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File / Folder	Size	Action
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Boundaries.php	12.146KB	edt ren
Cast.php	1.159KB	edt ren
Comparison.php	46.094KB	edt ren
Converter.php	14.122KB	edt ren
Creator.php	31.392KB	edt ren
Date.php	228.161KB	edt ren
DeprecatedPeriodPropert...	1.89KB	edt ren
Difference.php	42.634KB	edt ren
IntervalRounding.php	1.649KB	edt ren
IntervalStep.php	2.36KB	edt ren
LocalFactory.php	1.588KB	edt ren
Localization.php	25.531KB	edt ren
Macro.php	2.706KB	edt ren
MagicParameter.php	0.729KB	edt ren
Mixin.php	6.183KB	edt ren
Modifiers.php	13.589KB	edt ren
Mutability.php	1.286KB	edt ren
ObjectInitialisation.php	0.438KB	edt ren
Options.php	5.922KB	edt ren
Rounding.php	6.927KB	edt ren
Serialization.php	8.872KB	edt ren
StaticLocalization.php	2.331KB	edt ren
StaticOptions.php	5.276KB	edt ren
Test.php	6.444KB	edt ren
Timestamp.php	6.451KB	edt ren
ToStringFormat.php	1.416KB	edt ren
Units.php	14.312KB	edt ren
Week.php	7.545KB	edt ren

<?php

declare(strict_types=1);

/**
 * This file is part of the Carbon package.
 *
 * (c) Brian Nesbitt <brian@nesbot.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Carbon\Traits;

use Carbon\Carbon;
use Carbon\CarbonImmutable;
use Carbon\CarbonInterface;
use Carbon\CarbonInterval;
use Carbon\CarbonPeriod;
use Carbon\Exceptions\UnknownUnitException;
use Carbon\Unit;
use Closure;
use DateInterval;
use DateTimeInterface;

/**
 * Trait Difference.
 *
 * Depends on the following methods:
 *
 * @method bool lessThan($date)
 * @method static copy()
 * @method static resolveCarbon($date = null)
 */
trait Difference
{
    /**
     * Get the difference as a DateInterval instance.
     * Return relative interval (negative if $absolute flag is not set to true and the given date is before
     * current one).
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return DateInterval
     */
    public function diffAsDateInterval($date = null, bool $absolute = false): DateInterval
    {
        $other = $this->resolveCarbon($date);

// Work-around for https://bugs.php.net/bug.php?id=81458
        // It was initially introduced for https://bugs.php.net/bug.php?id=80998
        // The very specific case of 80998 was fixed in PHP 8.1beta3, but it introduced 81458
        // So we still need to keep this for now
        if ($other->tz !== $this->tz) {
            $other = $other->avoidMutation()->setTimezone($this->tz);
        }

return parent::diff($other, $absolute);
    }

/**
     * Get the difference as a CarbonInterval instance.
     * Return relative interval (negative if $absolute flag is not set to true and the given date is before
     * current one).
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return CarbonInterval
     */
    public function diffAsCarbonInterval($date = null, bool $absolute = false, array $skip = []): CarbonInterval
    {
        return CarbonInterval::diff($this, $this->resolveCarbon($date), $absolute, $skip)
            ->setLocalTranslator($this->getLocalTranslator());
    }

/**
     * @alias diffAsCarbonInterval
     *
     * Get the difference as a DateInterval instance.
     * Return relative interval (negative if $absolute flag is not set to true and the given date is before
     * current one).
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return CarbonInterval
     */
    public function diff($date = null, bool $absolute = false, array $skip = []): CarbonInterval
    {
        return $this->diffAsCarbonInterval($date, $absolute, $skip);
    }

