dayjs
2KB immutable date time library alternative to Moment.js with the same modern API
74.6M weekly downloads · 3.0 KB gzip · Health 79/100
0
Comparison guide
Dayjs vs Moment
Side-by-side NPM package comparison
Quick Verdict
Smallest Bundle
Dayjs
3.0 KB gzipped
Most Popular
Dayjs
74.6M weekly downloads
Best Maintained
Moment
100/100 maintenance score
Highest Quality
Dayjs
50/100 quality score
Overall Pick
Dayjs
Best all-around based on popularity, size, maintenance & quality
moment
Parse, validate, manipulate, and display dates
37.2M weekly downloads · 19.8 KB gzip · Health 85/100
0
Choosing between Dayjs and Moment? Here's a data-driven comparison based on real npm data — downloads, bundle size, health scores, and more — to help you decide which package fits your project best.
Downloads & Popularity
Dayjs leads with 74.6M weekly downloads — roughly 2.0x more. Moment has 37.2M weekly downloads. Higher download counts generally indicate broader community adoption and a larger ecosystem of tutorials, plugins, and support.
Bundle Size
Dayjs has the smallest gzipped bundle at 3.0 KB. Moment comes in at 19.8 KB. A smaller bundle size means faster page loads, which improves user experience and Core Web Vitals scores.
Health Score Comparison
Moment has an overall health score of 85/100 (very good), with strong maintenance, security, popularity scores. Dayjs has an overall health score of 79/100 (very good), with strong maintenance, security, popularity scores. Health scores are calculated from maintenance activity, code quality, security posture, popularity, and stability metrics.
When to Choose Each
Choose Dayjs if you value massive community and ecosystem, minimal bundle footprint, strong security track record. Choose Moment if you value massive community and ecosystem, actively maintained, strong security track record.
Our Verdict
Both Dayjs and Moment are solid choices for JavaScript development. Moment has the edge in overall health score (85/100), while each package brings unique strengths to the table. Evaluate them based on your project's priorities — whether that's community size, bundle efficiency, or maintenance activity — and choose the one that aligns best with your requirements.
Frequently Asked Questions
- Is dayjs better than moment?
- It depends on your needs. Dayjs has a health score of 79/100 while Moment scores 85/100. Dayjs has more recorded weekly downloads (74.6M). Consider your specific requirements — bundle size, community support, and feature set — to decide which is the better fit.
- Which has a smaller bundle size, dayjs or moment?
- Dayjs has the smaller gzipped bundle at 3.0 KB. A smaller bundle means faster load times for your users, which can positively impact SEO and user experience.
- How many developers use dayjs vs moment?
- Dayjs has more recorded weekly downloads (74.6M). Download counts reflect package installations, not unique developers.
- Which is better maintained, dayjs or moment?
- Moment has a maintenance score of 100/100. Dayjs scores 80/100 and Moment scores 100/100 on maintenance.
Related Comparisons
The 2026 JavaScript Stack Cheatsheet
One PDF: the best package for every category (ORMs, bundlers, auth, testing, state management). Used by 500+ devs. Free, updated monthly.