Unix Timestamp Converter
Convert epoch timestamps and dates locally with clear UTC and local time output.
Unix timestamp conversion without sending data anywhere
A Unix timestamp is the number of seconds since 1 January 1970 at 00:00:00 UTC. Use this converter to move between epoch seconds or milliseconds and readable dates locally in your browser.
Seconds, milliseconds and time zones
Seconds are shorter values; milliseconds have three extra digits. Auto detection uses the magnitude of a modern timestamp, and the detected unit is shown. UTC is consistent across systems, while local time follows your device time zone and daylight saving rules.
Before the epoch
Negative timestamps represent dates before 1 January 1970. They are supported when the browser’s date range supports them.
Privacy and limits
No values are uploaded, stored or synced. Results depend on the browser date range and your selected UTC or local interpretation.
FAQ
What is epoch zero?
It is 1970-01-01 00:00:00 UTC, represented by timestamp 0.
Why can local and UTC output differ?
Local output applies the time zone configured on your device; UTC does not.
Does daylight saving time matter?
Yes. Local conversions use the browser’s time-zone rules, including daylight saving changes.