package java.time;
import static java.time.LocalTime.SECONDS_PER_DAY;
import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_MONTH;
import static java.time.temporal.ChronoField.ALIGNED_DAY_OF_WEEK_IN_YEAR;
import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_MONTH;
import static java.time.temporal.ChronoField.ALIGNED_WEEK_OF_YEAR;
import static java.time.temporal.ChronoField.DAY_OF_MONTH;
import static java.time.temporal.ChronoField.DAY_OF_YEAR;
import static java.time.temporal.ChronoField.EPOCH_DAY;
import static java.time.temporal.ChronoField.ERA;
import static java.time.temporal.ChronoField.MONTH_OF_YEAR;
import static java.time.temporal.ChronoField.PROLEPTIC_MONTH;
import static java.time.temporal.ChronoField.YEAR;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InvalidObjectException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.time.chrono.ChronoLocalDate;
import java.time.chrono.Era;
import java.time.chrono.IsoChronology;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;
import java.time.temporal.ChronoField;
import java.time.temporal.ChronoUnit;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAccessor;
import java.time.temporal.TemporalAdjuster;
import java.time.temporal.TemporalAmount;
import java.time.temporal.TemporalField;
import java.time.temporal.TemporalQueries;
import java.time.temporal.TemporalQuery;
import java.time.temporal.TemporalUnit;
import java.time.temporal.UnsupportedTemporalTypeException;
import java.time.temporal.ValueRange;
import java.time.zone.ZoneOffsetTransition;
import java.time.zone.ZoneRules;
import java.util.Objects;
/**
* ISO-8601标准
* 示例{@code 2007-12-03}
* @since 1.8
*/
public final class LocalDate
implements Temporal, TemporalAdjuster, ChronoLocalDate, Serializable {
/**
* 最小的LocalDate日期 '-999999999-01-01'.
* 表示过去很久
*/
public static final LocalDate MIN = LocalDate.of(Year.MIN_VALUE, 1, 1);
/**
* 最大的LocalDate日期'+999999999-12-31'
* 表示很久以后
*/
public static final LocalDate MAX = LocalDate.of(Year.MAX_VALUE, 12, 31);
/**
* Serialization version.
*/
private static final long serialVersionUID = 2942565459149668126L;
/**
* 400年是一个循环 共146097天
*/
private static final int DAYS_PER_CYCLE = 146097;
/**
* 计算0000-1970年共多少天，这里倒过来算即先算2000年的再回退30年
*/
static final long DAYS_0000_TO_1970 = (DAYS_PER_CYCLE * 5L) - (30L * 365L + 7L);
/**
* The year.
*/
private final int year;
/**
* The month-of-year.
*/
private final short month;
/**
* The day-of-month.
*/
private final short day;
//-----------------------------------------------------------------------
/**
* 获取本地系统时钟的时区
*/
public static LocalDate now() {
return now(Clock.systemDefaultZone());
}
/**
* 使用特定时区
*/
public static LocalDate now(ZoneId zone) {
return now(Clock.system(zone));
}
/**
* 获取当前日期，传入参数clock
*/
public static LocalDate now(Clock clock) {
Objects.requireNonNull(clock, "clock");
// inline to avoid creating object and Instant checks
final Instant now = clock.instant(); // called once
ZoneOffset offset = clock.getZone().getRules().getOffset(now);
long epochSec = now.getEpochSecond() + offset.getTotalSeconds(); // overflow caught later
long epochDay = Math.floorDiv(epochSec, SECONDS_PER_DAY);
return LocalDate.ofEpochDay(epochDay);
}
//-----------------------------------------------------------------------
/**
*用特定的年月日返回LocalDate,这里月份是Month类型，也就是英文的JUNE,MAY那些
*/
public static LocalDate of(int year, Month month, int dayOfMonth) {
YEAR.checkValidValue(year);
Objects.requireNonNull(month, "month");
DAY_OF_MONTH.checkValidValue(dayOfMonth);
return create(year, month.getValue(), dayOfMonth);
}
/**
*用特定的年月日返回LocalDate
*/
public static LocalDate of(int year, int month, int dayOfMonth) {
YEAR.checkValidValue(year);
MONTH_OF_YEAR.checkValidValue(month);
DAY_OF_MONTH.checkValidValue(dayOfMonth);
return create(year, month, dayOfMonth);
}
//-----------------------------------------------------------------------
/**
*用年和一年中的第几天来返回LocalDate
*/
public static LocalDate ofYearDay(int year, int dayOfYear) {
YEAR.checkValidValue(year);
DAY_OF_YEAR.checkValidValue(dayOfYear);
boolean leap = IsoChronology.INSTANCE.isLeapYear(year);
if (dayOfYear == 366 && leap == false) {
throw new DateTimeException("Invalid date 'DayOfYear 366' as '" + year + "' is not a leap year");
}
Month moy = Month.of((dayOfYear - 1) / 31 + 1);
