JSFiddle - React, Tailwind, and code Playground

by akmiecik

HTML

<input id="lap" type="time" step='1' min="00:00:00" max="20:00:00">

JavaScript

$lap = document.getElementById('lap');
function lap_time_to_millis($lap) {
    $components = explode('.', $lap);
    $time_components = explode(':', $components[0]);
    return intval($components[1])
         + intval($time_components[2]) * 1000
         + intval($time_components[1]) * 60000
         + intval($time_components[0]) * 3600000;
}