Tools / Development

Unix Timestamp Converter

Convert between Unix timestamps and dates, and see the local, UTC, and ISO 8601 formats at once.

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Current time1788138532

Unix timestamp

Automatically detects seconds or milliseconds.

Local time8/31/2026, 1:08:52 AM

UTCMon, 31 Aug 2026 01:08:52 GMT

ISO 86012026-08-31T01:08:52.000Z

Date/time

Seconds1788138532

Milliseconds1788138532000

Need to count down to a date? Try the D-day Calculator.

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Tool info

Category Development

Processing Directly in your browser

Data storage Not stored

Updated 2026-08-21

How to use

Enter a timestamp — seconds or milliseconds are detected automatically and converted to a date.

Pick a date/time directly to get both the second- and millisecond-based timestamps.

Click "Use now" to fill in the current time instantly.

Copy the value you need with the button next to it.

FAQ

자주 묻는 질문

Q1. What is a Unix timestamp?

A Unix timestamp is a number representing the seconds (or milliseconds) elapsed since the epoch — January 1, 1970, 00:00:00 UTC. It lets a single number express a point in time independent of time zone, which is why servers and databases use it so widely.

Q2. How does the tool tell seconds and milliseconds apart?

If the entered number is 10^12 or larger it's treated as milliseconds, otherwise as seconds. JavaScript defaults to milliseconds while most server languages default to seconds, which is a common source of confusion.

Q3. What's the difference between local time and UTC?

Local time follows the time zone set in your browser (for example KST, UTC+9), while UTC is Coordinated Universal Time with no offset applied. Server logs and API responses usually use UTC or ISO 8601.

Q4. Where is the ISO 8601 format used?

It's a standardized format like 2026-08-21T09:00:00.000Z that orders year-month-day and hour:minute:second consistently. REST APIs, log files, and JSON data exchange rely on it to avoid time zone ambiguity.

Q5. Can it convert negative timestamps?

Yes. Negative values, which represent times before January 1, 1970, convert to dates correctly.

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