// -----------------------------------------------------------------------
public boolean isLeap(long instant) {
int thisYear = iChronology.getYear(instant);
if (iChronology.isLeapYear(thisYear)) {
return (iChronology.getMonthOfYear(instant, thisYear) == iLeapMonth);
}
return false;
}
/**
* Add the specified month to the specified time instant. The amount added may be negative.
*
* <p>If the new month has less total days than the specified day of the month, this value is
* coerced to the nearest sane value. e.g.
*
* <p>07-31 - (1 month) = 06-30
*
* <p>03-31 - (1 month) = 02-28 or 02-29 depending
*
* <p>
*
* @see org.joda.time.DateTimeField#add
* @see org.joda.time.ReadWritableDateTime#addMonths(int)
* @param instant the time instant in millis to update.
* @param months the months to add (can be negative).
* @return the updated time instant.
*/
public long add(long instant, int months) {
if (months == 0) {
return instant; // the easy case
}
//
// Save time part first.
//
long timePart = iChronology.getMillisOfDay(instant);
//
//
// Get this year and month.
//
int thisYear = iChronology.getYear(instant);
int thisMonth = iChronology.getMonthOfYear(instant, thisYear);
// ----------------------------------------------------------
//
// Do not refactor without careful consideration.
// Order of calculation is important.
//
int yearToUse;
// Initially, monthToUse is zero-based
int monthToUse = thisMonth - 1 + months;
if (monthToUse >= 0) {
yearToUse = thisYear + (monthToUse / iMax);
monthToUse = (monthToUse % iMax) + 1;
} else {
yearToUse = thisYear + (monthToUse / iMax) - 1;
monthToUse = Math.abs(monthToUse);
int remMonthToUse = monthToUse % iMax;
// Take care of the boundary condition
if (remMonthToUse == 0) {
remMonthToUse = iMax;
}
monthToUse = iMax - remMonthToUse + 1;
// Take care of the boundary condition
if (monthToUse == 1) {
yearToUse += 1;
}
}
// End of do not refactor.
// ----------------------------------------------------------
//
// Quietly force DOM to nearest sane value.
//
int dayToUse = iChronology.getDayOfMonth(instant, thisYear, thisMonth);
int maxDay = iChronology.getDaysInYearMonth(yearToUse, monthToUse);
if (dayToUse > maxDay) {
dayToUse = maxDay;
}
//
// get proper date part, and return result
//
long datePart = iChronology.getYearMonthDayMillis(yearToUse, monthToUse, dayToUse);
return datePart + timePart;
}
// -----------------------------------------------------------------------
public long getDifferenceAsLong(long minuendInstant, long subtrahendInstant) {
if (minuendInstant < subtrahendInstant) {
return -getDifference(subtrahendInstant, minuendInstant);
}
int minuendYear = iChronology.getYear(minuendInstant);
int minuendMonth = iChronology.getMonthOfYear(minuendInstant, minuendYear);
int subtrahendYear = iChronology.getYear(subtrahendInstant);
int subtrahendMonth = iChronology.getMonthOfYear(subtrahendInstant, subtrahendYear);
long difference =
(minuendYear - subtrahendYear) * ((long) iMax) + minuendMonth - subtrahendMonth;
// Before adjusting for remainder, account for special case of add
// where the day-of-month is forced to the nearest sane value.
int minuendDom = iChronology.getDayOfMonth(minuendInstant, minuendYear, minuendMonth);
if (minuendDom == iChronology.getDaysInYearMonth(minuendYear, minuendMonth)) {
// Last day of the minuend month...
int subtrahendDom =
iChronology.getDayOfMonth(subtrahendInstant, subtrahendYear, subtrahendMonth);
if (subtrahendDom > minuendDom) {
// ...and day of subtrahend month is larger.
// Note: This works fine, but it ideally shouldn't invoke other
// fields from within a field.
subtrahendInstant = iChronology.dayOfMonth().set(subtrahendInstant, minuendDom);
}
}
// Inlined remainder method to avoid duplicate calls.
long minuendRem = minuendInstant - iChronology.getYearMonthMillis(minuendYear, minuendMonth);
long subtrahendRem =
subtrahendInstant - iChronology.getYearMonthMillis(subtrahendYear, subtrahendMonth);
if (minuendRem < subtrahendRem) {
difference--;
}
return difference;
}
// -----------------------------------------------------------------------
public long add(long instant, long months) {
int i_months = (int) months;
if (i_months == months) {
return add(instant, i_months);
}
// Copied from add(long, int) and modified slightly:
long timePart = iChronology.getMillisOfDay(instant);
int thisYear = iChronology.getYear(instant);
int thisMonth = iChronology.getMonthOfYear(instant, thisYear);
long yearToUse;
long monthToUse = thisMonth - 1 + months;
if (monthToUse >= 0) {
yearToUse = thisYear + (monthToUse / iMax);
monthToUse = (monthToUse % iMax) + 1;
} else {
yearToUse = thisYear + (monthToUse / iMax) - 1;
monthToUse = Math.abs(monthToUse);
int remMonthToUse = (int) (monthToUse % iMax);
if (remMonthToUse == 0) {
remMonthToUse = iMax;
}
monthToUse = iMax - remMonthToUse + 1;
if (monthToUse == 1) {
yearToUse += 1;
}
}
if (yearToUse < iChronology.getMinYear() || yearToUse > iChronology.getMaxYear()) {
throw new IllegalArgumentException("Magnitude of add amount is too large: " + months);
}
int i_yearToUse = (int) yearToUse;
int i_monthToUse = (int) monthToUse;
int dayToUse = iChronology.getDayOfMonth(instant, thisYear, thisMonth);
int maxDay = iChronology.getDaysInYearMonth(i_yearToUse, i_monthToUse);
if (dayToUse > maxDay) {
dayToUse = maxDay;
}
long datePart = iChronology.getYearMonthDayMillis(i_yearToUse, i_monthToUse, dayToUse);
return datePart + timePart;
}
/**
* Get the Month component of the specified time instant.
*
* @see org.joda.time.DateTimeField#get(long)
* @see org.joda.time.ReadableDateTime#getMonthOfYear()
* @param instant the time instant in millis to query.
* @return the month extracted from the input.
*/
public int get(long instant) {
return iChronology.getMonthOfYear(instant);
}
// -----------------------------------------------------------------------
public long roundFloor(long instant) {
int year = iChronology.getYear(instant);
int month = iChronology.getMonthOfYear(instant, year);
return iChronology.getYearMonthMillis(year, month);
}
