Addition some interval to tm structs

Question

I have one struct tm.
And I need to add some fixed interval (given in xx years, xx months, xx days) to the tm struct.
Is there any standard functio

Answer 1

The standard addition operator works.

struct tm x;
/* add 2 years and 3 days to x */
x.tm_year += 2;
x.tm_mday += 3;

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Edit: you can easily make a function

struct tm addinterval(struct tm x, int y, int m, int d) {
    x.tm_year += y;
    x.tm_mon += m;
    x.tm_mday += d;
    mktime(&x); /* normalize result */
    return x;
}

EDIT: added mktime to normalize result