How to Get Unix Timestamp in JavaScript (Seconds vs Milliseconds)

Working with dates and timestamps in JavaScript can be slightly confusing because JS handles time in milliseconds, whereas standard Unix timestamps use seconds. Here is a quick reference guide to handle both correctly. Get Current Timestamp in Milliseconds By default, JavaScript's Date.now() returns the current timestamp in milliseconds:const timestampMs = Date.now(); console.log(timestampMs); // Output: 1726053000000 Get Current Timestamp in Seconds (Standard Unix) To convert it to standard Unix seconds, divide by 1000 and use Math.floor():const timestampSec = Math.floor(Date.now() / 1000); console.log(timestampSec); // Output: 1726053000 Convert Unix Timestamp Back to Date If you have a Unix timestamp in seconds, multiply it by 1000 before passing it to new Date():const unixTimestamp = 1726053000; const date = new Date(unixTimestamp * 1000); console.log(date.toISOString()); Need a quick online tool to convert timestamps or test timezones? I built a fast, zero-bloat web tool to convert dates, timestamps, and timezones instantly: 👉 timestampeasy.com