briannesbitt/Carbon · error · UnknownUnitException

$unit

Error message

$unit

What it means

Error "$unit" thrown in briannesbitt/Carbon.

Source

Thrown at src/Carbon/Traits/Difference.php:112

    }

    /**
     * @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);

View on GitHub (pinned to b13f05955d)

When it happens

Trigger: Thrown at src/Carbon/Traits/Difference.php:112 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of briannesbitt/Carbon@b13f05955d (2026-08-17). Data as JSON: /api/errors/e2435c0038cc02d1. Report an issue: GitHub.