src/Khayyam/Khayyam.php
public function min(Carbon $dt = null)
    {
        $dt = ($dt === null) ? static::now($this->tz) : $dt;

        return $this->lt($dt) ? $this : $dt;
    }
public function min(Carbon $dt = null)
    {
        $dt = ($dt === null) ? static::now($this->tz) : $dt;

        return $this->lt($dt) ? $this : $dt;
    }
Get the minimum instance between a given instance (default now) and the current instance.

@param Carbon $dt

@return static