The JavaScript Temporal API: Modern Date and Time Handling
The Date object has frustrated developers for decades. Temporal fixes its problems. Here is how to use the new API. The JavaScript Date object has been the source of frustration for decades. It has confusing month indexing that starts at zero, mutable instances that cause subtle bugs, no timezone support beyond UTC and local, and a parser that behaves inconsistently across browsers. The Temporal API is the modern replacement, currently making its way through the TC39 standardization process. After experimenting with it extensively, I can say it fixes every major problem with Date while adding capabilities that were previously impossible without a library. Why Date Is Broken The Date object mixes concerns. A single Date instance represents both a point in time and a calendar date, with no way to distinguish between them. Months are zero-indexed, so January is zero and December is eleven. The object is mutable, so calling setMonth on a shared instance silently changes it for every reference. Timezone handling is limited to the local timezone and UTC, with no support for arbitrary timezones. // The classic Date pitfalls const d = new Date(2026, 0, 15); //…