Adding days to a date

[programgirl]

We were given an assignment to add a number of days to a date. So I would add for example 10 days to Jan 20, 2013. I understand operator overloading and I an ignoring the leap year issue for now, what I can't figure out is the logic needed to add a certain numbers of days to a specified date.

I've done programs in the past where you add hours and minutes, but this is easy because an hour is always 60 mins and a minute is always 60 seconds, so you can easily use % 60. But with months all the days are different.

Would it make sense to correspond every day with a certain number, then add the numbers and convert it back to a date? For example, Jan 1 is the first day of the year, so if I add 32 to Jan 1 I get the 32nd day of the year which is Feb 1. (if it's not a leap year). And I would convert 32 to Feb 1? I'm not sure how I would do it, but do you think that would make sense for an algorithm or am I totally overthinking this?

I'm sure there is already pre-written templates for this, but we have not been taught those so it needs to be done without using any library or template.

[IceThatJaw]

If you want to it all manually you could create a Date class that contains a Month class, Year class, and an int for days.

[paistede]

Im new to this so I probably will not be any help but if jan is 1-31 and feb is 32-58 than: Jan 20 + 30=50, 50 - 31 = 19 the result would be feb 19 which you might be able to do with an if or while statement.

if (ans>31) && (ans<58)
cout << "Feb" << ans

[tntxtnt]

- first I will convert (day,month,year) (Gregorian) to Julian day number https://en.wikipedia.org/wiki/Julian_day#Converting_Julian_or_Gregorian_calendar_date_to_Julian_Day_Number

- then add days to Julian day number

- finally convert Julian day number back to (day,month,year) (Gregorian) https://en.wikipedia.org/wiki/Julian_day#Gregorian_calendar_from_Julian_day_number

long toJdn(int day, int month, int year);
void toCalendarDate(long jdn, int& day, int& month, int& year);

it's more complicate than if...else... but it is funnier this way