int monthEnd = moy.firstDayOfYear(leap) + moy.length(leap) - 1;
if (dayOfYear > monthEnd) {
moy = moy.plus(1);
}
int dom = dayOfYear - moy.firstDayOfYear(leap) + 1;
return new LocalDate(year, moy.getValue(), dom);
}
//-----------------------------------------------------------------------
/**
* 用纪元时间来返回LocalDate。就是从1970-01-01
*/
public static LocalDate ofEpochDay(long epochDay) {
long zeroDay = epochDay + DAYS_0000_TO_1970;
// find the march-based year
zeroDay -= 60; // adjust to 0000-03-01 so leap day is at end of four year cycle
long adjust = 0;
if (zeroDay < 0) {
// adjust negative years to positive for calculation
long adjustCycles = (zeroDay + 1) / DAYS_PER_CYCLE - 1;
adjust = adjustCycles * 400;
zeroDay += -adjustCycles * DAYS_PER_CYCLE;
}
long yearEst = (400 * zeroDay + 591) / DAYS_PER_CYCLE;
long doyEst = zeroDay - (365 * yearEst + yearEst / 4 - yearEst / 100 + yearEst / 400);
if (doyEst < 0) {
// fix estimate
yearEst--;
doyEst = zeroDay - (365 * yearEst + yearEst / 4 - yearEst / 100 + yearEst / 400);
}
yearEst += adjust; // reset any negative year
int marchDoy0 = (int) doyEst;
// convert march-based values back to january-based
int marchMonth0 = (marchDoy0 * 5 + 2) / 153;
int month = (marchMonth0 + 2) % 12 + 1;
int dom = marchDoy0 - (marchMonth0 * 306 + 5) / 10 + 1;
yearEst += marchMonth0 / 10;
// check year now we are certain it is correct
int year = YEAR.checkValidIntValue(yearEst);
return new LocalDate(year, month, dom);
}
//-----------------------------------------------------------------------
/**
*
*/
public static LocalDate from(TemporalAccessor temporal) {
Objects.requireNonNull(temporal, "temporal");
LocalDate date = temporal.query(TemporalQueries.localDate());
if (date == null) {
throw new DateTimeException("Unable to obtain LocalDate from TemporalAccessor: " +
temporal + " of type " + temporal.getClass().getName());
}
return date;
}
//-----------------------------------------------------------------------
/**
* 解析像 {@code 2007-12-03} 格式的为LocalDate.实际底层封装了DateTimeFormatter.ISO_LOCAL_DATE格式也就是2007-12-03这种
*/
public static LocalDate parse(CharSequence text) {
return parse(text, DateTimeFormatter.ISO_LOCAL_DATE);
}
/**
* 传入一直预定义的DateTimeFormatter格式，进行解析返回LocalDate.可查看相关
*/
public static LocalDate parse(CharSequence text, DateTimeFormatter formatter) {
Objects.requireNonNull(formatter, "formatter");
return formatter.parse(text, LocalDate::from);
}
//-----------------------------------------------------------------------
/**
*私有方法返回传入年月日参数的LocalDate
*/
private static LocalDate create(int year, int month, int dayOfMonth) {
if (dayOfMonth > 28) {
int dom = 31;
switch (month) {
case 2:
dom = (IsoChronology.INSTANCE.isLeapYear(year) ? 29 : 28);
break;
case 4:
case 6:
case 9:
case 11:
dom = 30;
break;
}
if (dayOfMonth > dom) {
if (dayOfMonth == 29) {
throw new DateTimeException("Invalid date 'February 29' as '" + year + "' is not a leap year");
} else {
throw new DateTimeException("Invalid date '" + Month.of(month).name() + " " + dayOfMonth + "'");
}
}
}
return new LocalDate(year, month, dayOfMonth);
}
/**
* 判断传递的日期是否合理
*/
private static LocalDate resolvePreviousValid(int year, int month, int day) {
switch (month) {
case 2:
day = Math.min(day, IsoChronology.INSTANCE.isLeapYear(year) ? 29 : 28);
break;
case 4:
case 6:
case 9:
case 11:
day = Math.min(day, 30);
break;
}
return new LocalDate(year, month, day);
}
/**
* 私有的构造函数
*/
private LocalDate(int year, int month, int dayOfMonth) {
this.year = year;
this.month = (short) month;
this.day = (short) dayOfMonth;
}
//-----------------------------------------------------------------------
/**
* 检查特定的变量是否被支持，以下是支持的种类：
* <ul>
* <li>{@code DAY_OF_WEEK}
* <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH}
* <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR}
* <li>{@code DAY_OF_MONTH}
* <li>{@code DAY_OF_YEAR}
* <li>{@code EPOCH_DAY}
* <li>{@code ALIGNED_WEEK_OF_MONTH}
* <li>{@code ALIGNED_WEEK_OF_YEAR}
* <li>{@code MONTH_OF_YEAR}
* <li>{@code PROLEPTIC_MONTH}
* <li>{@code YEAR_OF_ERA}
* <li>{@code YEAR}
* <li>{@code ERA}
* </ul>
*对于非以上种类返回false
*/
@Override // override for Javadoc
public boolean isSupported(TemporalField field) {
return ChronoLocalDate.super.isSupported(field);
}
/**
* 检查特定的unit是否支持，如果不支持在进行plus，minus方法时会抛出异常
* 支持的单元有：
* <ul>
* <li>{@code DAYS}
