Unix timestamp converter
From timestamp to date and back, with seconds/milliseconds, UTC and local time. Computed in your browser.
Genuinely free. No sign-up, no email, no limits, no cookies. We don't store the URL you analyse.
Enter a timestamp or pick a date.
What this tool cannot see
The local time shown is your browser's: if you need a specific zone other than yours, bear that in mind. The calculation is deterministic and runs entirely on your device.
Why it's handy
Unix timestamps are everywhere in development work: in database fields, in token claims («exp», «iat»), in logs, in API responses. Reading them at a glance isn't easy. This tool translates them into readable dates, in both formats and both zones, and does the reverse too.
Handy alongside the JWT decoder and the Base64 converter.
Frequently asked questions
›What is a Unix timestamp?
It's the number of seconds since midnight UTC on 1 January 1970 (the «epoch»). It's the most common way to represent an instant in time independently of time zone, used in databases, APIs and logs.
›Seconds or milliseconds?
Both are common: Unix and most languages use seconds, JavaScript uses milliseconds. The tool detects the format automatically from the size of the number (above roughly 10^12 it treats it as milliseconds) and tells you which.
›Does the calculation account for my time zone?
Yes. We show the instant both in UTC and in your local time (your browser's zone), so you see both readings unambiguously. Converting from a date to a timestamp uses the local time you enter.