Free Unix Timestamp Converter Tool Online
Convert Unix timestamps to readable dates and back with support for seconds, milliseconds, UTC, and local time zones.
IN: Timestamp or date · OUT: Date or timestamp · RUNS: 100% in your browser
UTC: Fri, 10 Jul 2026 14:22:05 GMT
ISO 8601: 2026-07-10T14:22:05.000Z
Local: 2026-07-10 19:52:05
Frequently asked questions
What is a Unix timestamp?+
A Unix timestamp counts the number of seconds (or milliseconds) that have elapsed since 00:00:00 UTC on January 1, 1970 — known as the Unix epoch. It's a compact, timezone-independent way to store a point in time.
How do I know if my timestamp is in seconds or milliseconds?+
Timestamps in seconds are typically 10 digits (for dates in the 2000s-2030s), while millisecond timestamps are 13 digits. Toggle the unit switch above the input if your converted date looks wrong by a factor of 1000.
Does this tool account for timezones?+
The tool shows both the UTC representation and your browser's local time, converted automatically using your device's timezone settings. Unix timestamps themselves are always timezone-independent.
Can I convert a specific date back into a timestamp?+
Yes, use the date-to-timestamp section: pick or type a date and time, and the tool immediately shows the equivalent Unix timestamp in both seconds and milliseconds.
Why do some systems use seconds and others milliseconds?+
It depends on the platform's precision needs and history. Unix and most POSIX systems use seconds; JavaScript's Date object and many web APIs use milliseconds for finer-grained timing.
Is there a maximum date this tool can handle?+
It relies on JavaScript's Date object, which supports dates roughly between the years 271,821 BC and 275,760 AD, far beyond any practical use case.
Does this tool send my timestamp anywhere?+
No, all conversion happens locally in your browser using standard JavaScript Date methods — nothing is transmitted to a server.