src/Carbon/Traits/Difference.php
public function diffInRealMilliseconds($date = null, $absolute = true)
    {
        return (int) ($this->diffInRealMicroseconds($date, $absolute) / static::MICROSECONDS_PER_MILLISECOND);
    }
public function diffInRealMilliseconds($date = null, $absolute = true)
    {
        return (int) ($this->diffInRealMicroseconds($date, $absolute) / static::MICROSECONDS_PER_MILLISECOND);
    }
public function diffInRealMilliseconds ( $ date = null , $ absolute = true ) { return ( int ) ( $ this -> diffInRealMicroseconds ( $ date , $ absolute ) / static :: MICROSECONDS_PER_MILLISECOND ) ; }
Get the difference in milliseconds using timestamps.

@param Carbon|\DateTimeInterface|string|null $date
@param bool                                  $absolute Get the absolute of the difference

@return int
Get the difference in milliseconds using timestamps .