Timestamps in JavaScript: Date, Date.now(), and Intl Explained
Work with timestamps in JavaScript: Date objects, Date.now(), parsing strings, formatting with Intl.DateTimeFormat, and avoiding common pitfalls.
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Tags: developer-tools, timestamps, javascript
Timestamps in JavaScript: Date, Date.now(), and Intl Explained JavaScript's date handling has a complicated reputation — and it earned it. The object is mutable, timezone-naive in most methods, and has a months-are-zero-indexed quirk that has bitten every JavaScript developer at least once. This guide cuts through the confusion: here is what each method does, when to use it, and what is coming with the Temporal API. Creating Date Objects The month indexing trap: is April 15, not March 15. Month is January, month is December. This has no good explanation — it is just how it was implemented in 1995 and cannot change without breaking the web. --- Extracting Values from a Date Rule: Prefer methods in application logic. Use local methods only when you specifically want the user's local…
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