Timestamp Converter
Convert Unix timestamps to human-readable dates and back, in your browser.
Timestamp to date
- UTC (GMT)
- Your local time
- ISO 8601
- Relative
Date to timestamp
- Seconds
- Milliseconds
ToolsSoup's Timestamp Converter is a free online tool that turns Unix timestamps into human-readable dates and converts any date back into a Unix timestamp — all in your browser. Paste an epoch value in seconds or milliseconds to see the UTC, local, and ISO 8601 time, or type a date to get its timestamp instantly, with no uploads, no sign-up, and nothing ever leaving your device.
What is a Unix timestamp?
A Unix timestamp (also called epoch time or POSIX time) is the number of seconds that have elapsed since 00:00:00 UTC on 1 January 1970, not counting leap seconds. Because it is a single integer in a fixed time zone, it is an unambiguous, language-neutral way to store and compare moments in time. Many systems use milliseconds instead of seconds — JavaScript's Date.now(), for example, returns milliseconds — so this converter lets you pick the unit. A 10-digit value is almost always seconds, while a 13-digit value is milliseconds.
How to convert a timestamp online
Converting between timestamps and dates with ToolsSoup takes just a few seconds:
- Paste a Unix timestamp into the top box and choose Seconds or Milliseconds.
- Click Convert to date to see the UTC, local, ISO 8601, and relative time, or click Use current time to fill in the moment right now.
- To go the other way, type a date such as 2023-11-14 22:13:20 in the lower box and click Convert to timestamp, then copy the seconds or milliseconds value.
Seconds vs. milliseconds
The original Unix epoch counts whole seconds, which is what most back-end languages, databases, and APIs return. Browsers and many JavaScript APIs count milliseconds (seconds × 1000) for sub-second precision. If a converted date lands far in the future or the distant past, you probably picked the wrong unit — switch between Seconds and Milliseconds and convert again.
Why use this timestamp converter?
- 100% free with no ads, sign-up, or usage limits.
- Runs entirely in your browser — your data is never uploaded to a server.
- Converts both directions: timestamp to date and date to timestamp.
- Shows UTC, your local time zone, ISO 8601, and a friendly relative time.
- Handles both seconds and milliseconds epoch values.
- Works offline once the page has loaded.
Frequently asked questions
Is this timestamp converter free?
Yes. Every tool on ToolsSoup is completely free to use, with no account, sign-up, or hidden limits.
Is my data safe?
Absolutely. All conversion happens locally in your browser using JavaScript, so the values you enter are never sent to or stored on any server.
How do I know if my timestamp is in seconds or milliseconds?
Count the digits. A timestamp for a recent date has about 10 digits in seconds and about 13 digits in milliseconds. If the converted date looks wrong — decades off — switch the unit and convert again.
What time zone does the converter use?
It shows three views: UTC (the reference zone for Unix time), your browser's local time zone, and the standard ISO 8601 string, which is always in UTC and ends with a Z.
What date formats can I convert to a timestamp?
Anything your browser can parse, including ISO 8601 (2023-11-14T22:13:20Z), common date-and-time strings like 2023-11-14 22:13:20, and human dates like Nov 14 2023. If a value has no time zone, it is interpreted in your local time.