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LocalDate.php
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LocalDate.php
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<?php
declare(strict_types=1);
namespace Brick\DateTime;
use Brick\DateTime\Parser\DateTimeParseException;
use Brick\DateTime\Parser\DateTimeParser;
use Brick\DateTime\Parser\DateTimeParseResult;
use Brick\DateTime\Parser\IsoParsers;
use Brick\DateTime\Utility\Math;
use DateTime;
use DateTimeImmutable;
use DateTimeInterface;
use JsonSerializable;
use Stringable;
use function intdiv;
use function min;
use function str_pad;
use const STR_PAD_LEFT;
/**
* A date without a time-zone in the ISO-8601 calendar system, such as `2007-12-03`.
*
* This class is immutable.
*/
final class LocalDate implements JsonSerializable, Stringable
{
/**
* The minimum supported year for instances of `LocalDate`, -999,999.
*/
public const MIN_YEAR = -999_999;
/**
* The maximum supported year for instances of `LocalDate`, 999,999.
*/
public const MAX_YEAR = 999_999;
/**
* The number of days from year zero to year 1970.
*/
public const DAYS_0000_TO_1970 = 719528;
/**
* The number of days in a 400 year cycle.
*/
public const DAYS_PER_CYCLE = 146097;
/**
* The year.
*/
private readonly int $year;
/**
* The month-of-year.
*/
private readonly int $month;
/**
* The day-of-month.
*/
private readonly int $day;
/**
* Private constructor. Use of() to obtain an instance.
*
* @param int $year The year, validated from MIN_YEAR to MAX_YEAR.
* @param int $month The month-of-year, validated from 1 to 12.
* @param int $day The day-of-month, validated from 1 to 31, valid for the year-month.
*/
private function __construct(int $year, int $month, int $day)
{
$this->year = $year;
$this->month = $month;
$this->day = $day;
}
/**
* Obtains an instance of `LocalDate` from a year, month and day.
*
* @param int $year The year, from MIN_YEAR to MAX_YEAR.
* @param int $month The month-of-year, from 1 (January) to 12 (December).
* @param int $day The day-of-month, from 1 to 31.
*
* @throws DateTimeException If the date is not valid.
*/
public static function of(int $year, int $month, int $day): LocalDate
{
Field\Year::check($year);
Field\MonthOfYear::check($month);
Field\DayOfMonth::check($day, $month, $year);
return new LocalDate($year, $month, $day);
}
/**
* Obtains an instance of `LocalDate` from a year and day-of-year.
*
* @param int $year The year, from MIN_YEAR to MAX_YEAR.
* @param int $dayOfYear The day-of-year, from 1 to 366.
*
* @throws DateTimeException If either value is not valid.
*/
public static function ofYearDay(int $year, int $dayOfYear): LocalDate
{
Field\Year::check($year);
Field\DayOfYear::check($dayOfYear, $year);
$isLeap = Field\Year::isLeap($year);
$monthOfYear = Month::from(intdiv($dayOfYear - 1, 31) + 1);
$monthEnd = $monthOfYear->getFirstDayOfYear($isLeap) + $monthOfYear->getLength($isLeap) - 1;
if ($dayOfYear > $monthEnd) {
$monthOfYear = $monthOfYear->plus(1);
}
$dayOfMonth = $dayOfYear - $monthOfYear->getFirstDayOfYear($isLeap) + 1;
return LocalDate::of($year, $monthOfYear->value, $dayOfMonth);
}
/**
* @throws DateTimeException If the date is not valid.
* @throws DateTimeParseException If required fields are missing from the result.
*/
public static function from(DateTimeParseResult $result): LocalDate
{
$year = (int) $result->getField(Field\Year::NAME);
$month = (int) $result->getField(Field\MonthOfYear::NAME);
$day = (int) $result->getField(Field\DayOfMonth::NAME);
return LocalDate::of($year, $month, $day);
}
/**
* Obtains an instance of `LocalDate` from a text string.
*
* @param string $text The text to parse, such as `2007-12-03`.
* @param DateTimeParser|null $parser The parser to use, defaults to the ISO 8601 parser.
*
* @throws DateTimeException If the date is not valid.
* @throws DateTimeParseException If the text string does not follow the expected format.
