",&date); std::cout << buffer << std::endl; } /* parse input converts string e.g 3 years into std::pair e.g y, 3 valid keys: d: days m: months y: years TODO: error checking */ std::pair parsePeriod(std::string input) { char key; int length; sscanf(input.c_str(), "%d%s", &length, &key); return std::make_pair(std::tolower(key), length); } /* parse date converts string date into time_t date TODO: Error checking. (check for mangled dates / non conforming date data) */ std::tm parseDate(std::string date) { int year, month, day; sscanf(date.c_str(),"%d%*c%d%*c%d", &day, &month, &year); std::tm rawDate; rawDate.tm_isdst = 0; rawDate.tm_sec = 0; rawDate.tm_min = 0; rawDate.tm_hour = 12; rawDate.tm_year = year-1900; rawDate.tm_mon = month-1; rawDate.tm_mday = day; mktime(&rawDate); return rawDate; } /* adds specified period length to date */ std::tm addDate(std::tm newDate, char period, int length) { newDate.tm_isdst = 0; newDate.tm_sec = 0; newDate.tm_min = 0; newDate.tm_hour = 12; switch(period){ case 'd': newDate.tm_mday = newDate.tm_mday + length; break; case 'm': newDate.tm_mon = newDate.tm_mon + length; break; case 'y': newDate.tm_year = newDate.tm_year + length; break; } mktime(&newDate); return newDate; } void clearInputBuffer() { std::cin.clear(); std::cin.ignore(INT_MAX,'\n'); } std::tm getDate() { std::string inputDate; std::cin >> inputDate; clearInputBuffer(); //echo input std::cout << "Date Entered: " << inputDate << std::endl; return parseDate(inputDate); } std::pair getPeriod() { std::string inputPeriod; std::getline(std::cin, inputPeriod); clearInputBuffer(); //echo input std::cout << "Period entered: " << inputPeriod << std::endl; return parsePeriod(inputPeriod); } int main() { std:tm origdate = getDate(); std::pair period = getPeriod(); //print parsed date std::cout << "Parsed date: " << std::endl; printDate(origdate); //add period to date; std::tm newDate = addDate(origdate, period.first, period.second); mktime(&newDate); printDate(newDate); return 0; }

workingWithDates