Epoch & Date Converter

Two-way Unix ↔ human time with one-click timezones.

Convert a Unix epoch timestamp to a human date and back, with one-click UTC, EST and local timezones. Free epoch / unix time converter that runs in your…

About Epoch & Date Converter

The Epoch & Date Converter is a free, browser-based tool that converts Unix timestamps to human-readable dates and back, with timezone support. Paste a timestamp in seconds or milliseconds to get ISO 8601, a UTC string, day of week, and the time in your chosen zone, or turn any date into Unix seconds and milliseconds. It also batch-converts a whole list to a CSV. Everything runs locally in your browser, with no uploads and no signup.

How to use Epoch & Date Converter

  1. Pick a timezone in the top bar (Local, UTC, New York, London, Tokyo, or Kolkata) — it applies to every result on the page, and the live 'Now' panel shows current Unix seconds and milliseconds you can copy.
  2. To go timestamp → date, type a Unix timestamp in the left panel and set 'Interpret as' to Auto, Seconds, or Milliseconds; Auto reads 13+ digit numbers as milliseconds. Read off the ISO 8601 (UTC), UTC string, zoned time, day of week, and relative time, then copy any field.
  3. To go date → timestamp, use the right panel's date-time picker, or type a free-text date like '2024-05-20T18:30:00Z' or 'May 20 2024' (free text overrides the picker) to get Unix seconds and milliseconds plus the ISO value.
  4. Click 'Use now' anytime to load the current moment into both converters.
  5. To convert many values at once, open 'Batch convert' and paste one timestamp or date per line; it builds a table with seconds, ms, ISO (UTC), and your zone.
  6. Copy the batch results as CSV or download them as timestamps.csv — the export includes every row even though the table previews the first 200.

Frequently asked questions

Is it free and do I need an account?
Yes, it is completely free with no signup or login. Open the page and start converting.
Are my timestamps or dates uploaded anywhere?
No. All parsing and conversion happen locally in your browser using JavaScript's built-in Date and Intl APIs — nothing is sent to a server, so even sensitive log data stays on your device.
Does it handle both seconds and milliseconds?
Yes. Use the 'Interpret as' toggle to force Seconds or Milliseconds, or leave it on Auto, which treats numbers with 13 or more digits as milliseconds and shorter numbers as seconds. The result panel shows the detected unit so there is no ambiguity.
Which timezones and output formats are supported?
You can view any moment in Local, UTC, New York, London, Tokyo, or Kolkata time. Outputs include ISO 8601 in UTC, a UTC string (toUTCString format), the date in your selected zone, day of week, and a relative time like '2 hours ago'.
What date formats can I type into the date → timestamp box?
Anything JavaScript's Date can parse, such as ISO 8601 ('2024-05-20T18:30:00Z'), or looser strings like 'May 20 2024'. The tool confirms exactly how it parsed your input by showing the resulting ISO value. If a string can't be parsed, it tells you instead of guessing.
Can I convert a large list at once and is there a limit?
Yes. Paste up to 5,000 lines (mixing timestamps and dates) into Batch convert to get a results table and a CSV export. The on-screen table previews the first 200 rows, but the copied or downloaded CSV includes all of them, with any unparseable lines flagged.

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