/**
     * @param Unit|string                                            $unit     microsecond, millisecond, second, minute,
     *                                                                         hour, day, week, month, quarter, year,
     *                                                                         century, millennium
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     * @param bool                                                   $utc      Always convert dates to UTC before comparing (if not set, it will do it only if timezones are different)
     *
     * @return float
     */
    public function diffInUnit(Unit|string $unit, $date = null, bool $absolute = false, bool $utc = false): float
    {
        $unit = static::pluralUnit($unit instanceof Unit ? $unit->value : rtrim($unit, 'z'));
        $method = 'diffIn'.$unit;

if (!method_exists($this, $method)) {
            throw new UnknownUnitException($unit);
        }

return $this->$method($date, $absolute, $utc);
    }

/**
     * Get the difference in years
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     * @param bool                                                   $utc      Always convert dates to UTC before comparing (if not set, it will do it only if timezones are different)
     *
     * @return float
     */
    public function diffInYears($date = null, bool $absolute = false, bool $utc = false): float
    {
        $start = $this;
        $end = $this->resolveCarbon($date);

if ($utc) {
            $start = $start->avoidMutation()->utc();
            $end = $end->avoidMutation()->utc();
        }

$ascending = ($start <= $end);
        $sign = $absolute || $ascending ? 1 : -1;

if (!$ascending) {
            [$start, $end] = [$end, $start];
        }

$yearsDiff = (int) $start->diff($end, $absolute)->format('%r%y');
        /** @var Carbon|CarbonImmutable $floorEnd */
        $floorEnd = $start->avoidMutation()->addYears($yearsDiff);

if ($floorEnd >= $end) {
            return $sign * $yearsDiff;
        }

/** @var Carbon|CarbonImmutable $ceilEnd */
        $ceilEnd = $start->avoidMutation()->addYears($yearsDiff + 1);

$daysToFloor = $floorEnd->diffInDays($end);
        $daysToCeil = $end->diffInDays($ceilEnd);

return $sign * ($yearsDiff + $daysToFloor / ($daysToCeil + $daysToFloor));
    }

/**
     * Get the difference in quarters.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     * @param bool                                                   $utc      Always convert dates to UTC before comparing (if not set, it will do it only if timezones are different)
     *
     * @return float
     */
    public function diffInQuarters($date = null, bool $absolute = false, bool $utc = false): float
    {
        return $this->diffInMonths($date, $absolute, $utc) / static::MONTHS_PER_QUARTER;
    }

/**
     * Get the difference in months.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     * @param bool                                                   $utc      Always convert dates to UTC before comparing (if not set, it will do it only if timezones are different)
     *
     * @return float
     */
    public function diffInMonths($date = null, bool $absolute = false, bool $utc = false): float
    {
        $start = $this;
        $end = $this->resolveCarbon($date);

// Compare using UTC
        if ($utc || ($end->timezoneName !== $start->timezoneName)) {
            $start = $start->avoidMutation()->utc();
            $end = $end->avoidMutation()->utc();
        }

[$yearStart, $monthStart, $dayStart] = explode('-', $start->format('Y-m-dHisu'));
        [$yearEnd, $monthEnd, $dayEnd] = explode('-', $end->format('Y-m-dHisu'));

$monthsDiff = (((int) $yearEnd) - ((int) $yearStart)) * static::MONTHS_PER_YEAR +
            ((int) $monthEnd) - ((int) $monthStart);

if ($monthsDiff > 0) {
            $monthsDiff -= ($dayStart > $dayEnd ? 1 : 0);
        } elseif ($monthsDiff < 0) {
            $monthsDiff += ($dayStart < $dayEnd ? 1 : 0);
        }

$ascending = ($start <= $end);
        $sign = $absolute || $ascending ? 1 : -1;
        $monthsDiff = abs($monthsDiff);

if (!$ascending) {
            [$start, $end] = [$end, $start];
        }

/** @var Carbon|CarbonImmutable $floorEnd */
        $floorEnd = $start->avoidMutation()->addMonths($monthsDiff);

if ($floorEnd >= $end) {
            return $sign * $monthsDiff;
        }

/** @var Carbon|CarbonImmutable $ceilEnd */
        $ceilEnd = $start->avoidMutation()->addMonths($monthsDiff + 1);

$daysToFloor = $floorEnd->diffInDays($end);
        $daysToCeil = $end->diffInDays($ceilEnd);

return $sign * ($monthsDiff + $daysToFloor / ($daysToCeil + $daysToFloor));
    }

