31 int days_in_year(year_t year);
32 int days_in_month(year_t year, month_t month);
33 int weeks_in_month(year_t year, month_t month);
34 wday_t start_of_month(year_t year, month_t month);
36 /* String functions */
37 const char *month_to_str(month_t month);
38 const char *month_to_string(month_t month);
39 const char *day_to_st(wday_t day);
40 const char *day_to_str(wday_t day);
41 const char *day_to_string(wday_t day);