Epoch converter · s / ms / µs / ns · batch · diff · timezones
Every Unix timestamp, decoded.
Convert epoch timestamps at any precision to and from human dates, batch-convert a column from your logs, diff two times, and view any instant across timezones.
Open the converter ↗What it does
Beyond a single seconds conversion, unixstamp auto-detects precision (seconds, ms, µs, ns), batch-converts a pasted log column to ISO 8601, computes the diff between two times, and shows an instant across DST-aware timezones.
Epoch precision, quickly
The classic Unix epoch; what most APIs return.
Used by JavaScript and Java (Date.now()).
Common in databases and some logs.
Used by Go and many tracing systems.
Frequently asked questions
Is unixstamp free?
Yes — completely free, no account, no sign-up. It runs entirely in your browser.
What is a Unix timestamp?
A Unix timestamp (epoch time) is the number of seconds since 1970-01-01 00:00:00 UTC. It’s timezone-independent, which makes it the standard way to store an instant in logs, APIs and databases.
What are milliseconds, microseconds and nanoseconds?
Different systems store the epoch at different precisions: seconds (10 digits today), milliseconds (13, used by JavaScript and Java), microseconds (16, common in databases), and nanoseconds (19, used by Go and many tracing systems). unixstamp auto-detects the precision from the magnitude, and you can force it.
How does auto-detection work?
It looks at how many digits the number has: ~10 → seconds, ~13 → milliseconds, ~16 → microseconds, ~19 → nanoseconds. If a value is ambiguous, use the unit toggle to force seconds/ms/µs/ns.
Can it convert a whole column from a log file?
Yes. Paste a column of timestamps (or dates), one per line, into the batch box and unixstamp converts each to ISO 8601 UTC — handy for cleaning up logs.
Are the timezone conversions accurate across DST?
Yes. The multi-timezone view uses your browser’s IANA timezone database via the Intl API, so daylight-saving transitions are handled correctly for each zone.
Does anything I paste get uploaded?
No. All parsing and conversion happen locally in your browser — there is no backend and nothing is sent anywhere.