Libraries for date validation in C?

I have a struct of values for a date.

struct date
{
    int day;
    int month;
    int year;
};

开发者_JS百科Are there any libraries for C for quick and easy date validation.

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The standard C library function mktime() will convert year/month/day (really a full struct tm) to a time_t, and tell you if something went wrong.