Timestamp Converter
Instantly convert Unix timestamps to human-readable dates and vice versa. Auto-detects seconds vs milliseconds. All processing runs in your browser.
Unix epoch is January 1, 1970 00:00:00 UTC. Timestamps > 1 000 000 000 000 are treated as milliseconds.
Frequently Asked Questions
- Is this timestamp converter free?
- Yes, 100% free. No account, no limits required.
- Are my timestamps kept private?
- All conversion runs locally in your browser using JavaScript's built-in Date API. Nothing is uploaded to any server.
- What is a Unix timestamp?
- A Unix timestamp (also called epoch time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC. It is widely used in programming because it is timezone-independent and easy to store as a single integer.
- How does the tool detect seconds vs milliseconds?
- If the timestamp value is greater than 1,000,000,000,000 (13+ digits), it is treated as milliseconds. Otherwise it is treated as seconds. This covers all timestamps from 2001 to beyond 2100.
- What formats does it output?
- The converter shows local time (with timezone name), UTC time, ISO 8601 format, and a human-friendly relative time such as '3 days ago' or 'in 2 hours'.
- Does it work on mobile?
- Yes, works on all modern browsers including mobile Safari and Chrome on iOS and Android.