bool DateComponents::setMillisecondsSinceEpochForWeek(double ms) {
m_type = Invalid;
if (!std::isfinite(ms))
return false;
ms = round(ms);
m_year = msToYear(ms);
if (m_year < minimumYear() || m_year > maximumYear())
return false;
int yearDay = dayInYear(ms, m_year);
int offset = offsetTo1stWeekStart(m_year);
if (yearDay < offset) {
// The day belongs to the last week of the previous year.
m_year--;
if (m_year <= minimumYear())
return false;
m_week = maxWeekNumberInYear();
} else {
m_week = ((yearDay - offset) / 7) + 1;
if (m_week > maxWeekNumberInYear()) {
m_year++;
m_week = 1;
}
if (m_year > maximumYear() ||
(m_year == maximumYear() && m_week > maximumWeekInMaximumYear))
return false;
}
m_type = Week;
return true;
}
bool DateComponents::parseWeek(const String& src,
unsigned start,
unsigned& end) {
unsigned index;
if (!parseYear(src, start, index))
return false;
// 4 characters ('-' 'W' digit digit) are needed.
if (index + 3 >= src.length())
return false;
if (src[index] != '-')
return false;
++index;
if (src[index] != 'W')
return false;
++index;
int week;
if (!toInt(src, index, 2, week) || week < minimumWeekNumber ||
week > maxWeekNumberInYear())
return false;
if (m_year == maximumYear() && week > maximumWeekInMaximumYear)
return false;
m_week = week;
end = index + 2;
m_type = Week;
return true;
}
bool DateComponents::setWeek(int year, int weekNumber) {
m_type = Invalid;
if (year < minimumYear() || year > maximumYear())
return false;
m_year = year;
if (weekNumber < 1 || weekNumber > maxWeekNumberInYear())
return false;
m_week = weekNumber;
m_type = Week;
return true;
}
bool DateComponents::parseYear(const String& src, unsigned start, unsigned& end)
{
unsigned digitsLength = countDigits(src, start);
// Needs at least 4 digits according to the standard.
if (digitsLength < 4)
return false;
int year;
if (!toInt(src, start, digitsLength, year))
return false;
if (year < minimumYear() || year > maximumYear())
return false;
m_year = year;
end = start + digitsLength;
return true;
}
bool DateComponents::setMonthsSinceEpoch(double months) {
if (!std::isfinite(months))
return false;
months = round(months);
double doubleMonth = positiveFmod(months, 12);
double doubleYear = 1970 + (months - doubleMonth) / 12;
if (doubleYear < minimumYear() || maximumYear() < doubleYear)
return false;
int year = static_cast<int>(doubleYear);
int month = static_cast<int>(doubleMonth);
if (!withinHTMLDateLimits(year, month))
return false;
m_year = year;
m_month = month;
m_type = Month;
return true;
}