/**
     * Get the difference in weeks.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     * @param bool                                                   $utc      Always convert dates to UTC before comparing (if not set, it will do it only if timezones are different)
     *
     * @return float
     */
    public function diffInWeeks($date = null, bool $absolute = false, bool $utc = false): float
    {
        return $this->diffInDays($date, $absolute, $utc) / static::DAYS_PER_WEEK;
    }

/**
     * Get the difference in days.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     * @param bool                                                   $utc      Always convert dates to UTC before comparing (if not set, it will do it only if timezones are different)
     *
     * @return float
     */
    public function diffInDays($date = null, bool $absolute = false, bool $utc = false): float
    {
        $date = $this->resolveCarbon($date);
        $current = $this;

// Compare using UTC
        if ($utc || ($date->timezoneName !== $current->timezoneName)) {
            $date = $date->avoidMutation()->utc();
            $current = $current->avoidMutation()->utc();
        }

$negative = ($date < $current);
        [$start, $end] = $negative ? [$date, $current] : [$current, $date];
        $interval = $start->diffAsDateInterval($end);
        $daysA = $this->getIntervalDayDiff($interval);
        $floorEnd = $start->avoidMutation()->addDays($daysA);
        $daysB = $daysA + ($floorEnd <= $end ? 1 : -1);
        $ceilEnd = $start->avoidMutation()->addDays($daysB);
        $microsecondsBetween = $floorEnd->diffInMicroseconds($ceilEnd);
        $microsecondsToEnd = $floorEnd->diffInMicroseconds($end);

return ($negative && !$absolute ? -1 : 1)
            * ($daysA * ($microsecondsBetween - $microsecondsToEnd) + $daysB * $microsecondsToEnd)
            / $microsecondsBetween;
    }

/**
     * Get the difference in days using a filter closure.
     *
     * @param Closure                                                $callback
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return int
     */
    public function diffInDaysFiltered(Closure $callback, $date = null, bool $absolute = false): int
    {
        return $this->diffFiltered(CarbonInterval::day(), $callback, $date, $absolute);
    }

/**
     * Get the difference in hours using a filter closure.
     *
     * @param Closure                                                $callback
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return int
     */
    public function diffInHoursFiltered(Closure $callback, $date = null, bool $absolute = false): int
    {
        return $this->diffFiltered(CarbonInterval::hour(), $callback, $date, $absolute);
    }

/**
     * Get the difference by the given interval using a filter closure.
     *
     * @param CarbonInterval                                         $ci       An interval to traverse by
     * @param Closure                                                $callback
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return int
     */
    public function diffFiltered(CarbonInterval $ci, Closure $callback, $date = null, bool $absolute = false): int
    {
        $start = $this;
        $end = $this->resolveCarbon($date);
        $inverse = false;

if ($end < $start) {
            $start = $end;
            $end = $this;
            $inverse = true;
        }

$options = CarbonPeriod::EXCLUDE_END_DATE | ($this->isMutable() ? 0 : CarbonPeriod::IMMUTABLE);
        $diff = $ci->toPeriod($start, $end, $options)->filter($callback)->count();

return $inverse && !$absolute ? -$diff : $diff;
    }

/**
     * Get the difference in weekdays.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return int
     */
    public function diffInWeekdays($date = null, bool $absolute = false): int
    {
        return $this->diffInDaysFiltered(
            static fn (CarbonInterface $date) => $date->isWeekday(),
            $this->resolveCarbon($date)->avoidMutation()->modify($this->format('H:i:s.u')),
            $absolute,
        );
    }

/**
     * Get the difference in weekend days using a filter.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return int
     */
    public function diffInWeekendDays($date = null, bool $absolute = false): int
    {
        return $this->diffInDaysFiltered(
            static fn (CarbonInterface $date) => $date->isWeekend(),
            $this->resolveCarbon($date)->avoidMutation()->modify($this->format('H:i:s.u')),
            $absolute,
        );
    }

/**
     * Get the difference in hours.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return float
     */
    public function diffInHours($date = null, bool $absolute = false): float
    {
        return $this->diffInMinutes($date, $absolute) / static::MINUTES_PER_HOUR;
    }

