calcHours.js

function calcHours(ranges) {
    const timeRanges = ranges.split(',').map(range => range.trim().split('-'));

    let totalHours = 0;
    timeRanges.forEach(range => {
        const [start, end] = range.map(time => {
            const [hour, minute] = time.split(':').map(Number);
            return new Date(2000, 0, 1, hour, minute);
        });

        let diff = (end - start) / (1000 * 60 * 60);
        if (diff < 0) {
            diff += 24;
        }

        totalHours += diff;
    });

    return totalHours;
}

if (process.argv.length > 2) {
    const input = process.argv[2];
    const hours = calcHours(input);
    console.log(hours);
} else {
    console.log("Please provide the time ranges as arguments, separated by commas.");
}