Run results for: MomentJS VS Date VS Date-Fns - getTtlFromKey #2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 Safari/537.36

Browser: Chrome 138

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Date JS

1.5M/s

Date-Fns

875K/s

MomentJS

120K/s

View exact numbers

Test name	Executions per second
✓ Date JS	1,471,246 Ops/sec
Date-Fns	874,984 Ops/sec
MomentJS	119,899 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/moment@2.29.4/moment.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/date-fns/cdn.min.js"></script>

Script Preparation code:

function parseDateAsUtc(dateString) {
  // Check if the string already has a timezone indicator (Z or +/-HH:mm)
  const hasTimezoneIndicator = /[+-]\d{2}:\d{2}$|Z$/i.test(dateString);

  let fullIsoString = dateString;

  if (!hasTimezoneIndicator) {
    // If no timezone, we need to add 'Z' to ensure it's parsed as UTC.
    // We also need to fill in missing time components to make it a valid ISO string.
    // Example: '2025-07-18' -> '2025-07-18T00:00:00Z'
    //          '2025-07-18T18' -> '2025-07-18T18:00:00Z'
    //          '2025-07-18T18:30' -> '2025-07-18T18:30:00Z'
    //          '2025-07-18T18:45:05' -> '2025-07-18T18:45:05Z'

    if (!dateString.includes('T')) { // If only date part, add T00:00:00Z
      fullIsoString += 'T00:00:00Z';
    } else { // Has time part, but might be incomplete
      const [datePart, timePart] = dateString.split('T');
      const parts = timePart.split(':');

      let hours = parts[0] || '00';
      let minutes = parts[1] || '00';
      let seconds = parts[2] || '00';

      fullIsoString = `${datePart}T${hours}:${minutes}:${seconds}Z`;
    }
  }

  // Use the native Date constructor, which is robust at parsing full ISO strings.
  // It will correctly interpret a string ending in 'Z' as UTC.
  return new Date(fullIsoString);
}

Tests:

MomentJS
const cacheDurationMinutes = 60; const defaultTtl = cacheDurationMinutes * 60; const effectiveDate = '2025-07-18T18'; const now = moment.utc(); const keyEffectiveDateStart = moment.utc(effectiveDate); const keyEffectiveDateEnd = keyEffectiveDateStart.clone() .add(cacheDurationMinutes, 'minutes'); const secondsTillKeyEnd = keyEffectiveDateEnd.diff(now, 'seconds'); const result = Math.min(defaultTtl, Math.max(0, secondsTillKeyEnd)) || defaultTtl;
Date JS
const cacheDurationMinutes = 60; const defaultTtl = cacheDurationMinutes * 60; const effectiveDate = '2025-07-18T18'; const now = new Date(); const keyEffectiveDateStart = parseDateAsUtc(effectiveDate); const keyEffectiveDateEnd = new Date(keyEffectiveDateStart.getTime()); keyEffectiveDateEnd.setUTCMinutes(keyEffectiveDateEnd.getUTCMinutes() + cacheDurationMinutes); const secondsTillKeyEnd = (keyEffectiveDateEnd.getTime() - now.getTime()) / 1000; const result = Math.min(defaultTtl, Math.max(0, secondsTillKeyEnd)) || defaultTtl;
Date-Fns
const cacheDurationMinutes = 60; const defaultTtl = cacheDurationMinutes * 60; const effectiveDate = '2025-07-18T18'; const now = new Date(); const keyEffectiveDateStart = parseDateAsUtc(effectiveDate); const keyEffectiveDateEnd = dateFns.addMinutes(keyEffectiveDateStart, cacheDurationMinutes); const secondsTillKeyEnd = dateFns.differenceInSeconds(keyEffectiveDateEnd, now); const result = Math.min(defaultTtl, Math.max(0, secondsTillKeyEnd)) || defaultTtl;