wheredate-carbon-timezone-convert-from-until.php

    $strLocalTimezone = 'Asia/Makassar';
    $carbonNow = Carbon::now($strLocalTimezone);

    $strFrom = $carbonNow->format('Y-m-d 00:00:00');
    $strUntil = $carbonNow->format('Y-m-d 23:59:59');

    $carbonFrom = Carbon::parse($strFrom, $strLocalTimezone);
    $carbonUntil = Carbon::parse($strUntil, $strLocalTimezone);

    echo $strLocalTimezone;
    echo "\n<br>\n";
    echo ' -----> ';
    echo 'From=';
    echo ((string) $carbonFrom);
    echo ' ';
    echo 'Until=';
    echo ((string) $carbonUntil);
    echo "\n<br>\n";

    $carbonFrom->tz = 'UTC';
    $carbonUntil->tz = 'UTC';

    echo 'UTC';
    echo "\n<br>\n";
    echo ' -----> ';
    echo 'From=';
    echo ((string) $carbonFrom);
    echo ' ';
    echo 'Until=';
    echo ((string) $carbonUntil);
    echo "\n<br>\n";

    exit();