/**
     * Get the difference in minutes.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return float
     */
    public function diffInMinutes($date = null, bool $absolute = false): float
    {
        return $this->diffInSeconds($date, $absolute) / static::SECONDS_PER_MINUTE;
    }

/**
     * Get the difference in seconds.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return float
     */
    public function diffInSeconds($date = null, bool $absolute = false): float
    {
        return $this->diffInMilliseconds($date, $absolute) / static::MILLISECONDS_PER_SECOND;
    }

/**
     * Get the difference in microseconds.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return float
     */
    public function diffInMicroseconds($date = null, bool $absolute = false): float
    {
        /** @var CarbonInterface $date */
        $date = $this->resolveCarbon($date);
        $value = ($date->timestamp - $this->timestamp) * static::MICROSECONDS_PER_SECOND +
            $date->micro - $this->micro;

return $absolute ? abs($value) : $value;
    }

/**
     * Get the difference in milliseconds.
     *
     * @param \Carbon\CarbonInterface|\DateTimeInterface|string|null $date
     * @param bool                                                   $absolute Get the absolute of the difference
     *
     * @return float
     */
    public function diffInMilliseconds($date = null, bool $absolute = false): float
    {
        return $this->diffInMicroseconds($date, $absolute) / static::MICROSECONDS_PER_MILLISECOND;
    }

/**
     * The number of seconds since midnight.
     *
     * @return float
     */
    public function secondsSinceMidnight(): float
    {
        return $this->diffInSeconds($this->copy()->startOfDay(), true);
    }

/**
     * The number of seconds until 23:59:59.
     *
     * @return float
     */
    public function secondsUntilEndOfDay(): float
    {
        return $this->diffInSeconds($this->copy()->endOfDay(), true);
    }

/**
     * Get the difference in a human readable format in the current locale from current instance to an other
     * instance given (or now if null given).
     *
     * @example
     * ```
     * echo Carbon::tomorrow()->diffForHumans() . "\n";
     * echo Carbon::tomorrow()->diffForHumans(['parts' => 2]) . "\n";
     * echo Carbon::tomorrow()->diffForHumans(['parts' => 3, 'join' => true]) . "\n";
     * echo Carbon::tomorrow()->diffForHumans(Carbon::yesterday()) . "\n";
     * echo Carbon::tomorrow()->diffForHumans(Carbon::yesterday(), ['short' => true]) . "\n";
     * ```
     *
     * @param Carbon|DateTimeInterface|string|array|null $other   if array passed, will be used as parameters array, see $syntax below;
     *                                                            if null passed, now will be used as comparison reference;
     *                                                            if any other type, it will be converted to date and used as reference.
     * @param int|array                                  $syntax  if array passed, parameters will be extracted from it, the array may contains:
     *                                                            ⦿ 'syntax' entry (see below)
     *                                                            ⦿ 'short' entry (see below)
     *                                                            ⦿ 'parts' entry (see below)
     *                                                            ⦿ 'options' entry (see below)
     *                                                            ⦿ 'skip' entry, list of units to skip (array of strings or a single string,
     *                                                            ` it can be the unit name (singular or plural) or its shortcut
     *                                                            ` (y, m, w, d, h, min, s, ms, µs).
     *                                                            ⦿ 'aUnit' entry, prefer "an hour" over "1 hour" if true
     *                                                            ⦿ 'altNumbers' entry, use alternative numbers if available
     *                                                            ` (from the current language if true is passed, from the given language(s)
     *                                                            ` if array or string is passed)
     *                                                            ⦿ 'join' entry determines how to join multiple parts of the string
     *                                                            `  - if $join is a string, it's used as a joiner glue
     *                                                            `  - if $join is a callable/closure, it get the list of string and should return a string
     *                                                            `  - if $join is an array, the first item will be the default glue, and the second item
     *                                                            `    will be used instead of the glue for the last item
     *                                                            `  - if $join is true, it will be guessed from the locale ('list' translation file entry)
     *                                                            `  - if $join is missing, a space will be used as glue
     *                                                            ⦿ 'other' entry (see above)
     *                                                            ⦿ 'minimumUnit' entry determines the smallest unit of time to display can be long or
     *                                                            `  short form of the units, e.g. 'hour' or 'h' (default value: s)
     *                                                            ⦿ 'locale' language in which the diff should be output (has no effect if 'translator' key is set)
     *                                                            ⦿ 'translator' a custom translator to use to translator the output.
     *                                                            if int passed, it adds modifiers:
     *                                                            Possible values:
     *                                                            - CarbonInterface::DIFF_ABSOLUTE          no modifiers
     *                                                            - CarbonInterface::DIFF_RELATIVE_TO_NOW   add ago/from now modifier
     *                                                            - CarbonInterface::DIFF_RELATIVE_TO_OTHER add before/after modifier
     *                                                            Default value: CarbonInterface::DIFF_ABSOLUTE
     * @param bool                                       $short   displays short format of time units
     * @param int                                        $parts   maximum number of parts to display (default value: 1: single unit)
     * @param int                                        $options human diff options
     */
    public function diffForHumans($other = null, $syntax = null, $short = false, $parts = 1, $options = null): string
    {
        /* @var CarbonInterface $this */
        if (\is_array($other)) {
            $other['syntax'] = \array_key_exists('syntax', $other) ? $other['syntax'] : $syntax;
            $syntax = $other;
            $other = $syntax['other'] ?? null;
        }

