Timestamp converter

Unix time to a calendar date and back, in every format at once. Live clock included.

Runs entirely in your browser. Nothing you enter here is sent to the server.

This tool needs JavaScript

It does its work in your browser, which is exactly why it cannot fall back to the server: that would mean sending your input somewhere. With scripting off there is nothing for it to run on.

Now

Unix seconds: —
Local time: —

Ticking. It pauses while you are typing in a field below.

Convert

Unix timestamp

Seconds, milliseconds or microseconds — detected from the size.

Date and time

Read the picker as UTC instead of local time

Or type a date

ISO 8601, YYYY-MM-DD HH:MM:SS, or anything your browser understands.

The same moment, every way

Unix seconds: —
Unix milliseconds: —
ISO 8601 (UTC): —
ISO 8601 (local): —
RFC 2822 / HTTP: —
SQL datetime (UTC): —
Local, spelled out: —
Relative: —
Weekday: —
Day of year: —
ISO week: —
Your timezone: —

What Unix time actually counts

Unix time is the number of seconds since 1 January 1970, 00:00:00 UTC. It has no timezone: the same instant is the same number everywhere on Earth. Everything on this page is that one number, formatted differently.

Seconds, milliseconds, microseconds

Different systems count in different units and none of them label it. The unit is guessed from the magnitude: today's time in seconds is ten digits, in milliseconds thirteen, in microseconds sixteen. The guess is shown, so you can see when it is wrong. This is the single most common bug in date handling — a timestamp read in the wrong unit lands in 1970 or in the year 55000.

Timezones

The picker uses your computer's timezone unless you tick the UTC box. "ISO 8601 (local)" carries your offset, which is the format to store if a local wall-clock time matters. Plain UTC is what to store otherwise.

Leap seconds do not exist in Unix time — it repeats a second rather than counting it. Days before 1970 are negative and work fine here.

The clock pauses while a field has focus, so a value you are half-way through typing is not overwritten. That behaviour came from the old tool and it was worth keeping.

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