Unix timestamp converter
Paste a timestamp or a date and see both local time and UTC side by side β plus ISO 8601. Auto-detects seconds vs milliseconds, which is the part people usually get wrong.
Runs entirely in your browser. Nothing is uploaded or stored.
Either direction. Seconds (10 digits) and milliseconds (13 digits) are auto-detected.
FAQ
Seconds or milliseconds?
Both. 10 digits is treated as seconds, 13 as milliseconds β that's the convention in virtually every API.
Why do I see two times?
Because servers store UTC while you think in local time. Showing both is how you spot an off-by-hours bug in one glance.
What date formats can I type?
2026-10-11 12:30:45, 2026/10/11, 2026-10-11T12:30 and similar β slashes are accepted and converted.