$intSyntax = &$syntax;

if (\is_array($syntax)) {
            $syntax['syntax'] = $syntax['syntax'] ?? null;
            $intSyntax = &$syntax['syntax'];
        }

$intSyntax = (int) ($intSyntax ?? static::DIFF_RELATIVE_AUTO);
        $intSyntax = $intSyntax === static::DIFF_RELATIVE_AUTO && $other === null ? static::DIFF_RELATIVE_TO_NOW : $intSyntax;

$parts = min(7, max(1, (int) $parts));
        $skip = \is_array($syntax) ? ($syntax['skip'] ?? []) : [];
        $options ??= $this->localHumanDiffOptions ?? $this->transmitFactory(
            static fn () => static::getHumanDiffOptions(),
        );

return $this->diff($other, skip: (array) $skip)->forHumans($syntax, (bool) $short, $parts, $options);
    }

/**
     * @alias diffForHumans
     *
     * Get the difference in a human readable format in the current locale from current instance to an other
     * instance given (or now if null given).
     *
     * @param Carbon|\DateTimeInterface|string|array|null $other   if array passed, will be used as parameters array, see $syntax below;
     *                                                             if null passed, now will be used as comparison reference;
     *                                                             if any other type, it will be converted to date and used as reference.
     * @param int|array                                   $syntax  if array passed, parameters will be extracted from it, the array may contains:
     *                                                             - 'syntax' entry (see below)
     *                                                             - 'short' entry (see below)
     *                                                             - 'parts' entry (see below)
     *                                                             - 'options' entry (see below)
     *                                                             - 'join' entry determines how to join multiple parts of the string
     *                                                             `  - if $join is a string, it's used as a joiner glue
     *                                                             `  - if $join is a callable/closure, it get the list of string and should return a string
     *                                                             `  - if $join is an array, the first item will be the default glue, and the second item
     *                                                             `    will be used instead of the glue for the last item
     *                                                             `  - if $join is true, it will be guessed from the locale ('list' translation file entry)
     *                                                             `  - if $join is missing, a space will be used as glue
     *                                                             - 'other' entry (see above)
     *                                                             if int passed, it add modifiers:
     *                                                             Possible values:
     *                                                             - CarbonInterface::DIFF_ABSOLUTE          no modifiers
     *                                                             - CarbonInterface::DIFF_RELATIVE_TO_NOW   add ago/from now modifier
     *                                                             - CarbonInterface::DIFF_RELATIVE_TO_OTHER add before/after modifier
     *                                                             Default value: CarbonInterface::DIFF_ABSOLUTE
     * @param bool                                        $short   displays short format of time units
     * @param int                                         $parts   maximum number of parts to display (default value: 1: single unit)
     * @param int                                         $options human diff options
     *
     * @return string
     */
    public function from($other = null, $syntax = null, $short = false, $parts = 1, $options = null)
    {
        return $this->diffForHumans($other, $syntax, $short, $parts, $options);
    }

