Run results for: simple js test

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
expanded script	5978571.5 Ops/sec
Luxon script	526876.5 Ops/sec
fns	4255457.0 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/luxon@3.5.0/build/global/luxon.min.js"></script>
<script src='https://cdn.jsdelivr.net/npm/date-fns@4.1.0/cdn.min.js'></script>

Script Preparation code:

function expanded() {
    const now = new Date();

    const year = now.getFullYear();
    const month = String(now.getMonth() + 1).padStart(2, '0'); // Months are zero-based
    const day = String(now.getDate()).padStart(2, '0');

    const hours = String(now.getHours()).padStart(2, '0');
    const minutes = String(now.getMinutes()).padStart(2, '0');
    const seconds = String(now.getSeconds()).padStart(2, '0');
    const milliseconds = String(now.getMilliseconds()).padStart(3, '0');

    return `${year}-${month}-${day}_${hours}${minutes}${seconds}.${milliseconds}`;
}

function luxonDT() {
  const formattedDate = luxon.DateTime.now().toFormat("yyyy-MM-dd_HHmmss.SSS");
  return formattedDate;
}

function padZero(number, length) {
    return number.toString().padStart(length, '0');
}

const MS_PER_SECOND = 1000;
const MS_PER_MINUTE = MS_PER_SECOND * 60;
const MS_PER_HOUR = MS_PER_MINUTE * 60;
const MS_PER_DAY = MS_PER_HOUR * 24;

function formatUnixTimestamp() {
    let timestamp = Date.now();

    let totalDays = Math.floor(timestamp / MS_PER_DAY);
    let remainingMs = timestamp % MS_PER_DAY;

    // Calculate current time components
    const hours = Math.floor(remainingMs / MS_PER_HOUR);
    remainingMs %= MS_PER_HOUR;
    const minutes = Math.floor(remainingMs / MS_PER_MINUTE);
    remainingMs %= MS_PER_MINUTE;
    const seconds = Math.floor(remainingMs / MS_PER_SECOND);
    const milliseconds = remainingMs % MS_PER_SECOND;

    // Calculate current year
    let year = 1970;
    while (true) {
        const daysInYear = (year % 4 === 0 && year % 100 !== 0) || (year % 400 === 0) ? 366 : 365;
        if (totalDays >= daysInYear) {
            totalDays -= daysInYear;
            year++;
        } else {
            break;
        }
    }

    // Days in each month
    const daysInMonth = [31, (year % 4 === 0 && year % 100 !== 0) || (year % 400 === 0) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];

    // Calculate current month
    let month = 0;
    while (totalDays >= daysInMonth[month]) {
        totalDays -= daysInMonth[month];
        month++;
    }
    month++; // Convert month to 1-based index

    // Remaining days are the current day
    const day = totalDays + 1; // Convert day to 1-based index

    // Helper function to pad numbers with leading zeros
    const pad = (num, size) => num.toString().padStart(size, '0');

    // Format the date string
    return `${year}-${pad(month, 2)}-${pad(day, 2)}_${pad(hours, 2)}${pad(minutes, 2)}${pad(seconds, 2)}.${pad(milliseconds, 3)}`;
}

Tests:

expanded script
expanded();
Luxon script
luxonDT();
fns
formatUnixTimestamp();

Run results for: simple js test

expanded script

Luxon script

fns