Timestamp Converter
Current Unix (sec): ...Current Unix (ms): ...
Last updated: 2026 · Free online tool
What is Timestamp Converter?
Free online tool to convert between Unix timestamps and dates in both directions. It accepts seconds (10 digits) and milliseconds (13 digits), and supports timezones like KST, JST, UTC plus ISO 8601 and relative time.
How to Use
- 1Select conversion direction— Choose 'Timestamp → Date' or 'Date → Timestamp'.
- 2Select unit and timezone— Choose seconds or milliseconds, then select your desired timezone.
- 3Enter value— Enter a timestamp or date and it will be converted automatically.
- 4Check results— View ISO 8601, UTC, local time, relative time, day of week, leap year, and more.
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Frequently Asked Questions
Seconds are 10 digits (e.g. 1700000000), milliseconds are 13 digits (e.g. 1700000000000). JavaScript's Date.now() returns milliseconds.
Over 10 major timezones including KST, JST, US Eastern/Western, GMT, CET, and UTC.
ISO 8601 (2025-01-15T12:00:00Z), date only (2025-01-15), RFC 2822, and any format parseable by JavaScript Date.
A display format like '3 hours ago' or '2 days from now' based on the current time.
No. All conversions happen in your browser.