/**
     * @alias diffForHumans
     *
     * Get the difference in a human readable format in the current locale from current instance to an other
     * instance given (or now if null given).
     */
    public function since($other = null, $syntax = null, $short = false, $parts = 1, $options = null)
    {
        return $this->diffForHumans($other, $syntax, $short, $parts, $options);
    }

/**
     * Get the difference in a human readable format in the current locale from an other
     * instance given (or now if null given) to current instance.
     *
     * When comparing a value in the past to default now:
     * 1 hour from now
     * 5 months from now
     *
     * When comparing a value in the future to default now:
     * 1 hour ago
     * 5 months ago
     *
     * When comparing a value in the past to another value:
     * 1 hour after
     * 5 months after
     *
     * When comparing a value in the future to another value:
     * 1 hour before
     * 5 months before
     *
     * @param Carbon|\DateTimeInterface|string|array|null $other   if array passed, will be used as parameters array, see $syntax below;
     *                                                             if null passed, now will be used as comparison reference;
     *                                                             if any other type, it will be converted to date and used as reference.
     * @param int|array                                   $syntax  if array passed, parameters will be extracted from it, the array may contains:
     *                                                             - 'syntax' entry (see below)
     *                                                             - 'short' entry (see below)
     *                                                             - 'parts' entry (see below)
     *                                                             - 'options' entry (see below)
     *                                                             - 'join' entry determines how to join multiple parts of the string
     *                                                             `  - if $join is a string, it's used as a joiner glue
     *                                                             `  - if $join is a callable/closure, it get the list of string and should return a string
     *                                                             `  - if $join is an array, the first item will be the default glue, and the second item
     *                                                             `    will be used instead of the glue for the last item
     *                                                             `  - if $join is true, it will be guessed from the locale ('list' translation file entry)
     *                                                             `  - if $join is missing, a space will be used as glue
     *                                                             - 'other' entry (see above)
     *                                                             if int passed, it add modifiers:
     *                                                             Possible values:
     *                                                             - CarbonInterface::DIFF_ABSOLUTE          no modifiers
     *                                                             - CarbonInterface::DIFF_RELATIVE_TO_NOW   add ago/from now modifier
     *                                                             - CarbonInterface::DIFF_RELATIVE_TO_OTHER add before/after modifier
     *                                                             Default value: CarbonInterface::DIFF_ABSOLUTE
     * @param bool                                        $short   displays short format of time units
     * @param int                                         $parts   maximum number of parts to display (default value: 1: single unit)
     * @param int                                         $options human diff options
     *
     * @return string
     */
    public function to($other = null, $syntax = null, $short = false, $parts = 1, $options = null)
    {
        if (!$syntax && !$other) {
            $syntax = CarbonInterface::DIFF_RELATIVE_TO_NOW;
        }

return $this->resolveCarbon($other)->diffForHumans($this, $syntax, $short, $parts, $options);
    }

