Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and dates to epoch time — free online.

About

About the Unix Timestamp Converter

Converts a Unix timestamp into a readable date in your local zone, UTC and ISO 8601, and works the other way too.

Developers use it to decode a timestamp from an API response or a log file into a date they can actually read, while support and QA teams use it to convert an incident time into the exact seconds value a bug report or database query needs. It's one of many free converters on Toolapt, and like every tool here, it's free to use with no sign-up and no limit on how many times you run it.

Choose what to view about this tool

Guide

Using the Unix Timestamp Converter

  1. 1

    Step 1

    To read a timestamp: type it into the Timestamp field, choose Seconds, Milliseconds or Detect automatically, and see the decoded date instantly.

  2. 2

    Step 2

    Click "Use now" to fill in the current timestamp and date automatically.

  3. 3

    Step 3

    To go the other way: pick a date and time in the second panel to see its Unix seconds and milliseconds.

  4. 4

    Step 4

    Copy either value with its own button, or click Clear to start over.

  • Shows the current Unix time updating live every second, so you always have a reference point
  • Converts a timestamp to date in four formats at once — local time, UTC, ISO 8601 and a relative phrase
  • Auto-detects whether a pasted timestamp is in seconds or milliseconds, or lets you force either one
  • Converts a picked date and time back into Unix seconds and milliseconds, in the same tool
  • Works entirely in your browser — no installs and no sign-up
  • Free to use, with no limit on how many times you run it
  • Fully responsive, so it works just as well on a phone as on a desktop

Developers

Developers use the Unix Timestamp Converter for decoding a timestamp from an API response, log file or database record into a readable date.

Support and QA teams

Support and QA teams use the Unix Timestamp Converter for converting an incident's reported time into the exact Unix seconds a bug report or query needs.

Data analysts

Data analysts use the Unix Timestamp Converter for spot-checking timestamp columns in a dataset without opening a script or spreadsheet formula.

Anyone scheduling across time zones

Anyone scheduling across time zones uses the Unix Timestamp Converter for confirming what a specific timestamp means in their own local time.

Examples

Unix Timestamp Converter examples

3 worked examples

01

Decoding an API timestamp

Paste 1750000000 into Timestamp with Unit set to Seconds, and it decodes to 2025-06-15T15:06:40Z in UTC, alongside the equivalent in your own local time zone.

02

Detecting seconds vs milliseconds automatically

Paste 1750000000000 with Unit set to "Detect automatically," and it's correctly read as milliseconds — the same instant, 2025-06-15T15:06:40Z — instead of being misread as seconds far in the future.

03

Converting a date to Unix time

Pick 2025-01-01 00:00:00 in the UTC zone in the date panel to get Unix seconds of 1735689600 and Unix milliseconds of 1735689600000.

Related tools

Roman Numeral Converter

Numbers to Roman numerals and back, from 1 to 3999.

Use it

Text, Binary and Hex Converter

Convert plain text to binary or hexadecimal bytes (UTF-8), and back again.

Use it

Number to Words Converter

Spell out a number in English words, including decimals and negatives.

Use it

Time Zone Converter

Convert a date and time between time zones, and see the current time around the world.

Use it

Shoe Size Converter

Convert shoe sizes between US, UK, EU and foot length in centimetres.

Use it

Aspect Ratio Calculator

Simplify a width and height into a ratio, or find a missing dimension.

Use it

FAQ

Frequently asked questions

Quick answers to common questions about the Unix Timestamp Converter.

What does the Unix Timestamp Converter do?

It decodes a Unix timestamp into a readable date (local time, UTC, ISO 8601 and a relative phrase), and converts a date and time you pick back into Unix seconds and milliseconds.

Is the Unix Timestamp Converter free to use?

Yes. It's free, with no sign-up, no watermark and no limit on how many times you use it.

Is my input safe when I use this tool?

Yes. The timestamp or date you enter is processed entirely on your own device — nothing is sent to a server.

What is a Unix timestamp?

It's the number of seconds (or milliseconds) that have passed since January 1, 1970, 00:00:00 UTC — the standard way computers store a point in time internally.

How does the tool know if my timestamp is seconds or milliseconds?

With "Detect automatically" selected, it checks the size of the number — a value large enough that it could only be milliseconds is read that way, otherwise it's read as seconds. You can also force either unit.

What time zone are the results shown in?

Local-time results use your browser's detected time zone; the UTC and ISO 8601 rows show the same instant in Coordinated Universal Time so you can compare the two.

Can I use the Unix Timestamp Converter on my phone?

Yes. The page is fully responsive and works on mobile, tablet and desktop browsers alike.

Does the Unix Timestamp Converter have any limitations?

It handles the standard JavaScript date range, which comfortably covers real-world timestamps; extremely far past or future values outside that range aren't supported.

Still have a question? Contact us

Report a problem

Unix Timestamp Converter

What went wrong?
    or paste a screenshot