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Category: Date & time

Unix Timestamp Converter

System ideaMissing a tool?

Convert epoch seconds, milliseconds and browser-supported dates

Convert Unix seconds or milliseconds to ISO 8601 UTC, local date-time and Unix seconds. Date strings depend on browser parsing; values are never uploaded.

ISO 8601Invalid dateLocal timeInvalid dateUnix seconds—

Everything on this page is processed in your browser. Nothing is uploaded.

What this tool does

This Unix timestamp converter treats integer values with 13 or more digits as milliseconds and shorter integers as seconds. It also accepts date-time strings supported by the browser's Date implementation. The output shows ISO 8601 UTC, the date and time in the browser's local locale, and Unix seconds; a Now button fills the current Unix timestamp. There is no selectable source or destination time zone, explicit microsecond or nanosecond support, batch or file input, date arithmetic, countdown, or duration calculator. Ambiguous free-form dates may parse differently between browsers. Values stay in the browser and are not uploaded to LocalTools.

How to use it

  1. Enter Unix seconds, an integer of 13 or more digits for milliseconds, or a browser-supported date-time string.
  2. Read the ISO 8601 UTC value, browser-local date-time and Unix seconds.
  3. Use Now for the current timestamp; no value is uploaded.

Privacy

This tool runs entirely in your browser. Your input is never uploaded, stored or shared — closing the tab removes it.

Frequently asked questions

What is a Unix timestamp?
It normally counts seconds since 1970-01-01 00:00:00 UTC. Some applications store the same timeline in milliseconds.
How do I convert epoch time to a date?
Enter the integer and the converter shows ISO 8601 UTC, your browser-local date and time, and Unix seconds.
Does the input use seconds or milliseconds?
Integers with 13 or more digits are treated as milliseconds; shorter integers are treated as seconds. A wrong unit is a common reason for an unexpected 1970 date.
Is Unix time based on my local time zone?
Unix time represents an instant independently of the local display. The tool shows UTC and browser-local time but has no selectable source or destination time zone.
Are timestamps or dates uploaded?
No. Parsing and formatting run locally in the current browser, so LocalTools does not receive the input or output.

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