You have seen it in logs, databases, and JWTs: a number like 1754200000. That is a
Unix timestamp — and once you understand it, converting it becomes trivial. This guide shows how,
using the DevToolbox Timestamp Converter.
What is a Unix timestamp?
A Unix timestamp (or "epoch time") is the number of seconds since January 1, 1970, 00:00:00 UTC. It is a single, unambiguous number that does not depend on time zones or formatting conventions — which is exactly why servers and databases prefer it.
Why systems love it
- Universal — one integer, no locale or daylight-saving ambiguity.
- Sortable — later moments are simply larger numbers.
- Efficient — cheap to store and compare.
Converting epoch to a date
To read a timestamp, multiply by 1,000 to get milliseconds and feed it to a date function. The Timestamp Converter does this both ways:
- Paste the seconds into the "Unix timestamp" field.
- Click Convert to see UTC and your local time.
- Or pick a local date/time and click To Unix to get the epoch value.
Seconds vs milliseconds
Some systems (notably JavaScript Date.now()) use milliseconds.
If a timestamp looks ten digits too long, divide by 1,000. The converter shows both.
- What about leap seconds?
- Unix time ignores leap seconds; it counts continuous seconds since the epoch. Most applications never need to worry about this.
- Does the converter need the internet?
- No. All conversion happens in your browser — nothing is sent anywhere.