Unix Timestamp Converter – Epoch ↔ Date
Convert between Unix epoch time and readable dates instantly.
- Free
- Instant result
- Private · on-device
- No sign-up
How to use: Paste a timestamp or pick a date-time. See UTC and local conversions both ways.
How to use the Unix Timestamp Converter
Paste a Unix timestamp (seconds or milliseconds since 1970-01-01 UTC) to see the matching UTC and local date-time, or pick a date-time to generate the timestamp. The converter detects millisecond values when the number is large enough.
Unix time is widely used in APIs, logs, databases, and JWT expiry claims. Converting both directions helps debug “off by one hour” timezone bugs and confirms whether a value is in seconds or milliseconds.
All absolute instants are stored in UTC; your browser zone is used only for the local display. For comparing zones explicitly, open the timezone converter afterward.
Leap seconds are ignored in typical Unix time libraries, matching common programming languages. Do not use this for legal timekeeping that requires leap-second awareness.
Developers can verify cron schedules, cookie expiries, and log lines quickly. Share the ISO string with teammates who prefer human-readable dates. Copy the ISO-8601 string into tickets or docs when you need a timezone-safe instant that humans can still read.
Frequently asked questions
What is a Unix timestamp?
The number of seconds (or ms) since the Unix epoch, 1 Jan 1970 UTC.
Seconds or milliseconds?
Classic Unix time is seconds; JavaScript Date.now() uses milliseconds — pick the matching unit.
What about leap seconds?
Most systems ignore leap seconds in Unix time.
Can I convert dates before 1970?
Yes — negative timestamps represent earlier moments in many systems.