Timestamp Converter
Convert between Unix timestamps and human-readable dates. Supports seconds and milliseconds.
A Unix timestamp is the number of seconds (or milliseconds) since 1 January 1970 UTC — the way computers commonly store time. This tool converts between timestamps and human-readable dates in both directions, showing UTC, local time, ISO 8601, and a relative “time ago.” Paste a timestamp or a date string to convert it instantly, all in your browser.
Frequently asked questions
What is a Unix timestamp?
A count of seconds since the Unix epoch, 1 January 1970 at 00:00 UTC. It’s a timezone-independent way to represent a moment in time.
Seconds or milliseconds?
Unix time is usually in seconds (10 digits today), but JavaScript and many APIs use milliseconds (13 digits). This tool detects and handles both.
What is ISO 8601?
An international date-time format like 2024-01-31T12:00:00Z that sorts naturally and avoids regional ambiguity.
Why does local time differ from UTC?
UTC is the global reference; local time applies your timezone’s offset, so the two differ by hours depending on where you are.
What is the year-2038 problem?
Systems storing Unix time in a signed 32-bit integer overflow in January 2038. Modern 64-bit time avoids it.