/disk01/web/ocssw/build/src/libosmi/calday.c (r8102/r4879)

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static int days[] = {-1, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

int daysInYear(int year)
{
  if ( (year % 4 == 0 && year % 100 != 0) || year % 400 == 0 )
    return 366;
  else return 365;
}

int daysInMonth(int year, int month)
{
 if( (month==2) && (daysInYear(year)==366)) return 29;
 else return days[month];
}

int getCalDay(int year, int jday, int *month, int *day)
{
        int i,sub_days,mdays;
    sub_days = jday;
    for (i = 1; i < 13; i++) {
        mdays = daysInMonth(year,i);
        sub_days -= mdays;
        if(sub_days <= 0)
            break;
    }
    if(sub_days == 0) {
        *month = i;
        *day = daysInMonth(year,i);
    }
    else {
        *month = i;
        *day = daysInMonth(year,i) + sub_days;
    }
        return 0;
}

int getJulianDay(int year, int month, int day)
{
    int i;
    int julday = 0;
    
    if(month < 1 || month > 12)
        return -1;
    if(day < 1 || day > daysInMonth(year,month))
        return -1;
    for(i = 1; i < month; i++)
        julday += daysInMonth(year,i);
    julday += day;
    return julday;
}