Date & Time

Unix Timestamp Converter

Convert Unix timestamps and readable dates across zones.

Processed locally in your browser

Current Unix time

Milliseconds: 0

Unix timestampTimestamp unitPreview time zone

Time-zone output uses this browser’s IANA database. Server runtimes may use different zone data or defaults.

Converted date and time

Convert a timestamp or date to see every supported format.

Current Unix time

Milliseconds: 0

Unix timestampTimestamp unitPreview time zone

Time-zone output uses this browser’s IANA database. Server runtimes may use different zone data or defaults.

How to use this tool

Select timestamp-to-date or date-to-timestamp mode.
Choose automatic detection, seconds, or milliseconds where applicable.
Select a time zone for previews and wall-clock date conversion.
Copy any individual output or pause the live clock when comparing values.

Examples

Unix epoch

Use 0 seconds to inspect 1 January 1970 in every format.

Before 1970

Negative timestamps correctly represent dates before the epoch.

Frequently asked questions

How does automatic unit detection work?

Absolute values of 100 billion or more are treated as milliseconds; smaller values are treated as seconds. Select the unit manually for unusual historical values.

What is the Year 2038 problem?

Some older systems store Unix seconds in a signed 32-bit integer, which overflows on 19 January 2038. JavaScript dates and this converter are not limited to that 32-bit range.

About this tool

Convert Unix seconds, milliseconds, and zoned wall-clock dates into local, UTC, ISO 8601, RFC 2822, relative, and epoch formats entirely in the browser.

Frequently asked questions

How does automatic unit detection work?

Absolute values of 100 billion or more are treated as milliseconds; smaller values are treated as seconds. Select the unit manually for unusual historical values.

What is the Year 2038 problem?

Some older systems store Unix seconds in a signed 32-bit integer, which overflows on 19 January 2038. JavaScript dates and this converter are not limited to that 32-bit range.