NASA Ocean Color

ocssw V2022
 #define         IS_LEAP_YEAR(y)         ( (!((y)%4) && (y)%100) || !((y)%400) )
  
 int day2mday(int year, int day_of_year, int *month, int *day_of_month)
 /*------------------------------------------------------------------------------
    Function: day2mday
  
    Returns type: 
  
    Description: Given a year and a day of that year, determine what the month
                 and day of that month are.
  
                 This function returns 1 upon successful completion and 0
                 otherwise.
  
    Parameters: (in calling order)
       Type              Name            I/O     Description
       ----              ----            ---     -----------
       int               year            I       all 4 digits (e.g. 1985 or 2001)
       int               day_of_year     I       1 - 365 (or 366 for a leap year)
       unsigned char **  month           O       3 characters plus a terminator
       int *             day_of_month    O       # of day in month (1st day is 1)
    Modification history:
       Programmer        Date            Description of change
       ----------        ----            ---------------------
       Norman Kuring     10-Feb-1993     Original development
       W. Robinson       25-Oct-1996     modify to output integer month
  
 ------------------------------------------------------------------------------*/ {
  
     static char days_per_month[] = {
         31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
     };
  
     int date;
     int month_index;
  
     if (IS_LEAP_YEAR(year))
         days_per_month[1] = 29;
     else
         days_per_month[1] = 28;
  
     for (month_index = 0, date = day_of_year;
             date > days_per_month[month_index];
             date -= days_per_month[month_index++])
         ;
  
     if (month_index > 11)
         return ( -1);
  
     *month = month_index + 1;
     *day_of_month = date;
  
     return ( 0);
  
 }
IS_LEAP_YEAR
#define IS_LEAP_YEAR(y)
Definition: day2mday.c:1
day2mday
int day2mday(int year, int day_of_year, int *month, int *day_of_month)
Definition: day2mday.c:3