copy this script to hugo content/posts folder and run php rename_files.php and you will get nicely named files with date prefix

rename_files.php

<?php
//copy this script to hugo content/posts folder and run php rename_files.php and you will get nicely named files with date prefix
if (!function_exists('str_ends_with')) {
    function str_ends_with(string $haystack, string $needle): bool
    {
        $needle_len = strlen($needle);
        return ($needle_len === 0 || 0 === substr_compare($haystack, $needle, -$needle_len));
    }
}

$dir = new DirectoryIterator(dirname(__FILE__));
foreach ($dir as $fileinfo) {
    if ($fileinfo->isDot()) {
        continue;
    }
    if (!str_ends_with($fileinfo->getFilename(), '.md')) {
        continue;
    }

    $markdownOfFile = file_get_contents($fileinfo->getFilename());

    preg_match_all('/title:(.*?)$/m', $markdownOfFile, $output_array);
    $title = $output_array[1][0] ?? null;
    $slug = null;
    if ($title) {
        $title = trim($title);
        $title = trim($title,'"');
        $slug = slugify($title);
        $slug = substr($slug, 0, 60);
    }
    preg_match_all('/date:(.*?)$/m', $markdownOfFile, $output_array);
    $date = $output_array[1][0] ?? null;

    if ($date) {
        $date = trim($date);
        $date = substr($date, 0, 10);
    }

    $newFileName = "{$date}_{$slug}.md";
    echo PHP_EOL . $newFileName;
    if ($date && $title) {
        rename($fileinfo->getFilename(), $newFileName);
    }


}

function slugify($text, string $divider = '-')
{
    // remove unwanted characters (my)
    $text = str_replace(['"', '\''], '', $text);


    // replace non letter or digits by divider
    $text = preg_replace('~[^\pL\d]+~u', $divider, $text);

    // transliterate
    $text = iconv('utf-8', 'us-ascii//TRANSLIT', $text);

    // remove unwanted characters
    $text = preg_replace('~[^-\w]+~', '', $text);

    // trim
    $text = trim($text, $divider);

    // remove duplicate divider
    $text = preg_replace('~-+~', $divider, $text);

    // lowercase
    $text = strtolower($text);

    if (empty($text)) {
        return 'n-a';
    }

    return $text;
}