* <li>{@code WEEKS}
* <li>{@code MONTHS}
* <li>{@code YEARS}
* <li>{@code DECADES}
* <li>{@code CENTURIES}
* <li>{@code MILLENNIA}
* <li>{@code ERAS}
* </ul>
* 其他类型会返回false
*/
@Override // override for Javadoc
public boolean isSupported(TemporalUnit unit) {
return ChronoLocalDate.super.isSupported(unit);
}
//-----------------------------------------------------------------------
/**
* 获取特定变量的合法值
*/
@Override
public ValueRange range(TemporalField field) {
if (field instanceof ChronoField) {
ChronoField f = (ChronoField) field;
if (f.isDateBased()) {
switch (f) {
case DAY_OF_MONTH: return ValueRange.of(1, lengthOfMonth());
case DAY_OF_YEAR: return ValueRange.of(1, lengthOfYear());
case ALIGNED_WEEK_OF_MONTH: return ValueRange.of(1, getMonth() == Month.FEBRUARY && isLeapYear() == false ? 4 : 5);
case YEAR_OF_ERA:
return (getYear() <= 0 ? ValueRange.of(1, Year.MAX_VALUE + 1) : ValueRange.of(1, Year.MAX_VALUE));
}
return field.range();
}
throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
}
return field.rangeRefinedBy(this);
}
/**
* 从特定的变量中取值返回int类型
*/
@Override // override for Javadoc and performance
public int get(TemporalField field) {
if (field instanceof ChronoField) {
return get0(field);
}
return ChronoLocalDate.super.get(field);
}
/**
* 从特定的变量中取值返回long类型
*/
@Override
public long getLong(TemporalField field) {
if (field instanceof ChronoField) {
if (field == EPOCH_DAY) {
return toEpochDay();
}
if (field == PROLEPTIC_MONTH) {
return getProlepticMonth();
}
return get0(field);
}
return field.getFrom(this);
}
private int get0(TemporalField field) {
switch ((ChronoField) field) {
case DAY_OF_WEEK: return getDayOfWeek().getValue();
case ALIGNED_DAY_OF_WEEK_IN_MONTH: return ((day - 1) % 7) + 1;
case ALIGNED_DAY_OF_WEEK_IN_YEAR: return ((getDayOfYear() - 1) % 7) + 1;
case DAY_OF_MONTH: return day;
case DAY_OF_YEAR: return getDayOfYear();
case EPOCH_DAY: throw new UnsupportedTemporalTypeException("Invalid field 'EpochDay' for get() method, use getLong() instead");
case ALIGNED_WEEK_OF_MONTH: return ((day - 1) / 7) + 1;
case ALIGNED_WEEK_OF_YEAR: return ((getDayOfYear() - 1) / 7) + 1;
case MONTH_OF_YEAR: return month;
case PROLEPTIC_MONTH: throw new UnsupportedTemporalTypeException("Invalid field 'ProlepticMonth' for get() method, use getLong() instead");
case YEAR_OF_ERA: return (year >= 1 ? year : 1 - year);
case YEAR: return year;
case ERA: return (year >= 1 ? 1 : 0);
}
throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
}
private long getProlepticMonth() {
return (year * 12L + month - 1);
}
//-----------------------------------------------------------------------
/**
* 获取数据的年表，ISO日历系统标准
*/
@Override
public IsoChronology getChronology() {
return IsoChronology.INSTANCE;
}
/**
* 获取时间的era，像BE.AD这些（公元，公元前...）
*/
@Override // override for Javadoc
public Era getEra() {
return ChronoLocalDate.super.getEra();
}
/**
* 获取年
*/
public int getYear() {
return year;
}
/**
* 获取月份
*/
public int getMonthValue() {
return month;
}
/**
* 获取英文的那种月份
*/
public Month getMonth() {
return Month.of(month);
}
/**
* 获取日
*/
public int getDayOfMonth() {
return day;
}
/**
* 获取一年中的第几天
*/
public int getDayOfYear() {
return getMonth().firstDayOfYear(isLeapYear()) + day - 1;
}
/**
* 获取1周中的第几天
*/
public DayOfWeek getDayOfWeek() {
int dow0 = (int)Math.floorMod(toEpochDay() + 3, 7);
return DayOfWeek.of(dow0 + 1);
}
//-----------------------------------------------------------------------
/**
* 判断是否是闰年
*/
@Override // override for Javadoc and performance
public boolean isLeapYear() {
return IsoChronology.INSTANCE.isLeapYear(year);
}
/**
* 返回月份的长度
*/
@Override
public int lengthOfMonth() {
switch (month) {
case 2:
return (isLeapYear() ? 29 : 28);
case 4:
case 6:
case 9:
case 11:
return 30;
default:
return 31;
}
}
/**
* 返回年的长度
public int lengthOfYear() {
return (isLeapYear() ? 366 : 365);
}
//-----------------------------------------------------------------------
/**
* 返回一个调整过的LocalDate类型，这些adjuster是预定义的
*/
@Override
public LocalDate with(TemporalAdjuster adjuster) {
// optimizations
if (adjuster instanceof LocalDate) {
return (LocalDate) adjuster;
}
return (LocalDate) adjuster.adjustInto(this);
}
/**
* 返回一个调整过的LocalDate类型，这些adjuster是预定义的，传入一个新的值
* <ul>
* <li>{@code DAY_OF_WEEK} -
* Returns a {@code LocalDate} with the specified day-of-week.
