1 files changed, 53 insertions, 0 deletions
diff --git a/calendar/calcs.h b/calendar/calcs.h
new file mode 100644
index 0000000000..e5e6a09b23
--- /dev/null
+++ b/calendar/calcs.h
@@ -0,0 +1,53 @@
+/* 
+ * 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;
+