Unix Timestamp Converter — Free, In Your Browser
Turn 1717243800 into a date, and back again.
Runs on your device What you paste is processed by your own browser. It is never sent to a server, and it is not stored anywhere after you leave the page.
Short answer
A Unix timestamp can be converted to a readable date, and a date back to a timestamp, for free in a web browser. Input in seconds or milliseconds is detected by digit count, and any date the browser can parse — an ISO 8601 string among them — is accepted in the other direction. The result lists the timestamp in both seconds and milliseconds, the ISO 8601 form, the full date in UTC or in your own time zone, and how long ago it was. Leaving the box empty gives the current moment.
At a glance
| Accepts | Unix seconds or milliseconds, or a date string |
|---|---|
| Produces | A breakdown in seconds, milliseconds, ISO 8601 and readable form |
| Processing | In your browser |
| Price | Free, no limits |
| Account | Not required |
Unix time counts the seconds since 1 January 1970 UTC, with no time zone and no daylight saving of its own. That is exactly why logs and APIs use it, and exactly why it is unreadable at a glance: a ten-digit integer carries no clue whether it refers to this morning or to a date three years ago.
The seconds-versus-milliseconds distinction causes most of the confusion. Unix tools, Postgres and most APIs speak seconds; JavaScript, Java and many logging stacks speak milliseconds. Reading a millisecond value as seconds puts the date somewhere in the year 56000, which is the usual sign of the mix-up.
How to use it
- 1
Paste a timestamp or a date
1717243800, 1717243800000, or 2024-06-01T12:10:00Z. Leave it empty for the current moment.
- 2
Choose the time zone
UTC, which is what the timestamp actually means, or your own zone for a date you can act on.
- 3
Convert
Seconds, milliseconds, ISO 8601, the full date and how long ago it was, all at once.
- 4
Copy what you need
Copy the whole breakdown, or download it as a text file.
Frequently asked questions
How does it know whether my number is seconds or milliseconds?
By digit count. Ten digits are read as seconds and thirteen as milliseconds, because both readings of a ten-digit number are plausible dates and only one of them is ever meant.
Which date formats can I paste?
Anything your browser can parse, which reliably includes ISO 8601 such as 2024-06-01T12:10:00Z. Ambiguous formats like 01/06/2024 are best avoided — whether that is June or January depends on the browser's locale.
Why does the local time differ from the UTC time?
Because they are the same instant described from two places. The timestamp itself has no zone; the local line applies your device's offset, including daylight saving, on that particular date.
Is anything I paste sent anywhere?
No. The conversion uses your browser's own date handling and stays entirely in the tab.