Zest.

Unix timestamp converter

A Unix timestamp counts the seconds since 1 January 1970 UTC. Many systems also use milliseconds, which adds three digits. Paste either and Zest tells which it is and shows the date in ISO 8601, UTC and your local time.

Unix timestamp 17000000002023-11-14 22:13:20 UTC3 years ago
Unix (seconds)
1700000000
Unix (milliseconds)
1700000000000
ISO 8601
2023-11-14T22:13:20.000Z
UTC
Tue, 14 Nov 2023 22:13:20 GMT
Your time zone
Tuesday, November 14, 2023 at 10:13:20 PM UTC

How to use it

  1. Paste a 10 digit (seconds) or 13 digit (milliseconds) timestamp.
  2. Read the date in several formats.
  3. Copy the format you need.

This tool is also built into Zest search, so you can type your question into the search box and get the same answer above the results.

Common questions

How can I tell seconds from milliseconds?
Current timestamps in seconds have 10 digits and in milliseconds have 13. Zest picks the unit from the size of the number.
What is the year 2038 problem?
Systems that store seconds in a signed 32-bit integer overflow on 19 January 2038. Modern systems use 64-bit values, which last far longer.