What is Unix epoch time / milliseconds since epoch?

Unix epoch time is the number of milliseconds (or seconds) that have elapsed since 00:00:00 UTC on 1 January 1970. It is the standard way computers represent a point in time, independent of timezone.

Can this tool convert dates before 1970 or negative epoch timestamps?

Yes. Milliseconds before the Unix epoch are represented as negative numbers, and theMilliseconds supports converting them in both directions - milliseconds to date-time and date-time to milliseconds - for any date within JavaScript's supported date range.

Is theMilliseconds free and ad-free?

Yes. theMilliseconds is completely free to use, has no ads, and does not require an account or sign-up.

Does my data ever leave my browser?

No. theMilliseconds runs entirely client-side in your browser. It does not send, store, or share any data you enter, paste, or convert with any server or third party.

Can I convert a timestamp to a specific timezone?

Yes. You can pick any country or IANA timezone from the built-in searchable list, and theMilliseconds will show the corresponding date and time in that zone, correctly accounting for daylight saving time.

How do I calculate the difference between two timestamps?

Switch to the Difference tab, enter two millisecond values (or use the Now button or paste), and theMilliseconds instantly shows the difference in milliseconds as well as a human-readable days/hours/minutes/seconds breakdown.

Can I see the current time in multiple timezones at once?

Yes. The World Clock tab lets you pin any number of timezones and see them all update live, side by side with their UTC offsets. Pinned timezones are saved in your browser so they're still there next time you visit.

Can I convert many timestamps at once?

Yes. The Bulk tab accepts a pasted list of epoch values or date strings (one per line), converts every line at once using the timezone you choose, and lets you download the results as a CSV file.

Does theMilliseconds work offline?

Yes. theMilliseconds is a Progressive Web App - once you've visited it, the app shell is cached by your browser so it keeps working without an internet connection, and it can be installed to your home screen or desktop like a native app.

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Convert epoch milliseconds to date-time and back, in any timezone

UTC

01-Jan-1970, 00:00:00 GMT

Local

01-Jan-1970, 05:30:00

Unix (ms)

1647599958899

MILLISECONDS TO DATE TIME

Enter Milliseconds

UTC Date Time

Local Date Time

ISO 8601 (UTC)

DATE TIME TO MILLISECONDS

Enter Date

Enter Time

Milliseconds Since Epoch

UTC Equivalent

MINUEND

Enter Milliseconds

Local Date Time

SUBTRAHEND

Enter Milliseconds

Local Date Time

MILLISECONDS DIFFERENCE

TIME DIFFERENCE

BULK CONVERSION

Paste one epoch value or date per line - each line is auto-detected and converted using the timezone below.

Results will appear here after you click "Convert All".

Input	Timezone	UTC Date Time	Region Date Time	Epoch (ms)

You have copied a text.

What is a Millisecond and the Unix Epoch?

A millisecond is a unit of time in the International System of Units equal to one thousandth of a second and to 1000 microseconds.

Time is calculated since the "Unix Time" reference point: 1st January 1970, 00:00:00 UTC. The Unix epoch is the number of milliseconds calculated since that reference point - a value that is independent of timezone, and can be negative for any date before 1 January 1970.

What does theMilliseconds do?

theMilliseconds decodes time stored in the millisecond-epoch format used by most databases and APIs. Convert milliseconds to date-time and back, in the timezone of your choice, and calculate the precise difference between two timestamps.

For example: if a record was saved in India, its stored millisecond value reflects the Indian timezone. A developer inspecting the same value from Prague would see a different local date-time unless they explicitly convert it to India's timezone. Milliseconds: 1674377411423 reads as Sunday, 22-Jan-2023, 14:20:11 in India, but Sunday, 22-Jan-2023, 09:50:11 in Prague (both 24-hour format) - exactly the kind of mismatch this tool exists to resolve.

How to enable Pasting

Your data and privacy are crucial to us. Nothing you paste is read except the text you explicitly paste into a field - and none of it is ever sent anywhere, since this site has no backend at all. Your browser still requires you to "Allow" clipboard access the first time, which is a browser-level permission prompt, not something this site controls.

Enabling From the Prompt

Click "Allow" on the prompt that appears after clicking a paste button. Browser clipboard permission prompt

Enabling Manually From Settings

Open your browser's Settings.
Search for "Site Permissions" and open that.
Search for "Clipboard" and click on it.
Remove https://themilliseconds.netlify.app/ from the Block section.
Add it to the Allow section instead.
Refresh the page once.

theMilliseconds is under active, ongoing improvement - new features and refinements are added regularly (see the version info in the site menu for what's most recently changed). It does not take responsibility for any incorrect results for any specific timezone anywhere on the site.

Users are not permitted to manipulate any content of this website through inspection tools. The time shown may not be correct for every user's requirement or timezone; theMilliseconds and its owner take no responsibility for any incorrect data.

No data is collected or shared with any third party.

Follow the developer:

Enter Milliseconds JavaScript Python SQL Java

UTC Date Time

Local Date Time

ISO 8601 (UTC)

Enter Date

Enter Time

Milliseconds Since Epoch JavaScript Python SQL Java

UTC Equivalent

Enter Milliseconds

Local Date Time

Enter Milliseconds

Local Date Time

Select Time Zone

Select Time Zone

Select Time Zone

Select Time Zone

Pin a Timezone

Select Time Zone

Enter Milliseconds

Milliseconds Since Epoch