* The date is adjusted up to 6 days forward or backward within the boundary
* of a Monday to Sunday week.
* <li>{@code ALIGNED_DAY_OF_WEEK_IN_MONTH} -
* Returns a {@code LocalDate} with the specified aligned-day-of-week.
* The date is adjusted to the specified month-based aligned-day-of-week.
* Aligned weeks are counted such that the first week of a given month starts
* on the first day of that month.
* This may cause the date to be moved up to 6 days into the following month.
* <li>{@code ALIGNED_DAY_OF_WEEK_IN_YEAR} -
* Returns a {@code LocalDate} with the specified aligned-day-of-week.
* The date is adjusted to the specified year-based aligned-day-of-week.
* Aligned weeks are counted such that the first week of a given year starts
* on the first day of that year.
* This may cause the date to be moved up to 6 days into the following year.
* <li>{@code DAY_OF_MONTH} -
* Returns a {@code LocalDate} with the specified day-of-month.
* The month and year will be unchanged. If the day-of-month is invalid for the
* year and month, then a {@code DateTimeException} is thrown.
* <li>{@code DAY_OF_YEAR} -
* Returns a {@code LocalDate} with the specified day-of-year.
* The year will be unchanged. If the day-of-year is invalid for the
* year, then a {@code DateTimeException} is thrown.
* <li>{@code EPOCH_DAY} -
* Returns a {@code LocalDate} with the specified epoch-day.
* This completely replaces the date and is equivalent to {@link #ofEpochDay(long)}.
* <li>{@code ALIGNED_WEEK_OF_MONTH} -
* Returns a {@code LocalDate} with the specified aligned-week-of-month.
* Aligned weeks are counted such that the first week of a given month starts
* on the first day of that month.
* This adjustment moves the date in whole week chunks to match the specified week.
* The result will have the same day-of-week as this date.
* This may cause the date to be moved into the following month.
* <li>{@code ALIGNED_WEEK_OF_YEAR} -
* Returns a {@code LocalDate} with the specified aligned-week-of-year.
* Aligned weeks are counted such that the first week of a given year starts
* on the first day of that year.
* This adjustment moves the date in whole week chunks to match the specified week.
* The result will have the same day-of-week as this date.
* This may cause the date to be moved into the following year.
* <li>{@code MONTH_OF_YEAR} -
* Returns a {@code LocalDate} with the specified month-of-year.
* The year will be unchanged. The day-of-month will also be unchanged,
* unless it would be invalid for the new month and year. In that case, the
* day-of-month is adjusted to the maximum valid value for the new month and year.
* <li>{@code PROLEPTIC_MONTH} -
* Returns a {@code LocalDate} with the specified proleptic-month.
* The day-of-month will be unchanged, unless it would be invalid for the new month
* and year. In that case, the day-of-month is adjusted to the maximum valid value
* for the new month and year.
* <li>{@code YEAR_OF_ERA} -
* Returns a {@code LocalDate} with the specified year-of-era.
* The era and month will be unchanged. The day-of-month will also be unchanged,
* unless it would be invalid for the new month and year. In that case, the
* day-of-month is adjusted to the maximum valid value for the new month and year.
* <li>{@code YEAR} -
* Returns a {@code LocalDate} with the specified year.
* The month will be unchanged. The day-of-month will also be unchanged,
* unless it would be invalid for the new month and year. In that case, the
* day-of-month is adjusted to the maximum valid value for the new month and year.
* <li>{@code ERA} -
* Returns a {@code LocalDate} with the specified era.
* The year-of-era and month will be unchanged. The day-of-month will also be unchanged,
* unless it would be invalid for the new month and year. In that case, the
* day-of-month is adjusted to the maximum valid value for the new month and year.
