How are 10-digit and 13-digit values distinguished?

Ten digits is Unix time in seconds; thirteen is milliseconds. JavaScript's Date.now() returns milliseconds, while Unix commands and many APIs use seconds. This tool decides by the number of digits.

Which time zone do the results use?

A Unix timestamp is an absolute instant with no time zone of its own. This tool shows that same instant in your device's time zone, in UTC, and in Korea Standard Time (UTC+9).

Which zone is the date field interpreted in?

The date and time picker uses your device's time zone.

What about dates before 1970?

The timestamp field accepts positive numbers only, so it covers 1 January 1970 onward. For earlier moments use the date picker, which will produce a negative timestamp.

Where does the current time come from?

Straight from your device's clock. If that clock is wrong, the displayed value will be wrong by the same amount.

Unix Timestamp Converter - Timestamp to Date and Back

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Developer Tools

Current time

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Timestamp → date

Date → timestamp

Timestamp converter features

Unix Timestamp Converter — tells 10-digit (seconds) and 13-digit (milliseconds) values apart by length and converts either one. Results appear in your own time zone, UTC, Korea Standard Time and ISO 8601 together, so there is no offset arithmetic to do. The reverse direction works too: pick a date and time and get the matching second and millisecond timestamps. The current time updates every second and can be copied or dropped straight into the input.

How to use

1. To read a timestamp, paste the number into the input — seconds and milliseconds are detected by length. 2. Your time zone, UTC, KST and ISO 8601 values appear below; click any row to copy it. 3. To go the other way, pick a date and time in the lower field. 4. For the current moment, copy the value at the top or press "Use current time".

When to use it

• Find out what a createdAt or expiresAt value in an API response really means • Convert server log timestamps into local time • Check when a JWT exp claim falls due • Produce a timestamp for a specific moment in tests • Line up log times with a team in another time zone

Frequently Asked Questions

Q. How are 10-digit and 13-digit values distinguished?: A. Ten digits is Unix time in seconds; thirteen is milliseconds. JavaScript's Date.now() returns milliseconds, while Unix commands and many APIs use seconds. This tool decides by the number of digits.
Q. Which time zone do the results use?: A. A Unix timestamp is an absolute instant with no time zone of its own. This tool shows that same instant in your device's time zone, in UTC, and in Korea Standard Time (UTC+9).
Q. Which zone is the date field interpreted in?: A. The date and time picker uses your device's time zone.
Q. What about dates before 1970?: A. The timestamp field accepts positive numbers only, so it covers 1 January 1970 onward. For earlier moments use the date picker, which will produce a negative timestamp.
Q. Where does the current time come from?: A. Straight from your device's clock. If that clock is wrong, the displayed value will be wrong by the same amount.