/*!
\brief Get the year, month, and day in month from a week in year
\details An ISO week-numbering year has 52 or 53 full weeks (364 or 371 days)
\param year [in, out] Gregorian year
\param weekInYear [in] Gregorian week in a year
\param month [out] Gregorian month
\param dayInMonth [out] Gregorian day in month
\returns \c True if success or \c False if error
*/
bool GetDayAndMonthFromWeekInYear(int *year, int weekInYear, int *month,
int *dayInMonth)
{
int daysInMonth;
int weeksInYear;
*month = ISO_FIRST_MONTH_IN_YEAR;
bool hasChanged;
do
{
hasChanged = false;
weeksInYear = GetNumberOfWeeksInYear(*year);
if (weekInYear > weeksInYear)
{
weekInYear -= weeksInYear;
(*year)++;
hasChanged = true;
}
} while(hasChanged);
int dayInYear = (weekInYear - 1) * ISO_DAYS_A_WEEK + 1;
// Since the first day of week 1 in a year in the Gregorian calendar is not usually January 1st we need to handle the offset
static int t[] = {0, 0, -1, -2, -3, 3, 2, 1};
int jan1DayOfWeek = GetDayOfTheWeek(*year, 1, 1);
dayInYear += t[jan1DayOfWeek];
if (dayInYear <= 0)
{
// dayInYear is in the previous year
(*year)--;
dayInYear += GetDaysInYear(*year);
}
else
{
int daysInYear = GetDaysInYear(*year);
if (dayInYear > daysInYear)
{
// dayInYear is in the next year
(*year)++;
dayInYear -= daysInYear;
}
}
if (!GetDayAndMonthFromDayInYear(*year, dayInYear, month, dayInMonth))
return false;
return true;
}
int Date::ComputeDaysFromYearStart(int year, int month, int day)
{
int days=day-1;
for(int i=month;month>1;month--)
{
if(month==12)
days+=30;
else if(month==11)
days+=31;
else if(month==10)
days+=30;
else if(month==9)
days+=31;
else if(month==8)
days+=31;
else if(month==7)
days+=30;
else if(month==6)
days+=31;
else if(month==5)
days+=30;
else if(month==4)
days+=31;
else if(month==3)
{
if(GetDaysInYear(year)==366)
days+=29;
else
days+=28;
}
else if(month==2)
days+=31;
}
return days;
}
static void FirstSetYearAndDayOfYear(RtcTime * self)
{
int days = self->daysSince1980;
int year = STARTING_YEAR;
int daysInYear = GetDaysInYear(year);
while (days > daysInYear)
{
year++;
days -= daysInYear;
daysInYear = GetDaysInYear(year);
}
self->dayOfYear = days;
self->year = year;
}
CDate::CDate( int num ) {
if ( num < 0 ) {
isNull = true;
} else {
isNull = false;
year = 1;
day = 1;
month = 1;
while ( num >= GetDaysInYear( year ) ) {
num -= GetDaysInYear( year++ );
}
while ( num >= GetDaysInMonth( month, year ) ) {
num -= GetDaysInMonth( month++, year );
}
day += num;
}
}
int GetDaysFrom1984To(int day, int month, int year) {
int y;
int32 days=0;
if (year<1984) return -1;
for (y=1984; y<year;y++) {
days+=GetDaysInYear(y);
}
days+=GetDOY(day, month, year);
return days;
}
CDate::operator int() const {
if ( isNull ) {
return -1;
} else {
int i, num = 0;
for ( i=1; i<year; i++ ) {
num += GetDaysInYear( i );
}
for ( i=1; i<month; i++ ) {
num += GetDaysInMonth( i, year );
}
num += ( day - 1 );
return num;
}
}
void Date::NextDay(int n )
{
day_+=n;
bool OK=true;
while(OK)
{
if(year_%4==0&&month_==2)
{
if(year_%100!=0||year_%400==0)
{
if(day_>29)
{
month_++;
day_-=29;
}
}
if(year_%100==0)
{
if(day_>29)
{
month_++;
day_-=29;
}
}
}
if(month_==1||month_==3||month_==5||month_==7||month_==8||month_==10||month_==12)
{
if(day_>31)
{
month_++;
day_-=31;
}
if(month_>12)
{
month_=1;
year_++;
}
}
else if(month_==4||month_==6||month_==9||month_==11)
{
if(day_>30)
{
month_++;
day_-=30;
}
}
if(month_==2)
{
if(day_>28)
{
month_++;
day_-=30;
}
}
if(day_<=0)
{
if(month_!=1)
{
month_--;
if(month_==1||month_==3||month_==5||month_==7||month_==8||month_==10)
day_+=31;
else if(month_==4||month_==6||month_==9||month_==11)
day_+=30;
else if(month_==2)
{
if(GetDaysInYear(year_)==366)
day_+=29;
else
day_+=28;
}
}
if(month_==1)
{
month_=12;
year_--;
day_+=31;
}
}
if(month_==1||month_==3||month_==5||month_==7||month_==8||month_==10||month_==12)
{
if(day_<=31&&day_>0)
OK=false;
}
else if(month_==4||month_==6||month_==9||month_==11&&day_<=30&&day_>0)
{
if(day_<=30&&day_>0)
OK=false;
}
else if(month_==2&&GetDaysInYear(year_)==366)
{
if(day_<=29&&day_>0)
OK=false;
}
else if(month_==2&&GetDaysInYear(year_)==365)
{
if(day_<=28&&day_>0)
OK=false;
}
}
}
