What is the difference between seconds and milliseconds timestamps?

A milliseconds timestamp is 1,000 times larger than the equivalent seconds timestamp, and typically has 13 or more digits for recent dates.

What happens on January 19, 2038?

That date is the well-known limit for 32-bit signed Unix timestamps in seconds — modern 64-bit systems, and this tool, are unaffected.

Is my timestamp data sent anywhere?

No — conversion happens entirely in your browser.

Can I convert a negative timestamp?

Yes — negative Unix timestamps representing dates before 1970 are supported.

Does this show my local time zone?

Yes — results include your browser's detected local time zone alongside UTC.

What if I choose the wrong unit?

The resulting date will be wildly incorrect (typically far in the past or future) — switch the unit and check again.

Time & Date Tools

Unix Time Converter

Enter a Unix epoch timestamp and choose its unit to see the matching calendar date and time.

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Runs in Your Browser
Instant Results
100% Private

Your Text

Timestamp unit

Your result will appear here.

Learn More

What Is Unix Time?

Unix time (or epoch time) counts the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC — a simple, time-zone-independent way for computers to represent a specific moment as a single number.

This tool converts a Unix timestamp — in either seconds or milliseconds, whichever your system uses — into a readable calendar date, shown in ISO 8601, UTC and your local time zone.

Who Uses This Tool?

For Business

Convert a Unix epoch value from an API response into a readable date.

For Personal Use

Figure out what real-world date a Unix timestamp represents.

For Students

Learn how Unix epoch time works for a systems or networking course.

For Offices

Convert a timestamp stored in a database field into a readable date.

Why Use This Tool

Key Features

Seconds or Milliseconds

Choose the unit your timestamp uses.

Multiple Output Formats

See ISO 8601, UTC, local time and a relative format at once.

Instant Conversion

Results update immediately as you type.

100% Private

Converted entirely in your browser — nothing is transmitted.

The Payoff

Benefits

No Ambiguity

Explicitly choose seconds or milliseconds instead of guessing.

See Every Format at Once

ISO, UTC, local and relative time, all in one result.

No Software Needed

Convert directly in the browser — no script or spreadsheet formula required.

Step by Step

How to Use Unix Time Converter

Enter a Unix Timestamp

Type the epoch timestamp you want to convert.

Choose Seconds or Milliseconds

Select the unit your timestamp uses.

Read the Converted Date

See the matching calendar date in every common format.

Specifications

Technical Details

Detail	Value
Input	Unix timestamps in seconds or milliseconds
Processing	Not applicable — single timestamp conversion
Output	Exact conversion using your browser's native Date object

You Can Verify This

Privacy & Security

What actually happens to your file when you use this tool.

100% Client-Side

This tool runs entirely inside your browser using JavaScript — nothing you type or generate is ever sent anywhere.

No Upload, Ever

There is no file upload and no server processing step — your data never leaves your device.

Works Offline

Once this page has loaded, the tool keeps working even without an internet connection.

Nothing Stored

Nothing you enter is saved on our servers — refreshing the page clears everything.

No Tracking of Your Input

We have no way to see what you type, generate or convert with this tool.

Get Better Results

Tips

Check Your API's Documentation for the Unit

Different systems use seconds or milliseconds inconsistently — check the source before converting.

Use This to Sanity-Check Expiry Timestamps

Quickly confirm a token or session expiry timestamp is in the future, not the past.

Frequently Asked Questions