Unix timestamp converter

How to use this tool

Convert seconds, milliseconds and ISO dates.

Paste or enter your content. The result updates as you type. Choose an option only when you need to change the default.

Common 10-digit seconds and 13-digit milliseconds are detected automatically. Unusual lengths require a unit. Dates without an offset use the selected timezone; repeated or nonexistent daylight-saving times are rejected.

Example input

1793577600

Local processing

Your input stays in this browser. Drafts are kept in page memory while switching tools, and disappear on reload.

Text is limited to 1 million characters. Regex runs in a worker, capped at 200,000 characters, 1,000 matches and 1.5 seconds. Inputs above 100,000 characters use manual refresh.

The first page load and on-demand modules require network access. A complete offline cache is not included.