*/
public static function parse(string $text, ?DateTimeParser $parser = null): LocalDate
{
if (! $parser) {
$parser = IsoParsers::localDate();
}
return LocalDate::from($parser->parse($text));
}
/**
* Creates a LocalDate from a native DateTime or DateTimeImmutable object.
*/
public static function fromNativeDateTime(DateTimeInterface $dateTime): LocalDate
{
return new LocalDate(
(int) $dateTime->format('Y'),
(int) $dateTime->format('n'),
(int) $dateTime->format('j')
);
}
/**
* Obtains an instance of `LocalDate` from the epoch day count.
*
* The Epoch Day count is a simple incrementing count of days
* where day 0 is 1970-01-01. Negative numbers represent earlier days.
*
* @throws DateTimeException If the resulting date has a year out of range.
*/
public static function ofEpochDay(int $epochDay): LocalDate
{
$zeroDay = $epochDay + self::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.
$adjust = 0;
if ($zeroDay < 0) {
// Adjust negative years to positive for calculation.
$adjustCycles = intdiv(($zeroDay + 1), self::DAYS_PER_CYCLE) - 1;
$adjust = $adjustCycles * 400;
$zeroDay += -$adjustCycles * self::DAYS_PER_CYCLE;
}
$yearEst = intdiv(400 * $zeroDay + 591, self::DAYS_PER_CYCLE);
$doyEst = $zeroDay - (365 * $yearEst + intdiv($yearEst, 4) - intdiv($yearEst, 100) + intdiv($yearEst, 400));
if ($doyEst < 0) {
// Fix estimate.
$yearEst--;
$doyEst = $zeroDay - (365 * $yearEst + intdiv($yearEst, 4) - intdiv($yearEst, 100) + intdiv($yearEst, 400));
}
$yearEst += $adjust; // Reset any negative year.
$marchDoy0 = $doyEst;
// Convert march-based values back to January-based.
$marchMonth0 = intdiv($marchDoy0 * 5 + 2, 153);
$month = ($marchMonth0 + 2) % 12 + 1;
$dom = $marchDoy0 - intdiv($marchMonth0 * 306 + 5, 10) + 1;
$yearEst += intdiv($marchMonth0, 10);
// Check year now we are certain it is correct.
Field\Year::check($yearEst);
return new LocalDate($yearEst, $month, $dom);
}
/**
* Returns the current date in the given time-zone, according to the given clock.
*
* If no clock is provided, the system clock is used.
*/
public static function now(TimeZone $timeZone, ?Clock $clock = null): LocalDate
{
return ZonedDateTime::now($timeZone, $clock)->getDate();
}
/**
* Returns the minimum supported LocalDate.
*
* This can be used by an application as a "far past" date.
*/
public static function min(): LocalDate
{
/** @var LocalDate|null $min */
static $min;
if ($min) {
return $min;
}
return $min = LocalDate::of(self::MIN_YEAR, 1, 1);
}
/**
* Returns the maximum supported LocalDate.
*
* This can be used by an application as a "far future" date.
*/
public static function max(): LocalDate
{
/** @var LocalDate|null $max */
static $max;
if ($max) {
return $max;
}
return $max = LocalDate::of(self::MAX_YEAR, 12, 31);
}
/**
* Returns the smallest LocalDate among the given values.
*
* @param LocalDate[] $dates The LocalDate objects to compare.
*
* @return LocalDate The earliest LocalDate object.
*
* @throws DateTimeException If the array is empty.
*/
public static function minOf(LocalDate ...$dates): LocalDate
{
if (! $dates) {
throw new DateTimeException(__METHOD__ . ' does not accept less than 1 parameter.');
}
$min = null;
foreach ($dates as $date) {
if ($min === null || $date->isBefore($min)) {
$min = $date;
}
}
return $min;
}
/**
* Returns the highest LocalDate among the given values.
*
* @param LocalDate[] $dates The LocalDate objects to compare.
*
* @return LocalDate The latest LocalDate object.
*
* @throws DateTimeException If the array is empty.
