All toolsFNDRY39 Unix Timestamp Converter

Ten digits in, a real moment out.

Paste a unix timestamp and get the moment it names — your local time, UTC, ISO 8601 and how long ago that was. Or go the other way: pick a date and time and get the epoch seconds. It says plainly whether your number was read as seconds or milliseconds, and nothing you type leaves your browser.

Which way

Timestamp → date

Date → timestamp

Unix timestampSeconds or milliseconds — twelve digits or more reads as milliseconds.

How does it work?

Type in what you know
Fill in the fields. There is nothing to upload because there is nothing to send — the numbers you enter never leave this tab.
Converted as you type
The arithmetic runs in your browser, on your own device, and the answer updates with every keystroke. Nothing is sent anywhere — so there is no record of what you earn, what you owe, or what you are thinking of buying.
Copy the result
One press puts it on your clipboard, ready to paste where you need it. There is no file to download — the result is text, not a document. Nothing is remembered — reload and the fields go back to their defaults, so copy anything you want to keep.

Frequently asked questions

How does it know whether I pasted seconds or milliseconds?: By size. Twelve digits or more reads as milliseconds, anything shorter as seconds — read as seconds, a twelve-digit number would be the year 5138. The result names the assumption out loud, so a wrong guess is visible rather than silent. The one genuine ambiguity is a millisecond stamp from before March 1973, which is short enough to be misread; if an answer looks off by a factor of a thousand, that’s why.
Which time zone does the conversion use?: Timestamps themselves have none — a unix timestamp counts seconds since 1 January 1970 UTC, the same number everywhere on Earth. The tool shows the moment in your device’s zone and in UTC side by side, and converting a date to a timestamp uses your device’s zone, which is what you almost always mean.
What week-numbering rule does the week number use?: ISO 8601: weeks run Monday to Sunday, and week 1 is the week holding the year’s first Thursday. That’s why 29–31 December can belong to next year’s week 1, and 1–3 January to the old year’s week 52 or 53. A North American calendar that starts weeks on Sunday will sometimes disagree by one — this tool follows the standard.
Can it handle negative timestamps?: Yes. Negative numbers count backwards from 1970, so −86400 is 31 December 1969. Anything a JavaScript date can represent — about 275,760 years either side of 1970 — works; beyond that it says so instead of guessing.
Does my timestamp get sent anywhere?: No. The whole conversion runs in your browser — there’s no server doing the arithmetic and nothing you type leaves the page.

Ten digits in, a real moment out.

How does it work?

Type in what you know

Converted as you type

Copy the result

Frequently asked questions

JSON Formatter

JSON ↔ CSV Converter

Base64 Encoder & Decoder

URL Encoder & Decoder

Ten digits in, a real moment out.

How does it work?

Type in what you know

Converted as you type

Copy the result

Frequently asked questions

JSON Formatter

JSON ↔ CSV Converter

Base64 Encoder & Decoder

URL Encoder & Decoder

Ten digits in, a real moment out.

How does it work?

01Type in what you know

02Converted as you type

03Copy the result

Frequently asked questions

More free tools

JSON Formatter

JSON ↔ CSV Converter

Base64 Encoder & Decoder

URL Encoder & Decoder

Ten digits in, a real moment out.

How does it work?

01Type in what you know

02Converted as you type

03Copy the result

Frequently asked questions

More free tools

JSON Formatter

JSON ↔ CSV Converter

Base64 Encoder & Decoder

URL Encoder & Decoder

Type in what you know

Converted as you type

Copy the result

Type in what you know

Converted as you type

Copy the result