2KB immutable date time library alternative to Moment.js with the same modern API
Dayjs is 2KB immutable date time library alternative to Moment.js with the same modern API . Licensed under MIT, it is extremely popular in the JavaScript ecosystem with 41.4M weekly downloads.
Dayjs has an excellent overall health score of 85/100. Its strongest dimension is maintenance (100/100), while quality (50/100) is the area with most room for improvement. This package is well-maintained and actively used.
date-fns v4, the Temporal API, and Day.js compared for date handling in JavaScript 2026. Immutability, timezone support, bundle size, and when to use each.
2026-03-09T00:00:00.000Zdate-fns is 13KB, Day.js is 2KB, Luxon is 23KB. Compare tree-shaking, timezone support, and Temporal API readiness to pick the right date library for 2026.
2026-03-08T00:00:00.000ZDevelopers agonize over React vs Svelte while shipping 2MB bundles. Bundle size directly impacts load time, user retention, and conversion. Here's why it.
2026-03-08T00:00:00.000Z