/**
     * @alias to
     *
     * Get the difference in a human readable format in the current locale from an other
     * instance given (or now if null given) to current instance.
     *
     * @param Carbon|\DateTimeInterface|string|array|null $other   if array passed, will be used as parameters array, see $syntax below;
     *                                                             if null passed, now will be used as comparison reference;
     *                                                             if any other type, it will be converted to date and used as reference.
     * @param int|array                                   $syntax  if array passed, parameters will be extracted from it, the array may contains:
     *                                                             - 'syntax' entry (see below)
     *                                                             - 'short' entry (see below)
     *                                                             - 'parts' entry (see below)
     *                                                             - 'options' entry (see below)
     *                                                             - 'join' entry determines how to join multiple parts of the string
     *                                                             `  - if $join is a string, it's used as a joiner glue
     *                                                             `  - if $join is a callable/closure, it get the list of string and should return a string
     *                                                             `  - if $join is an array, the first item will be the default glue, and the second item
     *                                                             `    will be used instead of the glue for the last item
     *                                                             `  - if $join is true, it will be guessed from the locale ('list' translation file entry)
     *                                                             `  - if $join is missing, a space will be used as glue
     *                                                             - 'other' entry (see above)
     *                                                             if int passed, it add modifiers:
     *                                                             Possible values:
     *                                                             - CarbonInterface::DIFF_ABSOLUTE          no modifiers
     *                                                             - CarbonInterface::DIFF_RELATIVE_TO_NOW   add ago/from now modifier
     *                                                             - CarbonInterface::DIFF_RELATIVE_TO_OTHER add before/after modifier
     *                                                             Default value: CarbonInterface::DIFF_ABSOLUTE
     * @param bool                                        $short   displays short format of time units
     * @param int                                         $parts   maximum number of parts to display (default value: 1: single unit)
     * @param int                                         $options human diff options
     *
     * @return string
     */
    public function until($other = null, $syntax = null, $short = false, $parts = 1, $options = null)
    {
        return $this->to($other, $syntax, $short, $parts, $options);
    }

/**
     * Get the difference in a human readable format in the current locale from current
     * instance to now.
     *
     * @param int|array $syntax  if array passed, parameters will be extracted from it, the array may contains:
     *                           - 'syntax' entry (see below)
     *                           - 'short' entry (see below)
     *                           - 'parts' entry (see below)
     *                           - 'options' entry (see below)
     *                           - 'join' entry determines how to join multiple parts of the string
     *                           `  - if $join is a string, it's used as a joiner glue
     *                           `  - if $join is a callable/closure, it get the list of string and should return a string
     *                           `  - if $join is an array, the first item will be the default glue, and the second item
     *                           `    will be used instead of the glue for the last item
     *                           `  - if $join is true, it will be guessed from the locale ('list' translation file entry)
     *                           `  - if $join is missing, a space will be used as glue
     *                           if int passed, it add modifiers:
     *                           Possible values:
     *                           - CarbonInterface::DIFF_ABSOLUTE          no modifiers
     *                           - CarbonInterface::DIFF_RELATIVE_TO_NOW   add ago/from now modifier
     *                           - CarbonInterface::DIFF_RELATIVE_TO_OTHER add before/after modifier
     *                           Default value: CarbonInterface::DIFF_ABSOLUTE
     * @param bool      $short   displays short format of time units
     * @param int       $parts   maximum number of parts to display (default value: 1: single unit)
     * @param int       $options human diff options
     *
     * @return string
     */
    public function fromNow($syntax = null, $short = false, $parts = 1, $options = null)
    {
        $other = null;

if ($syntax instanceof DateTimeInterface) {
            [$other, $syntax, $short, $parts, $options] = array_pad(\func_get_args(), 5, null);
        }

return $this->from($other, $syntax, $short, $parts, $options);
    }

/**
     * Get the difference in a human readable format in the current locale from an other
     * instance given to now
     *
     * @param int|array $syntax  if array passed, parameters will be extracted from it, the array may contains:
     *                           - 'syntax' entry (see below)
     *                           - 'short' entry (see below)
     *                           - 'parts' entry (see below)
     *                           - 'options' entry (see below)
     *                           - 'join' entry determines how to join multiple parts of the string
     *                           `  - if $join is a string, it's used as a joiner glue
     *                           `  - if $join is a callable/closure, it get the list of string and should return a string
     *                           `  - if $join is an array, the first item will be the default glue, and the second item
     *                           `    will be used instead of the glue for the last item
     *                           `  - if $join is true, it will be guessed from the locale ('list' translation file entry)
     *                           `  - if $join is missing, a space will be used as glue
     *                           if int passed, it add modifiers:
     *                           Possible values:
     *                           - CarbonInterface::DIFF_ABSOLUTE          no modifiers
     *                           - CarbonInterface::DIFF_RELATIVE_TO_NOW   add ago/from now modifier
     *                           - CarbonInterface::DIFF_RELATIVE_TO_OTHER add before/after modifier
     *                           Default value: CarbonInterface::DIFF_ABSOLUTE
     * @param bool      $short   displays short format of time units
     * @param int       $parts   maximum number of parts to display (default value: 1: single part)
     * @param int       $options human diff options
     *
     * @return string
     */
    public function toNow($syntax = null, $short = false, $parts = 1, $options = null)
    {
        return $this->to(null, $syntax, $short, $parts, $options);
    }

