Moment.js is dead for new projects. The maintainers put it into maintenance mode in 2020, citing a bloated bundle size, no tree shaking support, and mutable objects that cause silent bugs. If your codebase still runs on Moment, you are carrying technical debt with no upstream fixes coming.
The replacement is Temporal, a native JavaScript date and time API that reached TC39 Stage 4 in March 2026 and is already shipping in Chrome 144 and Firefox 139. It fixes every core Moment failure: objects are immutable, months use 1-based indexing so January is 1 not 0, time zone support is built in without a separate library, and because it lives in the browser it adds zero bytes to your bundle. Temporal.Instant tracks time to nanosecond precision. Temporal.PlainDate, Temporal.PlainTime, and Temporal.ZonedDateTime let you model exactly the data you have, nothing more.
The full article is a migration guide with direct Moment-to-Temporal code comparisons, including the specific mutation trap that hits when you call moment.utc() and silently rewrites your original object. A polyfill covers Node.js and older browsers today. Read it for the recipes, not just the verdict.
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