Convert a Unix timestamp (epoch) to a date and back — with local time, UTC and the current timestamp in real time.
Choose the conversion
Timestamp → date or date → timestamp. Recognizes seconds (10 digits) and milliseconds (13 digits).
Precise calendar calculations. Everything is computed instantly in your browser, no account, no data sent. Leap years and Gregorian calendar rules are handled.
The Unix timestamp counts the seconds elapsed since 1 January 1970, 00:00 UTC. Conversion works both ways, automatically recognizing seconds (10 digits) and milliseconds (13 digits):
The timestamp 1767225600 = 1 January 2026, 00:00 UTC. Conversely, that date gives the timestamp 1767225600.
It is the number of seconds elapsed since 1 January 1970 at 00:00 UTC (the Unix epoch). For example, 1767225600 corresponds to 1 January 2026, 00:00 UTC.
Enter the number of seconds and the calculator shows the matching date and time, in local time and in UTC.
Choose the “Date → timestamp” mode, enter the date and time, and the result is the number of seconds since 1970.
The classic Unix timestamp is in seconds (10 digits), but JavaScript uses milliseconds (13 digits). The calculator recognizes both formats automatically.
It is the reference moment from which time is counted in most computer systems: 00:00:00 UTC, 1 January 1970.
The calculator shows the current timestamp in real time, which you can copy with one click.
A timestamp represents an absolute moment, independent of time zone. The calculator also shows it in your local time and in UTC for clarity.
Programming, databases, logs, APIs and anywhere a moment in time must be expressed as a single number.