What is epoch in milliseconds?

It is the number of milliseconds since 1 January 1970 UTC. JavaScript's Date.now() returns this value, which is 1000 times larger than the more common epoch-in-seconds.

Can it convert a date back to epoch milliseconds?

Yes. Switch to "Date to epoch ms" and enter any date the browser can parse, such as an ISO 8601 string, to get both milliseconds and seconds.

Yes. Conversion uses the browser's built-in Date object locally — no network calls are made and nothing is stored.

Epoch Milliseconds Converter

Convert between epoch milliseconds and human dates.

Epoch milliseconds converter

Work in both directions: paste an epoch timestamp in milliseconds to get a readable ISO 8601, UTC and local date — or type any date to get its epoch value back in both milliseconds and seconds.

Every output has a copy button, so you can grab exactly the format your code or database expects. The conversion uses the browser’s native Date object and runs entirely on your device.