*/
public static function maxOf(LocalDate ...$dates): LocalDate
{
if (! $dates) {
throw new DateTimeException(__METHOD__ . ' does not accept less than 1 parameter.');
}
$max = null;
foreach ($dates as $date) {
if ($max === null || $date->isAfter($max)) {
$max = $date;
}
}
return $max;
}
public function getYear(): int
{
return $this->year;
}
/**
* @deprecated Use getMonthValue() instead.
* In a future version, getMonth() will return the Month enum.
*/
public function getMonth(): int
{
return $this->month;
}
/**
* Returns the month-of-year value from 1 to 12.
*/
public function getMonthValue(): int
{
return $this->month;
}
/**
* @deprecated Use getDayOfMonth() instead.
*/
public function getDay(): int
{
return $this->day;
}
public function getDayOfMonth(): int
{
return $this->day;
}
public function getYearMonth(): YearMonth
{
return YearMonth::of($this->year, $this->month);
}
public function getDayOfWeek(): DayOfWeek
{
return DayOfWeek::from(Math::floorMod($this->toEpochDay() + 3, 7) + 1);
}
/**
* Returns the day-of-year, from 1 to 365, or 366 in a leap year.
*/
public function getDayOfYear(): int
{
return Month::from($this->month)->getFirstDayOfYear($this->isLeapYear()) + $this->day - 1;
}
public function getYearWeek(): YearWeek
{
$year = $this->year;
$week = intdiv($this->getDayOfYear() - $this->getDayOfWeek()->value + 10, 7);
if ($week === 0) {
$year--;
$week = Field\WeekOfYear::getWeeksInYear($year);
} elseif ($week === 53 && ! Field\WeekOfYear::is53WeekYear($this->year)) {
$year++;
$week = 1;
}
return YearWeek::of($year, $week);
}
/**
* Returns a copy of this LocalDate with the year altered.
*
* If the day-of-month is invalid for the year, it will be changed to the last valid day of the month.
*
* @throws DateTimeException If the year is outside the valid range.
*/
public function withYear(int $year): LocalDate
{
if ($year === $this->year) {
return $this;
}
Field\Year::check($year);
return $this->resolvePreviousValid($year, $this->month, $this->day);
}
/**
* Returns a copy of this LocalDate with the month-of-year altered.
*
* If the day-of-month is invalid for the month and year, it will be changed to the last valid day of the month.
*
* @throws DateTimeException If the month is invalid.
*/
public function withMonth(int $month): LocalDate
{
if ($month === $this->month) {
return $this;
}
Field\MonthOfYear::check($month);
return $this->resolvePreviousValid($this->year, $month, $this->day);
}
/**
* Returns a copy of this LocalDate with the day-of-month altered.
*
* If the resulting date is invalid, an exception is thrown.
*
* @throws DateTimeException If the day is invalid for the current year and month.
*/
public function withDay(int $day): LocalDate
{
if ($day === $this->day) {
return $this;
}
Field\DayOfMonth::check($day, $this->month, $this->year);
return new LocalDate($this->year, $this->month, $day);
}
/**
* Returns a copy of this LocalDate with the specified Period added.
*/
public function plusPeriod(Period $period): LocalDate
{
return $this
->plusYears($period->getYears())
->plusMonths($period->getMonths())
->plusDays($period->getDays());
}
/**
* Returns a copy of this LocalDate with the specified period in years added.
*
* If the day-of-month is invalid for the resulting year and month,
* it will be changed to the last valid day of the month.
*
* @throws DateTimeException If the resulting year is out of range.
*/
public function plusYears(int $years): LocalDate
{
if ($years === 0) {
return $this;
}
return $this->withYear($this->year + $years);
}
/**
* Returns a copy of this LocalDate with the specified period in months added.
*
* If the day-of-month is invalid for the resulting year and month,
* it will be changed to the last valid day of the month.
*/
public function plusMonths(int $months): LocalDate
{
$month = $this->month + $months - 1;
$yearDiff = Math::floorDiv($month, 12);
$month = Math::floorMod($month, 12) + 1;
$year = $this->year + $yearDiff;
return $this->resolvePreviousValid($year, $month, $this->day);
}
/**
* Returns a copy of this LocalDate with the specified period in weeks added.
*/
public function plusWeeks(int $weeks): LocalDate
{
if ($weeks === 0) {
return $this;
}
return $this->plusDays($weeks * 7);
}
/**
* Returns a copy of this LocalDate with the specified period in days added.
