Unix Timestamp Converter
Unix timestamps to readable dates and back — seconds or milliseconds, auto-detected.
Unix timestamps are everywhere in development — API responses, log lines, JWT exp claims, database rows — and completely unreadable to humans. Paste one and instantly see local time (with your timezone named explicitly), UTC, ISO 8601, and a relative “3 hours ago” reading. The tool detects whether the value is seconds or milliseconds from its magnitude and tells you which it assumed.
The reverse direction works too: pick a date and time and get the Unix timestamp in both seconds and milliseconds, with a live-ticking current timestamp for quick reference. Conversion is pure client-side arithmetic — nothing is sent to a server, and the page keeps working offline.
How to convert a Unix timestamp
- 1
Paste the timestamp — seconds or milliseconds are detected automatically.
- 2
Read the local, UTC, ISO 8601, and relative versions, and copy any of them.
- 3
Or go the other way: pick a date and time to get its epoch seconds and milliseconds.
Why use Nofolo’s unix timestamp converter?
Seconds vs milliseconds auto-detect
The unit is inferred from magnitude and stated plainly — with a manual override if you know better.
Every format at once
Local time, UTC, ISO 8601, and a relative reading, each one a click away from your clipboard.
Reverse conversion
Pick a date and time to get epoch seconds and milliseconds instantly.
Live current timestamp
A ticking now — in seconds and milliseconds — for quick copy while debugging.
Explicit timezone
Your browser timezone is named on every local result, so there is no guessing.
Offline and private
Pure client-side math — timestamps are never transmitted anywhere.
Frequently asked questions
What is a Unix timestamp?
The number of seconds since 00:00:00 UTC on 1 January 1970 — the Unix epoch — ignoring leap seconds. It is the standard machine representation of a moment in time.
How do I know if a timestamp is in seconds or milliseconds?
Length is the giveaway: current times are 10 digits in seconds (about 1.7 billion) and 13 digits in milliseconds. This tool assumes values of 100 billion or more are milliseconds, labels the assumption, and lets you override it.
What timezone are the results in?
The local line uses your browser’s timezone and names it explicitly; the UTC and ISO 8601 lines are always UTC. The timestamp itself has no timezone — it identifies the same instant everywhere on Earth.
What is the year 2038 problem?
Systems that store seconds in a signed 32-bit integer overflow on 19 January 2038. Modern 64-bit systems and JavaScript (which tracks milliseconds in 64-bit floats) are unaffected, but old embedded systems and file formats may be.
Does this tool need a server or internet connection?
No. Conversion is simple arithmetic done in your browser — timestamps are never transmitted, and the converter keeps working offline.
Related tools
Date Calculator
Days between two dates — or add and subtract time from any date, calendar-accurately.
Age Calculator
Your exact age in years, months, and days — plus a countdown to your next birthday.
JWT Decoder
Decode a JWT’s header and payload, read the claims, and check expiry — without the token leaving your browser.
JSON Formatter
Format, validate, and minify JSON with instant error pinpointing.