LocalToolsOffline browser tools collection

Category: Date & time

Timestamp Converter

Convert epoch time to ISO 8601 and local dates

Convert Unix timestamps in seconds or milliseconds into ISO 8601, your local time and back. Uses your device clock and time zone.

ISO 8601Invalid dateLocal timeInvalid dateUnix seconds—

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

What this tool does

A Unix timestamp counts the seconds since 1 January 1970 UTC, which is how most databases, APIs and log files store time. Paste a number in seconds or milliseconds, or a readable date, and every other representation is shown alongside it.

How to use it

  1. Paste a timestamp, or press Now for the current moment.
  2. You can also type a date such as 2025-03-14 09:00.
  3. Read the ISO, local and Unix values below.

Privacy

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

Frequently asked questions

Seconds or milliseconds?
Both work. Values of 13 digits or more are treated as milliseconds; shorter values are treated as seconds.
Which time zone is used?
The ISO value is UTC; the local value uses your device's own time zone setting.

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