* </ul>
*/
@Override
public LocalDate with(TemporalField field, long newValue) {
if (field instanceof ChronoField) {
ChronoField f = (ChronoField) field;
f.checkValidValue(newValue);
switch (f) {
case DAY_OF_WEEK: return plusDays(newValue - getDayOfWeek().getValue());
case ALIGNED_DAY_OF_WEEK_IN_MONTH: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_MONTH));
case ALIGNED_DAY_OF_WEEK_IN_YEAR: return plusDays(newValue - getLong(ALIGNED_DAY_OF_WEEK_IN_YEAR));
case DAY_OF_MONTH: return withDayOfMonth((int) newValue);
case DAY_OF_YEAR: return withDayOfYear((int) newValue);
case EPOCH_DAY: return LocalDate.ofEpochDay(newValue);
case ALIGNED_WEEK_OF_MONTH: return plusWeeks(newValue - getLong(ALIGNED_WEEK_OF_MONTH));
case ALIGNED_WEEK_OF_YEAR: return plusWeeks(newValue - getLong(ALIGNED_WEEK_OF_YEAR));
case MONTH_OF_YEAR: return withMonth((int) newValue);
case PROLEPTIC_MONTH: return plusMonths(newValue - getProlepticMonth());
case YEAR_OF_ERA: return withYear((int) (year >= 1 ? newValue : 1 - newValue));
case YEAR: return withYear((int) newValue);
case ERA: return (getLong(ERA) == newValue ? this : withYear(1 - year));
}
throw new UnsupportedTemporalTypeException("Unsupported field: " + field);
}
return field.adjustInto(this, newValue);
}
//-----------------------------------------------------------------------
/**
* 改年返回新的LocalDate
*/
public LocalDate withYear(int year) {
if (this.year == year) {
return this;
}
YEAR.checkValidValue(year);
return resolvePreviousValid(year, month, day);
}
/**
* 改月返回新的LocalDate
*/
public LocalDate withMonth(int month) {
if (this.month == month) {
return this;
}
MONTH_OF_YEAR.checkValidValue(month);
return resolvePreviousValid(year, month, day);
}
/**
*改日返回新的LocalDate
*/
public LocalDate withDayOfMonth(int dayOfMonth) {
if (this.day == dayOfMonth) {
return this;
}
return of(year, month, dayOfMonth);
}
/**
* 改一年中第几日返回新的LocalDate
*/
public LocalDate withDayOfYear(int dayOfYear) {
if (this.getDayOfYear() == dayOfYear) {
return this;
}
return ofYearDay(year, dayOfYear);
}
//-----------------------------------------------------------------------
/**
* 返回新的LocalDate，在原值上进行 加 操作
*/
@Override
public LocalDate plus(TemporalAmount amountToAdd) {
if (amountToAdd instanceof Period) {
Period periodToAdd = (Period) amountToAdd;
return plusMonths(periodToAdd.toTotalMonths()).plusDays(periodToAdd.getDays());
}
Objects.requireNonNull(amountToAdd, "amountToAdd");
return (LocalDate) amountToAdd.addTo(this);
}
/**
* 返回新的LocalDate，在原值上进行 加 操作
* <ul>
* <li>{@code DAYS} -
* Returns a {@code LocalDate} with the specified number of days added.
* This is equivalent to {@link #plusDays(long)}.
* <li>{@code WEEKS} -
* Returns a {@code LocalDate} with the specified number of weeks added.
* This is equivalent to {@link #plusWeeks(long)} and uses a 7 day week.
* <li>{@code MONTHS} -
* Returns a {@code LocalDate} with the specified number of months added.
* This is equivalent to {@link #plusMonths(long)}.
* The day-of-month will be unchanged unless it would be invalid for the new
* month and year. In that case, the day-of-month is adjusted to the maximum
* valid value for the new month and year.
* <li>{@code YEARS} -
* Returns a {@code LocalDate} with the specified number of years added.
* This is equivalent to {@link #plusYears(long)}.
* The day-of-month will be unchanged unless it would be invalid for the new
* month and year. In that case, the day-of-month is adjusted to the maximum
* valid value for the new month and year.
* <li>{@code DECADES} -
* Returns a {@code LocalDate} with the specified number of decades added.
* This is equivalent to calling {@link #plusYears(long)} with the amount
* multiplied by 10.
* The day-of-month will be unchanged unless it would be invalid for the new
* month and year. In that case, the day-of-month is adjusted to the maximum
* valid value for the new month and year.
* <li>{@code CENTURIES} -
* Returns a {@code LocalDate} with the specified number of centuries added.
* This is equivalent to calling {@link #plusYears(long)} with the amount
* multiplied by 100.
* The day-of-month will be unchanged unless it would be invalid for the new
* month and year. In that case, the day-of-month is adjusted to the maximum
* valid value for the new month and year.
* <li>{@code MILLENNIA} -
* Returns a {@code LocalDate} with the specified number of millennia added.
* This is equivalent to calling {@link #plusYears(long)} with the amount
* multiplied by 1,000.
* The day-of-month will be unchanged unless it would be invalid for the new
* month and year. In that case, the day-of-month is adjusted to the maximum
* valid value for the new month and year.
* <li>{@code ERAS} -
* Returns a {@code LocalDate} with the specified number of eras added.
* Only two eras are supported so the amount must be one, zero or minus one.
* If the amount is non-zero then the year is changed such that the year-of-era
* is unchanged.
* The day-of-month will be unchanged unless it would be invalid for the new
* month and year. In that case, the day-of-month is adjusted to the maximum
* valid value for the new month and year.
