function convert to seconds

convertToSeconds.js

const convertToSeconds = (time) => {
    if (!Array.isArray(time.split(':'))) {
        return false;
    }

    let result =
        time.split(':').length > 2 &&
        time.split(':').map((t, i) => {
            t = parseInt(t);

            if (i === 0) {
                return t * 60 * 60;
            }
            if (i === 1) {
                return t * 60;
            }

            return t;
        });

    if (Array.isArray(result)) {
        return result.reduce((acc, val) => acc + val, 0);
    }

    return false;
};

const sec = convertToSeconds('12:0:0');
const mint = sec/60;
const hours = sec/3600;

console.log(`sec: ${sec}`);
console.log(`mint: ${mint}`);
console.log(`hours: ${hours}`);