Convert Unix timestamps, ISO and RFC dates live in any time zone, plus date arithmetic
Current timeThursday, October 22, 2026 at 03:15:49 AM UTC
About Unix timestamps
What is a Unix timestamp?
The number of seconds since January 1, 1970 at 00:00:00 UTC. It is timezone-independent, easy to compare and store, and used by databases, APIs, logs and most languages.
Seconds vs milliseconds
Ten-digit values are seconds, thirteen-digit values are milliseconds. JavaScript's Date.now() returns milliseconds. Both fields above accept either.
Time zones
Unix, ISO and RFC 2822 values are absolute. Only the “Date & time” row and the date-math calendar arithmetic depend on the selected zone.
Year 2038 problem
32-bit signed Unix time overflows on January 19, 2038. Modern 64-bit systems extend the range to billions of years.