* </ul>
* <p>
*/
@Override
public LocalDate plus(long amountToAdd, TemporalUnit unit) {
if (unit instanceof ChronoUnit) {
ChronoUnit f = (ChronoUnit) unit;
switch (f) {
case DAYS: return plusDays(amountToAdd);
case WEEKS: return plusWeeks(amountToAdd);
case MONTHS: return plusMonths(amountToAdd);
case YEARS: return plusYears(amountToAdd);
case DECADES: return plusYears(Math.multiplyExact(amountToAdd, 10));
case CENTURIES: return plusYears(Math.multiplyExact(amountToAdd, 100));
case MILLENNIA: return plusYears(Math.multiplyExact(amountToAdd, 1000));
case ERAS: return with(ERA, Math.addExact(getLong(ERA), amountToAdd));
}
throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
}
return unit.addTo(this, amountToAdd);
}
//-----------------------------------------------------------------------
/**
* 在原本基础上对年添加传入值后返回一个LocalDate
*/
public LocalDate plusYears(long yearsToAdd) {
if (yearsToAdd == 0) {
return this;
}
int newYear = YEAR.checkValidIntValue(year + yearsToAdd); // safe overflow
return resolvePreviousValid(newYear, month, day);
}
/**
* 在原本基础上对月添加传入值后返回一个LocalDate
*/
public LocalDate plusMonths(long monthsToAdd) {
if (monthsToAdd == 0) {
return this;
}
long monthCount = year * 12L + (month - 1);
long calcMonths = monthCount + monthsToAdd; // safe overflow
int newYear = YEAR.checkValidIntValue(Math.floorDiv(calcMonths, 12));
int newMonth = (int)Math.floorMod(calcMonths, 12) + 1;
return resolvePreviousValid(newYear, newMonth, day);
}
/**
* 在原本基础上对周添加传入值后返回一个LocalDate，底层调用的是加7天
*/
public LocalDate plusWeeks(long weeksToAdd) {
return plusDays(Math.multiplyExact(weeksToAdd, 7));
}
/**
* 在原本基础上对日添加传入值后返回一个LocalDate
*/
public LocalDate plusDays(long daysToAdd) {
if (daysToAdd == 0) {
return this;
}
long mjDay = Math.addExact(toEpochDay(), daysToAdd);
return LocalDate.ofEpochDay(mjDay);
}
//-----------------------------------------------------------------------
/**
* 减，底层调用的还是plus相关的方法，传入的是实际上是负值
*/
@Override
public LocalDate minus(TemporalAmount amountToSubtract) {
if (amountToSubtract instanceof Period) {
Period periodToSubtract = (Period) amountToSubtract;
return minusMonths(periodToSubtract.toTotalMonths()).minusDays(periodToSubtract.getDays());
}
Objects.requireNonNull(amountToSubtract, "amountToSubtract");
return (LocalDate) amountToSubtract.subtractFrom(this);
}
@Override
public LocalDate minus(long amountToSubtract, TemporalUnit unit) {
return (amountToSubtract == Long.MIN_VALUE ? plus(Long.MAX_VALUE, unit).plus(1, unit) : plus(-amountToSubtract, unit));
}
public LocalDate minusYears(long yearsToSubtract) {
return (yearsToSubtract == Long.MIN_VALUE ? plusYears(Long.MAX_VALUE).plusYears(1) : plusYears(-yearsToSubtract));
}
public LocalDate minusMonths(long monthsToSubtract) {
return (monthsToSubtract == Long.MIN_VALUE ? plusMonths(Long.MAX_VALUE).plusMonths(1) : plusMonths(-monthsToSubtract));
}
public LocalDate minusWeeks(long weeksToSubtract) {
return (weeksToSubtract == Long.MIN_VALUE ? plusWeeks(Long.MAX_VALUE).plusWeeks(1) : plusWeeks(-weeksToSubtract));
}
public LocalDate minusDays(long daysToSubtract) {
return (daysToSubtract == Long.MIN_VALUE ? plusDays(Long.MAX_VALUE).plusDays(1) : plusDays(-daysToSubtract));
}
//-----------------------------------------------------------------------
/**
* 特定查询
*/
@SuppressWarnings("unchecked")
@Override
public <R> R query(TemporalQuery<R> query) {
if (query == TemporalQueries.localDate()) {
return (R) this;
}
return ChronoLocalDate.super.query(query);
}
/**
*
* <pre>
* // 下面两种是相同的，但推荐第二种
* temporal = thisLocalDate.adjustInto(temporal);
* temporal = temporal.with(thisLocalDate);
* </pre>
*
*/
@Override // override for Javadoc
public Temporal adjustInto(Temporal temporal) {
return ChronoLocalDate.super.adjustInto(temporal);
}
/**
* Calculates the amount of time until another date in terms of the specified unit.
* <p>
* This calculates the amount of time between two {@code LocalDate}
* objects in terms of a single {@code TemporalUnit}.
* The start and end points are {@code this} and the specified date.
* The result will be negative if the end is before the start.
* The {@code Temporal} passed to this method is converted to a
* {@code LocalDate} using {@link #from(TemporalAccessor)}.
* For example, the amount in days between two dates can be calculated
* using {@code startDate.until(endDate, DAYS)}.
* <p>
* The calculation returns a whole number, representing the number of
* complete units between the two dates.
* For example, the amount in months between 2012-06-15 and 2012-08-14
* will only be one month as it is one day short of two months.
* <p>
* There are two equivalent ways of using this method.
* The first is to invoke this method.
* The second is to use {@link TemporalUnit#between(Temporal, Temporal)}:
* <pre>
* // these two lines are equivalent
* amount = start.until(end, MONTHS);
* amount = MONTHS.between(start, end);
* </pre>
* The choice should be made based on which makes the code more readable.
* <p>
* The calculation is implemented in this method for {@link ChronoUnit}.
* The units {@code DAYS}, {@code WEEKS}, {@code MONTHS}, {@code YEARS},
* {@code DECADES}, {@code CENTURIES}, {@code MILLENNIA} and {@code ERAS}
* are supported. Other {@code ChronoUnit} values will throw an exception.
* <p>
* If the unit is not a {@code ChronoUnit}, then the result of this method
* is obtained by invoking {@code TemporalUnit.between(Temporal, Temporal)}
* passing {@code this} as the first argument and the converted input temporal
* as the second argument.
