Timezone + Incomplete

if (!function_exists('timezone_diff')) {
    function timezone_diff()
    {
        $countries = Country::all();

        $now_utc = \Carbon\Carbon::now('UTC');
        $yesterday_start = \Carbon\Carbon::create($now_utc->year, $now_utc->month, $now_utc->day, 00, 00, 01)->subDay();
        $yesterday_end = \Carbon\Carbon::create($now_utc->year, $now_utc->month, $now_utc->day, 23, 59, 59)->subDay();
        $utc_midnight = \Carbon\Carbon::create($now_utc->year, $now_utc->month, $now_utc->day, 0, 0, 0);

        $times['$yesterday_start'] = $yesterday_start->format('Y-m-d H:i:s');
        $times['$yesterday_end'] = $yesterday_end->format('Y-m-d H:i:s');
        $times['$utc_midnight'] = $utc_midnight->format('Y-m-d H:i:s');
        $times['$now_utc'] = $now_utc->format('Y-m-d H:i:s');

        foreach ($countries as $country) {
            $country_now = \Carbon\Carbon::createFromFormat('Y-m-d H:i:s', $now_utc, 'UTC');
            $country_now->setTimezone($country->timezone);
            $country_now = $country_now->format('Y-m-d H:i:s');
            $times[$country->name] = $country_now;
        }
        return preview($times);
    }
}