*/
public function plusDays(int $days): LocalDate
{
if ($days === 0) {
return $this;
}
// Performance optimization for a common use case.
if ($days === 1) {
return $this->day >= 28 && $this->day === $this->getLengthOfMonth()
? new self($this->year + intdiv($this->month, 12), ($this->month % 12) + 1, 1)
: new self($this->year, $this->month, $this->day + 1);
}
return LocalDate::ofEpochDay($this->toEpochDay() + $days);
}
/**
* Returns a copy of this LocalDate with the specified period in weekdays (Monday-Friday) added.
* If the current date is on a weekend and the number of days is zero, the result is the current date.
* This is a slightly different behaviour from PHP DateTime's "+ n weekdays", that would return the next monday.
*
* Note: this is currently a naive implementation that could be greatly improved.
*/
public function plusWeekdays(int $days): LocalDate
{
$result = $this;
if ($days < 0) {
$subtractedDays = 0;
while ($subtractedDays < -$days) {
$result = $result->minusDays(1);
if ($result->getDayOfWeek()->isWeekday()) {
$subtractedDays++;
}
}
} else {
$addedDays = 0;
while ($addedDays < $days) {
$result = $result->plusDays(1);
if ($result->getDayOfWeek()->isWeekday()) {
$addedDays++;
}
}
}
return $result;
}
/**
* Returns a copy of this LocalDate with the specified period in weekdays (Monday-Friday) subtracted.
* If the current date is on a weekend and the number of days is zero, the result is the current date.
* This is a slightly different behaviour from PHP DateTime's "- n weekdays", that would return the next monday.
*/
public function minusWeekdays(int $days): LocalDate
{
return $this->plusWeekdays(-$days);
}
/**
* Returns a copy of this LocalDate with the specified Period subtracted.
*/
public function minusPeriod(Period $period): LocalDate
{
return $this->plusPeriod($period->negated());
}
/**
* Returns a copy of this LocalDate with the specified period in years subtracted.
*/
public function minusYears(int $years): LocalDate
{
return $this->plusYears(-$years);
}
/**
* Returns a copy of this LocalDate with the specified period in months subtracted.
*/
public function minusMonths(int $months): LocalDate
{
return $this->plusMonths(-$months);
}
/**
* Returns a copy of this LocalDate with the specified period in weeks subtracted.
*/
public function minusWeeks(int $weeks): LocalDate
{
return $this->plusWeeks(-$weeks);
}
/**
* Returns a copy of this LocalDate with the specified period in days subtracted.
*/
public function minusDays(int $days): LocalDate
{
return $this->plusDays(-$days);
}
/**
* Returns -1 if this date is before the given date, 1 if after, 0 if the dates are equal.
*
* @return int [-1,0,1] If this date is before, on, or after the given date.
*/
public function compareTo(LocalDate $that): int
{
if ($this->year < $that->year) {
return -1;
}
if ($this->year > $that->year) {
return 1;
}
if ($this->month < $that->month) {
return -1;
}
if ($this->month > $that->month) {
return 1;
}
if ($this->day < $that->day) {
return -1;
}
if ($this->day > $that->day) {
return 1;
}
return 0;
}
public function isEqualTo(LocalDate $that): bool
{
return $this->compareTo($that) === 0;
}
public function isBefore(LocalDate $that): bool
{
return $this->compareTo($that) === -1;
}
public function isBeforeOrEqualTo(LocalDate $that): bool
{
return $this->compareTo($that) <= 0;
}
public function isAfter(LocalDate $that): bool
{
return $this->compareTo($that) === 1;
}
public function isAfterOrEqualTo(LocalDate $that): bool
{
return $this->compareTo($that) >= 0;
}
/**
* Calculates the period between this date and another date.
*
* This calculates the period between the two dates in terms of years, months and days.
* 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.
*
* 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 `2010-01-15` to `2011-03-18` is 1 year, 2 months and 3 days.
