Decoded
Enter an epoch or pick a datetime.
Unix timestamp converter
Epoch seconds or milliseconds ↔ UTC and local datetimes—ideal for logs and APIs.
How epoch conversion works
Unix time counts seconds (traditionally) from 1970-01-01T00:00:00Z. APIs often use milliseconds—use the toggles to interpret pasted numbers correctly.
Privacy
Conversion happens locally in your tab.
Frequently asked questions
Seconds or milliseconds?
Use the toggle—values above roughly ten billion are treated as milliseconds when auto-detect is on.
Timezone used for local time?
Your browser’s local timezone.
Is anything uploaded?
No.
Leap seconds?
Unix time commonly ignores leap seconds at display—fine for developer debugging.