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/*
* function prototypes
*/
int days_of_february(const int year);
int is_leap_year(const int year);
int valid_date(const int day, const int month, const int year);
void get_system_date(int *day, int *month, int *year);
void prev_date(int *day, int *month, int *year);
void next_date(int *day, int *month, int *year);
int month_atoi(const char *string);
int day_atoi(const char *string);
const char *day_suffix(int day);
const char *short3_day_name(int day);
const char *short_day_name(int day);
const char *day_name(int day);
const char *short_month_name(int month);
const char *month_name(int month);
unsigned long int date2num(const int day, const int month, const int year);
int weekday_of_date(const int day, const int month, const int year);
/*
* Important preprocessor symbols for the internal ranges.
*/
#define DAY_LAST 365 /* Last day in a NON leap year */
#define DAY_MIN 1 /* Minimum day of week/month/year */
#define DAY_MAX 7 /* Maximum day/amount of days of week */
#define WEEK_MAX 52 /* Maximum week number of year */
#define MONTH_LAST 31 /* Highest day number in a month */
#define MONTH_MIN 1 /* Minimum month of year */
#define MONTH_MAX 12 /* Maximum month of year */
#define YEAR_MIN 1 /* Minimum year able to compute */
#define YEAR_MAX 9999 /* Maximum year able to compute */
#define EASTER_MIN 30 /* Minimum year for computing Easter Sunday (29+1) */
#define EASTER_MAX YEAR_MAX /* Maximum year for computing Easter Sunday */
#define MONTH_COLS 6 /* Maximum number of columns of a month */
#define VEC_BLOCK 42 /* Maximum number of elements per month (7*6) */
#define VEC_ELEMS 504 /* Maximum number of elements per year (42*12) */
#define CENTURY 1900 /* Operating system standard starting century, DON'T change ! */
/*
* The Gregorian Reformation date record.
*/
typedef
struct greg_type
{
int year; /* Year of Gregorian Reformation */
int month; /* Month of Gregorian Reformation */
int first_day; /* First missing day of Reformation period */
int last_day; /* Last missing day of Reformation period */
}
Greg_struct;
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