Unix Timestamp Converter
Convert Unix epoch timestamps to readable dates and back online, in seconds or milliseconds. Free and in your browser, no upload.
What this tool does
Turn a Unix timestamp into a human date, or a date into a timestamp. The converter detects seconds versus milliseconds automatically and shows the ISO, UTC, local and relative forms at once. A "Now" button fills in the current epoch. Everything runs in your browser, with no clock sent anywhere.
Building or debugging an API? Pair this with UUID Generator and JSON Formatter.
What you can use it for
- Read a timestamp from a log or database into a real date.
- Get the current epoch in seconds for an API call.
- Check whether a token expiry is in the past or the future.
- Convert a date into the timestamp a system expects.
How to use it
- Type a Unix timestamp to see the date forms it maps to.
- Or type a date to get the epoch in seconds and milliseconds.
- Use the "Now" button to grab the current timestamp.
- Copy any value with the button next to it.
Everything runs inside your browser. No file is uploaded to any server. See more tools in this field.
Pairs well with
Other tools people reach for in the same flow.
- UUID Generator and Validator
work with UUIDs
Strong fit in developer workflows.
- JSON Formatter and Validator
format and validate JSON
Strong fit in developer workflows.
- Base64 Encoder and Decoder
encode and decode Base64 text
Strong fit in developer workflows.
- JWT Decoder: Read Token Payload
decode a JWT header and payload
Strong fit in developer workflows.
Related tools
DeveloperUUID Generator and Validator
Generate, validate and convert UUIDs online: v4, v5, v7, NIL and MAX. Instant and free, in your browser, no upload to any server.
JSON Formatter and Validator
Format, validate and minify JSON online. Beautify messy JSON or compact it in one click, free and entirely in your browser, no upload.
Base64 Encoder and Decoder
Encode and decode Base64 text online, with an optional URL-safe alphabet. Runs in your browser, nothing is uploaded to a server.
Regex Tester and Debugger
Test and debug regular expressions online in real time, with capture groups and live match highlighting. Free and in your browser, no upload.
Frequently asked questions
Seconds or milliseconds, how does it know?
It uses the size of the number: values of about 1e12 or larger are read as milliseconds, smaller ones as seconds. That matches how almost every system stores epochs after the year 2001.
What time zone are the dates in?
The ISO and UTC lines are always in UTC, so they are unambiguous. The local line uses your browser time zone, and the relative line is phrased against the current moment.
What date formats can I paste?
Anything your browser understands, such as ISO 8601 like 2026-06-04T10:30:00Z, or common forms like 2026-06-04. If a date cannot be parsed, you will see a short error.