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Convert Unix timestamps (epoch time) to human-readable dates and back with this free online converter. Supports seconds and milliseconds. See the current timestamp updating in real time.
On this page
How to Use#
- Timestamp → Date: Enter a Unix timestamp to see the full date in UTC, local time, and ISO format
- Date → Timestamp: Pick a date/time to get the Unix timestamp in seconds and milliseconds
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. It's the universal time representation used in programming because it's timezone-independent and easy to calculate with.
Common Timestamps#
0— January 1, 1970 (Unix epoch)1000000000— September 9, 20012000000000— May 18, 2033 (Y2K38 approaches)2147483647— January 19, 2038 (32-bit overflow, "Y2K38 bug")
Seconds vs Milliseconds#
- 10 digits (e.g. 1715000000) = seconds (standard Unix)
- 13 digits (e.g. 1715000000000) = milliseconds (JavaScript Date.now())
Privacy#
This converter runs 100% in your browser. No timestamps are logged or sent anywhere.
Recommended Reading#
- Designing Data-Intensive Applications — essential reading for timestamps in distributed systems
- Time and Relational Theory — essential reading for temporal data in databases
- JavaScript: The Good Parts — essential reading for Date objects and timestamps
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