Datum
add_months(PG_FUNCTION_ARGS)
{
DateADT day = PG_GETARG_DATEADT(0);
int n = PG_GETARG_INT32(1);
int y, m, d;
int days;
DateADT result;
div_t v;
bool last_day;
j2date(day + POSTGRES_EPOCH_JDATE, &y, &m, &d);
last_day = (d == days_of_month(y, m));
v = div(y * 12 + m - 1 + n, 12);
y = v.quot;
if (y < 0)
y += 1; /* offset because of year 0 */
m = v.rem + 1;
days = days_of_month(y, m);
if (last_day || d > days)
d = days;
result = date2j(y, m, d) - POSTGRES_EPOCH_JDATE;
PG_RETURN_DATEADT (result);
}
void rtc_increase_days()
{
CCR &= ~CLKEN;
DOM++;
if (DOM > days_of_month(get_month(), get_year()))
DOM = days_of_month(get_month(), get_year());
CCR |= CLKEN;
}
bool date::is_valid(int32_t __year, int32_t __month, int32_t __day)
{
return
(__year >= 0 && __year <= 9999) &&
(__month >= 1 && __month <= 12) &&
(__day >= 1 && __day <= days_of_month(__year, __month));
}
void getCalenday(int y, int m, int calenday[][5]) {
int day;
int days = days_of_month(m,y);
for (day = 1;day <= days;day++) {
int i = getDayOfWeek(y,m,day);
int j = day / 7;
printf("i = %d,j = %d, day = %d\n", i,j,day);
calenday[i][j] = day;
}
}
int32_t date::day_of_year() const
{
int32_t __doy = 0;
for (int32_t __month = 1; __month < _month; ++__month)
{
__doy += days_of_month(_year, __month);
}
__doy += _day;
return __doy;
}
int main(void)
{
int year,month,day,numberday=0,i;
int days_of_month(int year, int month);
printf("Input year, month, day: ");scanf("%d%d%d",&year,&month,&day);
for(i=1;i<month;i++)
{
numberday+=days_of_month(year,i);
}
numberday+=day;
printf("Days of year: %d",numberday);
return 0;
}
Datum
months_between(PG_FUNCTION_ARGS)
{
DateADT date1 = PG_GETARG_DATEADT(0);
DateADT date2 = PG_GETARG_DATEADT(1);
int y1, m1, d1;
int y2, m2, d2;
float8 result;
j2date(date1 + POSTGRES_EPOCH_JDATE, &y1, &m1, &d1);
j2date(date2 + POSTGRES_EPOCH_JDATE, &y2, &m2, &d2);
/* Ignore day components for last days, or based on a 31-day month. */
if (d1 == days_of_month(y1, m1) && d2 == days_of_month(y2, m2))
result = (y1 - y2) * 12 + (m1 - m2);
else
result = (y1 - y2) * 12 + (m1 - m2) + (d1 - d2) / 31.0;
PG_RETURN_NUMERIC(
DirectFunctionCall1(float8_numeric, Float8GetDatumFast(result)));
}
void set_date(unsigned int d, unsigned int m, unsigned int y)
{
if (d > days_of_month(m, y) || m > 12 || y > 4095)
return;
CCR &= ~CLKEN;
DOM = d;
MONTH = m;
YEAR = y;
DOW = d_o_w(y, m, d);
CCR |= CLKEN;
return;
}
date& date::assign(int32_t __year, int32_t __month, int32_t __day)
{
ufc_assert (__year >= 0 && __year <= 9999);
ufc_assert (__month >= 1 && __month <= 12);
ufc_assert (__day >= 1 && __day <= days_of_month(__year, __month));
unsigned short __a = static_cast<unsigned short>((14-__month)/12);
unsigned short __y = static_cast<unsigned short>(__year + 4800 - __a);
unsigned short __m = static_cast<unsigned short>(__month + 12*__a - 3);
_date_val = __day + ((153*__m + 2)/5) + 365*__y + (__y/4) - (__y/100) + (__y/400) - 32045;
_year = __year;
_month = __month;
_day = __day;
return *this;
}
long get_diff_date1_and_date2(int y1,int m1, int d1, int y2,int m2,int d2) {
long count1 = days_of_year(y1 - 1) + m1 * days_of_month(m1 - 1, y1) + d1;
long count2 = days_of_year(y2 - 1) + m2 * days_of_month(m2 - 1, y2) + d2;
return count1 - count2;
}