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 42.9M weekly downloads.
Dayjs has an good overall health score of 79/100. Its strongest dimension is popularity (100/100), while quality (50/100) is the area with most room for improvement. This package is in good shape overall.
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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.
2026-03-08T00:00:00.000ZYour bundle size matters more than your framework choice for real-world performance. The data on what actually impacts Core Web Vitals and how to optimize it.
2026-03-08T00:00:00.000Z