Timestamp Converter - Convert Unix Timestamps and Dates Online

Convert Unix timestamps, milliseconds and readable dates in your browser.

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Timestamp Converter helps developers convert Unix timestamps to readable dates and convert dates back into seconds or milliseconds.

It is useful for API debugging, log analysis, database inspection, and test data workflows.

Everything runs locally in the browser with live current time, UTC display, local time, ISO 8601 and relative time.

Common uses for Timestamp Converter

Typical tasks this tool is built for.

Convert API timestamps during debugging.
Inspect log timestamps in seconds or milliseconds.
Generate Unix timestamps from datetime inputs.
Compare UTC and local display values quickly.

How to use Timestamp Converter

Step 1. Choose Timestamp to Date to convert a numeric Unix value, or Date to Timestamp to start from the datetime-local field.
Step 2. For a timestamp, enter a signed numeric value and choose Auto-detect, Seconds, or Milliseconds.
Step 3. Use an explicit unit for a decimal timestamp, because Auto-detect identifies only integer values.
Step 4. For a date, choose the date and minute in the datetime-local input, then select Local time or UTC before converting.
Step 5. Review the Unix seconds, Unix milliseconds, UTC, browser-local, ISO 8601, and relative-time result rows.
Step 6. Use a Copy button beside the value you need, or use the current-time buttons to copy or load the current Unix time.

Why use this tool?

Convert numeric Unix timestamps as seconds or milliseconds into UTC, local, ISO 8601, and relative-time displays.
Convert a datetime-local value back to Unix seconds and Unix milliseconds with a Local time or UTC interpretation.
Use Auto-detect for integer timestamps, or choose Seconds or Milliseconds explicitly when the unit is known.
See a live current-time panel that refreshes each second and can populate the timestamp converter with current Unix seconds.
Copy individual current-time or conversion-result values with the browser clipboard control.

Privacy and formats

Files and inputs stay in your browser during processing.

Input: TextOutput: Processed text

Best results with Timestamp Converter

Practical tips before you download or share the output.

Unix timestamps are usually stored in UTC. Use local time for display only.

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Common problems this tool helps with

Situations where this workflow saves time.

The converter says to enter a valid timestamp - the timestamp field accepts only signed numeric text, not date strings or other labels.

Auto-detect cannot determine the unit - its detection path accepts integer input only; select Seconds or Milliseconds for decimal values.

Seconds and milliseconds produce an unexpected date - choose the unit explicitly when the value’s scale is known instead of relying on the auto-detect heuristic.

The timestamp is out of range - JavaScript Date could not represent the entered millisecond value.

The local-time result differs from another computer - it is formatted by that browser’s current locale and local time zone.

Date-to-timestamp output differs after changing the time-zone option - the Local time and UTC options construct the selected date and minute differently.

You need seconds in the date input - the datetime-local control in this component supplies date and minute fields, not a separate seconds field.

A Copy button does not finish - browser clipboard access may be unavailable or denied; select the displayed value manually if needed.

Frequently asked questions

What timestamp formats can I enter?

Timestamp to Date accepts signed numeric Unix values, including decimal text when Seconds or Milliseconds is selected. It does not parse human-readable dates in that mode.

How does Auto-detect choose seconds or milliseconds?

For an integer value, it chooses milliseconds when the text has at least 13 characters or the numeric magnitude is greater than 9,999,999,999; otherwise it chooses seconds. Decimal input does not pass this detection step.

What does Date to Timestamp accept?

It uses a datetime-local input, which supplies a date and hour-and-minute value. The component then constructs the date as either local time or UTC according to the selected option.

Which result formats are shown?

A successful conversion shows Unix seconds, Unix milliseconds, a UTC display, a browser-local display, an ISO 8601 string, and a relative-time phrase.

Why do the UTC and local results differ?

The UTC row uses the date’s UTC getters, while the Local time row uses the browser’s toLocaleString formatting. The displayed local zone and locale therefore come from the browser environment.

Does the relative-time result stay fixed?

A completed result keeps the relative-time phrase calculated when that conversion ran. The Current time panel updates once per second; run the conversion again to calculate a fresh relative-time value.

Can I use the current time without typing it?

Yes. The Current time panel shows Unix seconds and milliseconds, provides copy buttons for each, and Use current time loads the current Unix seconds into Timestamp to Date.

Are converted values rounded?

The Unix seconds and milliseconds result strings use Math.trunc. A decimal timestamp can therefore display truncated integer seconds and milliseconds after conversion.

Can I download the conversion result?

No download control is implemented. The available output action is copying each displayed result value through the browser clipboard API.

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How to use Timestamp Converter

Step 1. Choose Timestamp to Date to convert a numeric Unix value, or Date to Timestamp to start from the datetime-local field.

Step 2. For a timestamp, enter a signed numeric value and choose Auto-detect, Seconds, or Milliseconds.

Step 3. Use an explicit unit for a decimal timestamp, because Auto-detect identifies only integer values.

Step 4. For a date, choose the date and minute in the datetime-local input, then select Local time or UTC before converting.

Step 5. Review the Unix seconds, Unix milliseconds, UTC, browser-local, ISO 8601, and relative-time result rows.

Step 6. Use a Copy button beside the value you need, or use the current-time buttons to copy or load the current Unix time.

Why use this tool?

Convert numeric Unix timestamps as seconds or milliseconds into UTC, local, ISO 8601, and relative-time displays.

Convert a datetime-local value back to Unix seconds and Unix milliseconds with a Local time or UTC interpretation.

Use Auto-detect for integer timestamps, or choose Seconds or Milliseconds explicitly when the unit is known.

See a live current-time panel that refreshes each second and can populate the timestamp converter with current Unix seconds.

Copy individual current-time or conversion-result values with the browser clipboard control.