* <p>
* This instance is immutable and unaffected by this method call.
*
* @param endExclusive the end date, exclusive, which is converted to a {@code LocalDate}, not null
* @param unit the unit to measure the amount in, not null
* @return the amount of time between this date and the end date
* @throws DateTimeException if the amount cannot be calculated, or the end
* temporal cannot be converted to a {@code LocalDate}
* @throws UnsupportedTemporalTypeException if the unit is not supported
* @throws ArithmeticException if numeric overflow occurs
*/
@Override
public long until(Temporal endExclusive, TemporalUnit unit) {
LocalDate end = LocalDate.from(endExclusive);
if (unit instanceof ChronoUnit) {
switch ((ChronoUnit) unit) {
case DAYS: return daysUntil(end);
case WEEKS: return daysUntil(end) / 7;
case MONTHS: return monthsUntil(end);
case YEARS: return monthsUntil(end) / 12;
case DECADES: return monthsUntil(end) / 120;
case CENTURIES: return monthsUntil(end) / 1200;
case MILLENNIA: return monthsUntil(end) / 12000;
case ERAS: return end.getLong(ERA) - getLong(ERA);
}
throw new UnsupportedTemporalTypeException("Unsupported unit: " + unit);
}
return unit.between(this, end);
}
long daysUntil(LocalDate end) {
return end.toEpochDay() - toEpochDay(); // no overflow
}
private long monthsUntil(LocalDate end) {
long packed1 = getProlepticMonth() * 32L + getDayOfMonth(); // no overflow
long packed2 = end.getProlepticMonth() * 32L + end.getDayOfMonth(); // no overflow
return (packed2 - packed1) / 32;
}
/**
* Calculates the period between this date and another date as a {@code Period}.
* <p>
* This calculates the period between two dates in terms of years, months and days.
* The start and end points are {@code this} and the specified date.
* The result will be negative if the end is before the start.
* The negative sign will be the same in each of year, month and day.
* <p>
* The calculation is performed using the ISO calendar system.
* If necessary, the input date will be converted to ISO.
* <p>
* The start date is included, but the end date is not.
* The period is calculated by removing complete months, then calculating
* the remaining number of days, adjusting to ensure that both have the same sign.
* The number of months is then normalized into years and months based on a 12 month year.
* A month is considered to be complete if the end day-of-month is greater
* than or equal to the start day-of-month.
* For example, from {@code 2010-01-15} to {@code 2011-03-18} is "1 year, 2 months and 3 days".
* <p>
* There are two equivalent ways of using this method.
* The first is to invoke this method.
* The second is to use {@link Period#between(LocalDate, LocalDate)}:
* <pre>
* // these two lines are equivalent
* period = start.until(end);
* period = Period.between(start, end);
* </pre>
* The choice should be made based on which makes the code more readable.
*
* @param endDateExclusive the end date, exclusive, which may be in any chronology, not null
* @return the period between this date and the end date, not null
*/
@Override
public Period until(ChronoLocalDate endDateExclusive) {
LocalDate end = LocalDate.from(endDateExclusive);
long totalMonths = end.getProlepticMonth() - this.getProlepticMonth(); // safe
int days = end.day - this.day;
if (totalMonths > 0 && days < 0) {
totalMonths--;
LocalDate calcDate = this.plusMonths(totalMonths);
days = (int) (end.toEpochDay() - calcDate.toEpochDay()); // safe
} else if (totalMonths < 0 && days > 0) {
totalMonths++;
days -= end.lengthOfMonth();
}
long years = totalMonths / 12; // safe
int months = (int) (totalMonths % 12); // safe
return Period.of(Math.toIntExact(years), months, days);
}
/**
* 用特定的格式格式化日期
*/
@Override // override for Javadoc and performance
public String format(DateTimeFormatter formatter) {
Objects.requireNonNull(formatter, "formatter");
return formatter.format(this);
}
//-----------------------------------------------------------------------
/**
* 结合时间格式LocalTime，返回一个LocalDateTime对象
*/
@Override
public LocalDateTime atTime(LocalTime time) {
return LocalDateTime.of(this, time);
}
/**
* 结合时间格式： 时 分，返回一个LocalDateTime对象
*/
public LocalDateTime atTime(int hour, int minute) {
return atTime(LocalTime.of(hour, minute));
}
/**
* 结合时分秒，返回一个LocalDateTime对象
*/
public LocalDateTime atTime(int hour, int minute, int second) {
return atTime(LocalTime.of(hour, minute, second));
}
/**
* 结合时分秒 纳秒，返回一个LocalDateTime对象
*/
public LocalDateTime atTime(int hour, int minute, int second, int nanoOfSecond) {
return atTime(LocalTime.of(hour, minute, second, nanoOfSecond));
}
/**
* 结合一个OffsetTime格式，返回一个OffsetTime对象。OffsetTime表示具有相对于UTC的固定区偏移的时间。
*/
public OffsetDateTime atTime(OffsetTime time) {
