Free browser tool

Timestamp Converter for Unix, ISO & Local Time

Convert epoch timestamps, milliseconds, ISO strings, UTC dates, and local time formats for logs, APIs, databases, and documentation.

Privacy note: This tool is marked browser-side in the tool registry. It works with generated values or pasted input rather than a required local file upload. No account is required for this public tool. Review data handling.

Timestamp input

Enter Unix seconds, Unix milliseconds, ISO text, or a readable date.

Try a common timestamp

Timestamp or date

Parsed with your browser locale and time zone settings.

Converted formats

Copy timestamps for logs, APIs, databases, and docs.

Unix seconds

1783049415

Unix milliseconds

1783049415000

ISO 8601

2026-07-03T03:30:15.000Z

Local time

Jul 3, 2026, 11:30:15 AM GMT+8

UTC

Fri, 03 Jul 2026 03:30:15 GMT

Quick answer

A timestamp converter turns machine time values into readable UTC, local, ISO, seconds, and milliseconds formats.

Unix time usually means seconds since January 1, 1970 at 00:00:00 UTC.

Best inputs for timestamp conversion

Know seconds vs milliseconds

JavaScript dates use milliseconds, while many APIs and logs use Unix seconds.

Prefer ISO for sharing

ISO and UTC output are easier to compare across devices, teams, and time zones.

Timestamp method

Numeric timestamps are converted into JavaScript Date values.

Short numeric values are read as Unix seconds. Longer numeric values are read as Unix milliseconds.

Text values are parsed by the browser date parser.

Local context

Local time depends on the current browser and system time zone.

UTC and ISO output are useful when you need stable cross-region values.

Timestamp conversion example

Translate between machine timestamps and readable dates.

Example

Paste a Unix timestamp from a log entry and copy the ISO date for a report.

Assumption

Very large numeric values are interpreted as milliseconds.

Limitation

Ambiguous date text can parse differently across browser environments.

Common mistakes to avoid

These checks help prevent bad outputs, failed exports, and confusing results.

Seconds vs milliseconds

A 10-digit Unix value is usually seconds, while 13 digits is usually milliseconds. Mixing them shifts dates by decades.

Trusting ambiguous text

Date strings like 05/06/2026 can parse differently by locale. Prefer ISO strings when sharing values.

Ignoring local time zones

Local output depends on the device time zone. Use UTC or ISO when comparing logs across teams.

Overlooking DST changes

Daylight saving transitions can make local wall-clock times look surprising. Use UTC when comparing exact instants.

Common use cases

Use timestamp conversion when machine time needs to become readable.

Log debugging

Translate epoch values from application logs into readable dates.

API testing

Convert ISO dates and Unix values while checking request and response examples.

Database review

Inspect created_at, updated_at, and event time fields copied from records.

Documentation

Copy stable UTC or ISO values into reports, runbooks, and tickets.

Frequently asked questions

What is Unix time?

Unix time counts seconds since January 1, 1970 at 00:00:00 UTC.

Why are there seconds and milliseconds?

Many APIs use seconds, while JavaScript Date values use milliseconds.

Can I copy the converted values?

Yes. Each output row has a copy button.

How is timestamp conversion handled?

Timestamp parsing and conversion are designed to run in the browser based on the current public implementation. Local time depends on your browser and device time zone settings.

Suggested workflow