JavaScript Date and Time Overview

JavaScript Dates

JavaScript's built-in Date object represents a moment in time as milliseconds since the Unix epoch (January 1, 1970 UTC). It handles dates, times, and timezones.

Example

const now = new Date();
console.log(now.toString());       // Human-readable local time
console.log(now.toISOString());    // "2024-06-15T10:30:00.000Z"
console.log(now.getTime());        // milliseconds since epoch

const epoch = new Date(0);
console.log(epoch.toISOString()); // "1970-01-01T00:00:00.000Z"

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Pro Tip

The built-in Date object has quirks (month is 0-indexed, parsing is inconsistent) — consider using Temporal API or a library for complex use cases.

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