return OffsetDateTime.of(LocalDateTime.of(this, time.toLocalTime()), time.getOffset());
}
/**
* 结合午夜时间0点返回一个LocalDateTime对象
*/
public LocalDateTime atStartOfDay() {
return LocalDateTime.of(this, LocalTime.MIDNIGHT);
}
/**
* 传入时区id，返回一个ZonedDateTime
*/
public ZonedDateTime atStartOfDay(ZoneId zone) {
Objects.requireNonNull(zone, "zone");
// need to handle case where there is a gap from 11:30 to 00:30
// standard ZDT factory would result in 01:00 rather than 00:30
LocalDateTime ldt = atTime(LocalTime.MIDNIGHT);
if (zone instanceof ZoneOffset == false) {
ZoneRules rules = zone.getRules();
ZoneOffsetTransition trans = rules.getTransition(ldt);
if (trans != null && trans.isGap()) {
ldt = trans.getDateTimeAfter();
}
}
return ZonedDateTime.of(ldt, zone);
}
//-----------------------------------------------------------------------
@Override
public long toEpochDay() {
long y = year;
long m = month;
long total = 0;
total += 365 * y;
if (y >= 0) {
total += (y + 3) / 4 - (y + 99) / 100 + (y + 399) / 400;
} else {
total -= y / -4 - y / -100 + y / -400;
}
total += ((367 * m - 362) / 12);
total += day - 1;
if (m > 2) {
total--;
if (isLeapYear() == false) {
total--;
}
}
return total - DAYS_0000_TO_1970;
}
//-----------------------------------------------------------------------
/**
* 和另一个日期的年月日进行比较判断
*/
@Override // override for Javadoc and performance
public int compareTo(ChronoLocalDate other) {
if (other instanceof LocalDate) {
return compareTo0((LocalDate) other);
}
return ChronoLocalDate.super.compareTo(other);
}
int compareTo0(LocalDate otherDate) {
int cmp = (year - otherDate.year);
if (cmp == 0) {
cmp = (month - otherDate.month);
if (cmp == 0) {
cmp = (day - otherDate.day);
}
}
return cmp;
}
/**
* 判断一个日期是否在另一个之后
*/
@Override // override for Javadoc and performance
public boolean isAfter(ChronoLocalDate other) {
if (other instanceof LocalDate) {
return compareTo0((LocalDate) other) > 0;
}
return ChronoLocalDate.super.isAfter(other);
}
/**
* 判断一个日期是否在另一个日期之前
*/
@Override // override for Javadoc and performance
public boolean isBefore(ChronoLocalDate other) {
if (other instanceof LocalDate) {
return compareTo0((LocalDate) other) < 0;
}
return ChronoLocalDate.super.isBefore(other);
}
/**
* 判断一个日期是否在另一个之前
*/
@Override // override for Javadoc and performance
public boolean isEqual(ChronoLocalDate other) {
if (other instanceof LocalDate) {
return compareTo0((LocalDate) other) == 0;
}
return ChronoLocalDate.super.isEqual(other);
}
//-----------------------------------------------------------------------
/**
* 重写object的equals方法，判断与对象obj是否相等
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj instanceof LocalDate) {
return compareTo0((LocalDate) obj) == 0;
}
return false;
}
/**
* 重写object的hashcode方法
*/
@Override
public int hashCode() {
int yearValue = year;
int monthValue = month;
int dayValue = day;
return (yearValue & 0xFFFFF800) ^ ((yearValue << 11) + (monthValue << 6) + (dayValue));
}
//-----------------------------------------------------------------------
/**
*重写toString方法，返回格式： {@code 2007-12-03}.
*
*/
@Override
public String toString() {
int yearValue = year;
int monthValue = month;
int dayValue = day;
int absYear = Math.abs(yearValue);
StringBuilder buf = new StringBuilder(10);
if (absYear < 1000) {
if (yearValue < 0) {
buf.append(yearValue - 10000).deleteCharAt(1);
} else {
buf.append(yearValue + 10000).deleteCharAt(0);
}
} else {
if (yearValue > 9999) {
buf.append('+');
}
buf.append(yearValue);
}
return buf.append(monthValue < 10 ? "-0" : "-")
.append(monthValue)
.append(dayValue < 10 ? "-0" : "-")
.append(dayValue)
.toString();
}
//-----------------------------------------------------------------------
/**
* Writes the object using a
* <a href="../../serialized-form.html#java.time.Ser">dedicated serialized form</a>.
* @serialData
* <pre>
* out.writeByte(3); // identifies a LocalDate
* out.writeInt(year);
* out.writeByte(month);
* out.writeByte(day);
* </pre>
*
* @return the instance of {@code Ser}, not null
*/
private Object writeReplace() {
return new Ser(Ser.LOCAL_DATE_TYPE, this);
}
/**
* Defend against malicious streams.
*
* @param s the stream to read
* @throws InvalidObjectException always
*/
private void readObject(ObjectInputStream s) throws InvalidObjectException {
throw new InvalidObjectException("Deserialization via serialization delegate");
}
void writeExternal(DataOutput out) throws IOException {
out.writeInt(year);
out.writeByte(month);
out.writeByte(day);
}
static LocalDate readExternal(DataInput in) throws IOException {
int year = in.readInt();
int month = in.readByte();
int dayOfMonth = in.readByte();
return LocalDate.of(year, month, dayOfMonth);
}
}LocalDate源码分析
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