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Developer Utility

Unix Timestamp Converter

Convert Unix timestamps into dates and times, and check the current time in seconds, milliseconds, ISO format, UTC, local time, and KST.

Timestamp → Date Automatically detect seconds, milliseconds, or microseconds and convert the value into a readable date and time.
Date → Timestamp Convert a selected date and time into seconds, milliseconds, and ISO 8601 format.
Current Time Check and copy the current Unix timestamp in real time.

Current Unix Timestamp

View the current time in seconds, milliseconds, and ISO format in real time.

Live
Seconds -
Milliseconds -
ISO 8601 -
Local Time -
UTC Time -
KST Time -

Timestamp → Date Converter

Enter a Unix timestamp and convert it into local, UTC, and KST date/time values.

Enter a Timestamp value and click the convert button.

Date → Timestamp Converter

Select a date and time, then convert it into seconds, milliseconds, and ISO 8601 format.

Select a date and time and click the convert button.

Timestamp Unit Comparison

Unix timestamp units may differ depending on the system or API.

Seconds

Usually a 10-digit number. Commonly used in server logs, Linux timestamps, and some API responses.

Milliseconds

Usually a 13-digit number. Commonly used by JavaScript Date.now() and frontend logs.

Microseconds

Usually a 16-digit number. May be used in high-precision logs or some database timestamp values.

Help

What is a Unix Timestamp?

A Unix timestamp is a numeric value representing the time elapsed since January 1, 1970 00:00:00 UTC. It is commonly used in API logs, database timestamp fields, server scheduling, and browser time calculations.

Features

  • Display the current Unix timestamp in real time
  • Automatically detect seconds, milliseconds, and microseconds
  • Convert timestamps to local time, UTC time, and KST time
  • Convert date and time into seconds, milliseconds, and ISO 8601 format
  • Quick input for current time, 1 hour ago, 1 day ago, and 7 days ago
  • Copy individual result values

Seconds, Milliseconds, and Microseconds

  • Seconds: Usually a 10-digit number. Example: 1716000000
  • Milliseconds: Usually a 13-digit number. Example: 1716000000000
  • Microseconds: Usually a 16-digit number. Example: 1716000000000000
How does auto detection work?

Auto detection estimates the timestamp unit based on the number length. Around 10 digits is treated as seconds, around 13 digits as milliseconds, and around 16 digits as microseconds.

What is the difference between UTC and KST?

UTC is the international standard time. KST is Korea Standard Time, which is 9 hours ahead of UTC. Server logs are often stored in UTC, while Korean services often display time in KST.

What unit does JavaScript Date.now() use?

JavaScript Date.now() returns a timestamp in milliseconds. It is usually a 13-digit number, 1000 times larger than a Unix timestamp in seconds.

When should I use UTC input?

Use UTC input when matching API request values, server schedules, or database timestamps that are based on UTC. For screen display, local time is usually more convenient.

Notice

Displayed dates may vary depending on server, database, browser, and timezone settings. When integrating with an API, always check whether the expected time basis is UTC or local time.