Unix Timestamp Converter
Convert Unix timestamps (seconds or milliseconds) to human dates in local time, UTC and ISO — and dates back to epoch seconds. Copyable, live “now” button.
Timestamp → date
Date → timestamp
About the epoch
A Unix timestamp counts seconds since 1970-01-01 00:00:00 UTC, ignoring leap seconds. Values of 10–11 digits are treated as seconds, 12–14 as milliseconds (the split sits around the year 33658, so both interpretations are unambiguous for practical dates). Negatives map to dates before 1970. The local row reflects your device timezone; the ISO row is always UTC with the Z suffix.
How to use Unix Timestamp Converter
Type an epoch value — seconds or milliseconds are auto-detected from magnitude — and the tool answers with local time, UTC and ISO 8601 in one view, plus the current timestamp as a live reference. The reverse path works too, and the date picker makes future timestamps easy to generate.
Paste multi-line logs and every recognized timestamp translates line by line — the fast way to correlate an outage window across logs written in different units. The classic pitfalls are visible before they bite: 10 vs 13 digit values, time-zone interpretation and Excel serial dates that look like timestamps.
Frequently asked questions
What is a Unix timestamp?
The number of seconds elapsed since 1970-01-01 UTC. It is how most databases, log systems and protocols store time — immune to time zones and daylight saving shifts.
Does the tool support milliseconds?
Yes. 13-digit values are auto-detected as milliseconds and 10-digit values as seconds; conversion targets include ISO-8601, JavaScript Date strings and readable local time.
Why do my dates come out wrong in other tools?
The usual cause is mixing up seconds and milliseconds, which produces dates near 1970 or far into the future. Cross-check the digit count with this converter first.
Can I batch convert timestamps?
Yes. Paste one timestamp per line and all values convert at once, preserving order — a fast path while debugging server logs and trace exports.