Unix Timestamp Converter
Convert between Unix epoch time and human-readable dates.
seconds since Jan 1, 1970 UTC â click to copy
Unix Timestamps Explained
A Unix timestamp is the number of seconds that have elapsed since the Unix epoch â 00:00:00 UTC on 1 January 1970. Because it is a single integer in UTC, it is the most portable, unambiguous way to store and exchange a moment in time across systems and time zones.
Seconds vs. milliseconds
Unix time is traditionally measured in seconds (10 digits today), but JavaScript and many APIs use milliseconds (13 digits). This converter detects 13-digit values and treats them as milliseconds automatically.
Why use epoch time?
- No time-zone ambiguity â it is always UTC
- Trivial to compare and sort
- Compact to store as a single number
- Native support in virtually every language
The year 2038 problem
Systems that store Unix time in a signed 32-bit integer will overflow on 19 January 2038, when the value exceeds 2,147,483,647. Modern systems use 64-bit integers, which pushes the limit billions of years into the future, but legacy code may still need attention.
100% Private & Processed Locally
All conversions use your browser's own clock and time-zone settings and run entirely on your device. Nothing is sent to a server.
Frequently Asked Questions
Common questions about the Unix Timestamp Converter.