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Date in the browser always represents the local system date stored as milliseconds since January 1st, 1970 in UTC. Time zones are another major frustration. ℹ️ UTC is enough for everyone.right? is an incredible interactive presentation by Zach Holman on how dates work in programming If you need to parse, a date library is a must. While Date has a parse method, MDN documentation for Date‘s dateString notes that usage is “strongly discouraged.” An excellent answer in the Stack Exchange question Why does Date.parse give incorrect results? describes in detail differences in formatting standards and browsers lead to inconsistent and unreliable results. With an immutable date library, adding a week would create a new instance so the original would not change. However it also changes the date in the header! Oops. They use tDate(currentTime.getDate() + 7) at the top to the widget to display next week’s date. Another developer comes in and wants to create a widget that displays next weeks events. Let’s say you create a Date object named currentTime. JavaScript’s Date is mutable, which can lead to unintentional bugs. That Java API is long gone from Java but its problems live on in JavaScript’s Date. ℹ️ Maggie Pint’s blog post Fixing JavaScript Date describes how Javascript’s Date was based on a Java (nope, not a typo) API from the 1990s.
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In addition, JavaScript date libraries offer useful utilities for date manipulation and formatting, which can save developers time and energy. Why not just use JavaScript’s built-in Date object? A good JavaScript date library provides a clear advantage over JavaScript’s Date in several ways: immutability, parsing, and time zones. While Day.js has fewer features than Luxon or date-fns, it’s much smaller in size. Best minimalist option: Day.jsįor basic handling of dates, Day.js is a minimalist library that offers an excellent API without much overhead. Concise, well-written documentation eases the learning curve for getting started. Luxon leverages JavaScript’s Intl for speed and slimness while providing what Intl doesn’t: an immutable user-friendly API. If time zones or localization are your primary concern, we recommend Luxon.
Javascript date code#
A modular architecture allows build tools to trim away unused code for a slimmer final build. Logical and consistent function names encourage readable code. If dates are a critical concern for your JavaScript application, use date-fns. Each feature has clear documentation written in ESM (ES Modules) for the browser. Our picks Best overall: date-fnsĭate-fns offers great documentation, functional architecture, and utilities that handle almost any task you can think of. Our top pick, date-fns, delivers the best feature set combined with an elegant modular architecture. But with so many options how do you pick the best one? In this post we delve into the world of JavaScript date libraries to help you choose.
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JavaScript date libraries provide user-friendly APIs and useful utilities that alleviate some of that pain. Wrangling dates and times in JavaScript can be a headache.