*/
public function until(LocalDate $endDateExclusive): Period
{
$totalMonths = $endDateExclusive->getProlepticMonth() - $this->getProlepticMonth();
$days = $endDateExclusive->day - $this->day;
if ($totalMonths > 0 && $days < 0) {
$totalMonths--;
$calcDate = $this->plusMonths($totalMonths);
$days = $endDateExclusive->toEpochDay() - $calcDate->toEpochDay();
} elseif ($totalMonths < 0 && $days > 0) {
$totalMonths++;
$days -= $endDateExclusive->getLengthOfMonth();
}
$years = intdiv($totalMonths, 12);
$months = $totalMonths % 12;
return Period::of($years, $months, $days);
}
/**
* Calculates the number of days between this date and another date.
*
* The start date is included, but the end date is not.
* For example, `2018-02-15` to `2018-04-01` is 45 days.
*/
public function daysUntil(LocalDate $endDateExclusive): int
{
return $endDateExclusive->toEpochDay() - $this->toEpochDay();
}
/**
* Returns a local date-time formed from this date at the specified time.
*/
public function atTime(LocalTime $time): LocalDateTime
{
return new LocalDateTime($this, $time);
}
/**
* Checks if the year is a leap year, according to the ISO proleptic calendar system rules.
*/
public function isLeapYear(): bool
{
return Field\Year::isLeap($this->year);
}
/**
* Returns the length of the year represented by this date, in days.
*/
public function getLengthOfYear(): int
{
return $this->isLeapYear() ? 366 : 365;
}
/**
* Returns the length of the month represented by this date, in days.
*/
public function getLengthOfMonth(): int
{
return Field\MonthOfYear::getLength($this->month, $this->year);
}
/**
* Returns the number of days since the UNIX epoch of 1st January 1970.
*/
public function toEpochDay(): int
{
$y = $this->year;
$m = $this->month;
$total = 365 * $y;
if ($y >= 0) {
$total += intdiv($y + 3, 4) - intdiv($y + 99, 100) + intdiv($y + 399, 400);
} else {
$total -= intdiv($y, -4) - intdiv($y, -100) + intdiv($y, -400);
}
$total += intdiv(367 * $m - 362, 12);
$total += $this->day - 1;
if ($m > 2) {
$total--;
if (! $this->isLeapYear()) {
$total--;
}
}
return $total - self::DAYS_0000_TO_1970;
}
/**
* Converts this LocalDate to a native DateTime object.
*
* The result is a DateTime with time 00:00 in the UTC time-zone.
*/
public function toNativeDateTime(): DateTime
{
return $this->atTime(LocalTime::midnight())->toNativeDateTime();
}
/**
* Converts this LocalDate to a native DateTimeImmutable object.
*
* The result is a DateTimeImmutable with time 00:00 in the UTC time-zone.
*/
public function toNativeDateTimeImmutable(): DateTimeImmutable
{
return DateTimeImmutable::createFromMutable($this->toNativeDateTime());
}
/**
* Serializes as a string using {@see LocalDate::toISOString()}.
*/
public function jsonSerialize(): string
{
return $this->toISOString();
}
/**
* Returns the ISO 8601 representation of this date.
*/
public function toISOString(): string
{
// This code is optimized for high performance
return ($this->year < 1000 && $this->year > -1000
? (
$this->year < 0
? '-' . str_pad((string) -$this->year, 4, '0', STR_PAD_LEFT)
: str_pad((string) $this->year, 4, '0', STR_PAD_LEFT)
)
: $this->year
)
. '-'
. ($this->month < 10 ? '0' . $this->month : $this->month)
. '-'
. ($this->day < 10 ? '0' . $this->day : $this->day);
}
/**
* {@see LocalDate::toISOString()}.
*/
public function __toString(): string
{
return $this->toISOString();
}
/**
* Resolves the date, resolving days past the end of month.
*
* @param int $year The year to represent, validated from MIN_YEAR to MAX_YEAR.
* @param int $month The month-of-year to represent, validated from 1 to 12.
* @param int $day The day-of-month to represent, validated from 1 to 31.
*/
private function resolvePreviousValid(int $year, int $month, int $day): LocalDate
{
if ($day > 28) {
$day = min($day, YearMonth::of($year, $month)->getLengthOfMonth());
}
return new LocalDate($year, $month, $day);
}
private function getProlepticMonth(): int
{
return $this->year * 12 + $this->month - 1;
}
}