/**
     * Get the difference in a human readable format in the current locale from an other
     * instance given to now
     *
     * @param int|array $syntax  if array passed, parameters will be extracted from it, the array may contains:
     *                           - 'syntax' entry (see below)
     *                           - 'short' entry (see below)
     *                           - 'parts' entry (see below)
     *                           - 'options' entry (see below)
     *                           - 'join' entry determines how to join multiple parts of the string
     *                           `  - if $join is a string, it's used as a joiner glue
     *                           `  - if $join is a callable/closure, it get the list of string and should return a string
     *                           `  - if $join is an array, the first item will be the default glue, and the second item
     *                           `    will be used instead of the glue for the last item
     *                           `  - if $join is true, it will be guessed from the locale ('list' translation file entry)
     *                           `  - if $join is missing, a space will be used as glue
     *                           if int passed, it add modifiers:
     *                           Possible values:
     *                           - CarbonInterface::DIFF_ABSOLUTE          no modifiers
     *                           - CarbonInterface::DIFF_RELATIVE_TO_NOW   add ago/from now modifier
     *                           - CarbonInterface::DIFF_RELATIVE_TO_OTHER add before/after modifier
     *                           Default value: CarbonInterface::DIFF_ABSOLUTE
     * @param bool      $short   displays short format of time units
     * @param int       $parts   maximum number of parts to display (default value: 1: single part)
     * @param int       $options human diff options
     *
     * @return string
     */
    public function ago($syntax = null, $short = false, $parts = 1, $options = null)
    {
        $other = null;

if ($syntax instanceof DateTimeInterface) {
            [$other, $syntax, $short, $parts, $options] = array_pad(\func_get_args(), 5, null);
        }

return $this->from($other, $syntax, $short, $parts, $options);
    }

/**
     * Get the difference in a human-readable format in the current locale from current instance to another
     * instance given (or now if null given).
     *
     * @return string
     */
    public function timespan($other = null, $timezone = null): string
    {
        if (\is_string($other)) {
            $other = $this->transmitFactory(static fn () => static::parse($other, $timezone));
        }

return $this->diffForHumans($other, [
            'join' => ', ',
            'syntax' => CarbonInterface::DIFF_ABSOLUTE,
            'parts' => INF,
        ]);
    }

/**
     * Returns either day of week + time (e.g. "Last Friday at 3:30 PM") if reference time is within 7 days,
     * or a calendar date (e.g. "10/29/2017") otherwise.
     *
     * Language, date and time formats will change according to the current locale.
     *
     * @param Carbon|\DateTimeInterface|string|null $referenceTime
     * @param array                                 $formats
     *
     * @return string
     */
    public function calendar($referenceTime = null, array $formats = [])
    {
        /** @var CarbonInterface $current */
        $current = $this->avoidMutation()->startOfDay();
        /** @var CarbonInterface $other */
        $other = $this->resolveCarbon($referenceTime)->avoidMutation()->setTimezone($this->getTimezone())->startOfDay();
        $diff = $other->diffInDays($current, false);
        $format = $diff <= -static::DAYS_PER_WEEK ? 'sameElse' : (
            $diff < -1 ? 'lastWeek' : (
                $diff < 0 ? 'lastDay' : (
                    $diff < 1 ? 'sameDay' : (
                        $diff < 2 ? 'nextDay' : (
                            $diff < static::DAYS_PER_WEEK ? 'nextWeek' : 'sameElse'
                        )
                    )
                )
            )
        );
        $format = array_merge($this->getCalendarFormats(), $formats)[$format];
        if ($format instanceof Closure) {
            $format = $format($current, $other) ?? '';
        }

return $this->isoFormat((string) $format);
    }

private function getIntervalDayDiff(DateInterval $interval): int
    {
        return (int) $interval->format('%r%a');
    }
}