What is a Unix timestamp?

Seconds (or milliseconds) since 1970-01-01 00:00:00 UTC.

Does it handle milliseconds?

Yes. Numbers larger than about 1 trillion are treated as milliseconds.

Yes. toLocaleString and datetime-local use the browser's local time.

Convert between Unix timestamps (seconds or milliseconds) and human-readable local dates. Shows current time and handles invalid input.

Now

10/28/2026, 11:14:12 AM

Timestamp (s): 1793186052

Timestamp (seconds or ms)

Local date

11/14/2023, 10:13:20 PM

2023-11-14T22:13:20.000Z

Date (local or ISO)

Timestamp (seconds)

1699999980

In milliseconds: 1699999980000

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Tool guide

Practical information to understand the result and use this tool correctly.

Unix timestamps count seconds (or milliseconds) since 1970-01-01 UTC.

Values under about 1e12 are treated as seconds; larger as milliseconds.

Results use the browser's local timezone.

What is a Unix timestamp?: Seconds (or milliseconds) since 1970-01-01 00:00:00 UTC.
Does it handle milliseconds?: Yes. Numbers larger than about 1 trillion are treated as milliseconds.
Is the date in my local timezone?: Yes. toLocaleString and datetime-local use the browser's local time.