Timestamp ConverterUnix, ISO, and local date conversion
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Convert timestamps across Unix, ISO, UTC, and local time

Enter seconds, milliseconds, ISO text, or choose a local date to get copyable time values instantly.

Unix seconds
1781318381
Unix milliseconds
1781318381000
UTC ISO
2026-06-13T02:39:41.000Z
Local time
6/13/2026, 2:39:41 AM
Time zone
UTC
Detected input
Unix seconds

Quick answer

A Unix timestamp is the number of seconds or milliseconds since 1970-01-01 00:00:00 UTC. This converter accepts 10-digit Unix seconds, 13-digit Unix milliseconds, ISO 8601 strings, and local date input, then returns UTC ISO, local time, Unix seconds, and Unix milliseconds in the browser.

How to use

  1. 1. Paste a timestamp or dateUse a 10-digit Unix seconds value, a 13-digit milliseconds value, an ISO 8601 string, or the local date picker.
  2. 2. Check the detected formatThe result panel shows whether the input was interpreted as seconds, milliseconds, an ISO date, or another browser-parsed date string.
  3. 3. Copy the format you needCopy Unix seconds for APIs, milliseconds for JavaScript, UTC ISO for logs, or local time for human-readable reports.

Examples

Unix seconds to UTC

Input
1700000000
Output
2023-11-14T22:13:20.000Z

10-digit values are treated as seconds and multiplied by 1,000 for JavaScript Date.

Unix milliseconds to UTC

Input
1700000000000
Output
2023-11-14T22:13:20.000Z

13-digit values are already milliseconds.

ISO 8601 to Unix timestamp

Input
2026-05-31T12:00:00Z
Output
Unix seconds: 1780228800

Common use cases

  • Debug API fields named created_at, expires_at, iat, nbf, or exp
  • Convert log timestamps between UTC and local time during incident review
  • Check whether a scheduled job uses seconds, milliseconds, or ISO strings
  • Create copyable time values for documentation, test fixtures, and database rows

Edge cases

  • A 13-digit timestamp is usually milliseconds; a 10-digit timestamp is usually seconds
  • Local time depends on the browser time zone, while UTC ISO always ends in Z
  • Date strings without an explicit time zone may be interpreted as local browser time
  • Very old or far future dates can differ across systems that store timestamps in limited integer ranges

Features

  • Convert between Unix seconds, milliseconds, and ISO 8601 date strings
  • Show local time and UTC ISO simultaneously
  • Auto-detects input format
  • Local-only — no API call

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Frequently asked questions

What formats are accepted?
Unix seconds, Unix milliseconds, ISO 8601 strings, and most common date strings parsable by the browser's Date API.
Does it show local and UTC time?
Yes. Both local time and UTC ISO are displayed alongside the Unix value.
Is the conversion done online?
No. Conversion runs in your browser using the native Date API — nothing is sent to a server.