TOOL
Unix Timestamp Converter
Convert an epoch timestamp to a readable date and back. Seconds or milliseconds, UTC and local.
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How to use it
The current Unix time updates live at the top. Enter a timestamp (in seconds or milliseconds) to see the UTC and local date, or enter a date to get the timestamp. The tool detects whether a number is seconds or milliseconds by its size.
Where you meet epoch time
Log files, NTP-synchronised systems, API responses, rate-limit reset headers (429), cookie expiry and JWT claims all use Unix time because it is compact and free of timezone ambiguity. Converting it to a readable date is a constant need when reading logs. Accurate conversion depends on the system clock being correct, which is what NTP maintains.
Frequently asked questions
What is a Unix timestamp?
The number of seconds since 1 January 1970 00:00:00 UTC (the Unix epoch), ignoring leap seconds. It is a compact, timezone-free way to store a moment in time, used throughout computing and in many logs and APIs.
Seconds or milliseconds?
Unix time is classically in seconds (10 digits around now). JavaScript and many APIs use milliseconds (13 digits). This tool detects the magnitude and shows both interpretations when ambiguous.