Unix Timestamp Converter

Paste a timestamp and read it as a date in your zone, in UTC and in any other zone, with the ISO 8601 and RFC 2822 forms, the seconds and milliseconds, how long ago it was and the day and week of the year, each with a copy button. Seconds, milliseconds, microseconds and nanoseconds are told apart automatically. Type a date and time in a chosen zone to get its timestamp. The current epoch time ticks at the top. Everything runs in your browser from your device's clock and zone data.

How it works

Unix Timestamp Converter is a web page that does its work on your own device. Everything you type or choose is worked out by your browser and never sent to a server, so nothing is stored and there is nothing to delete. There is no account, no sign-up and no limit on how often you use it.

Straight to one job

Epoch Converter · Timestamp to Date

What a Unix timestamp is

A Unix timestamp is the number of seconds since midnight on 1 January 1970, UTC, with no time zone and no daylight saving in it. Computers store moments this way because arithmetic on it is trivial and it means the same instant everywhere; people cannot read it, which is why this page exists. Many systems keep milliseconds instead (13 digits rather than 10), and some microseconds or nanoseconds; the converter tells them apart by length, so a value pasted from a log, a database or an API reads correctly whichever it is. A date typed in ISO form, such as 2026-10-05T12:00:00Z, is accepted too.

Time zones

The same timestamp is a different wall-clock time in every zone, and the right zone depends on where the reader is, not where the server was. Show in lets you pick any zone your browser knows, with your own zone first; the ISO line carries the zone's offset at that moment, which changes with daylight saving, and the UTC line is the same instant with no offset. Going the other way, the date and time you type are taken to be in the zone you choose and converted to the single instant they name, including the offset in force on that date. The zone data comes from your browser and operating system, which keep it up to date.

The other lines

RFC 2822 is the date form used in email headers and HTTP. The relative line says how far the moment is from now. The day of the year and the ISO week number are the ones that scheduling and payroll systems use; ISO weeks start on Monday and week 1 is the week with the year's first Thursday. Right now at the top updates every second from your device's clock, so it is as accurate as that clock.

What this tool does not do

• It does not read leap seconds, which Unix time ignores by design, or dates before the year 1 or beyond the year 275760, the limits of JavaScript dates.
• It does not know which unit a 12-digit value is; values are read by length, so check the note under the box when a date looks wrong.

What it does

• Seconds, milliseconds, microseconds or nanoseconds, told apart by length
• Any time zone, with your own first, and UTC always shown
• ISO 8601 with offset, RFC 2822, relative time, day and ISO week of the year
• Date and time in a chosen zone to a timestamp, daylight saving handled
• Current timestamp in seconds and milliseconds, updating every second
• Copy button on every value
• No upload, no account, no sign-up

Questions

What is Unix time?

The number of seconds since 1 January 1970 at 00:00 UTC, not counting leap seconds. It is the same number everywhere in the world for a given instant, which is why servers, databases and APIs store time this way.

Is my timestamp in seconds or milliseconds?

Ten digits is seconds (the current time is about 1.78 billion), thirteen is milliseconds, sixteen microseconds and nineteen nanoseconds. The converter reads the unit from the length and says which it used under the box.

How do I convert a timestamp to a date in Excel or Google Sheets?

For seconds: =A1/86400+DATE(1970,1,1), then format the cell as a date; divide by 1000 first for milliseconds. The result is in UTC; add or subtract your zone's hours to adjust.

Why does the date differ from what my server shows?

A timestamp has no zone; the date you see depends on the zone it is shown in. Set Show in to the server's zone, or compare the UTC line, which is the same everywhere.

How do I get the timestamp for a date?

Under Date to timestamp, set the date, the time and the zone the time is meant in. The seconds and milliseconds are worked out for that instant, with daylight saving taken into account.

What is the ISO week?

The week numbering used in Europe and in many scheduling systems: weeks start on Monday and week 1 is the week containing the year's first Thursday, so 1 January can fall in week 52 or 53 of the previous year.

Is anything sent to a server?

No. Your browser does the conversion with its own clock and zone data. Nothing you type is sent to us or stored.

Is it free?

Yes, completely free, with no sign-up.

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