What is a Unix timestamp?
A Unix timestamp (or epoch time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC, not counting leap seconds. It's a common way for software to store dates as a single number.
FAQ
Unix Timestamp / Epoch Converter FAQ
How do I know if my timestamp is in seconds or milliseconds?
A 10-digit number (like 1700000000) is typically seconds; a 13-digit number (like 1700000000000) is typically milliseconds. Use the unit selector to switch between them — the converter also auto-detects based on digit count.
Does this tool account for time zones?
Yes. Results show both the UTC time and your browser's local time zone side by side, so you can see exactly how a timestamp maps to your local clock.
Is any of this sent to a server?
No. All conversion happens locally in your browser using JavaScript's built-in Date object — nothing is uploaded or transmitted anywhere.