Who this helps
- Developers reading logs and API responses
- People comparing a timestamp with a scheduled date
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.
Convert Epoch values without mixing seconds and milliseconds
Convert a timestamp to local time, UTC, Korea time and ISO 8601, or convert a chosen date back to seconds and milliseconds. Always check the unit used by the source system before relying on automatic detection.
When to use this tool
- Read a JavaScript millisecond timestamp.
- Create a UTC timestamp for an API example.
From input to a checked result
- 1
Enter the timestamp and select seconds, milliseconds, microseconds or automatic detection.
- 2
Compare the UTC, local and ISO results.
- 3
For date-to-timestamp conversion, choose local or UTC interpretation before converting.
- 4
Use the current-time button to fill the selected interpretation.
Epoch origin
- Input
- 0 · seconds
- Result
- 1970-01-01T00:00:00.000Z 1970-01-01 09:00:00 in Korea
Both displays describe the same instant.
Equivalent units
- Input
- 1716000000 seconds 1716000000000 milliseconds
- Result
- 2024-05-18T02:40:00.000Z for both
A millisecond timestamp is 1000 times the corresponding second timestamp.
How it works
Values are normalized to JavaScript milliseconds. Automatic detection treats 16 or more integer digits as microseconds, 13 or more as milliseconds, and shorter values as seconds. Microseconds are divided by 1000 and floored. Dates are limited by JavaScript's ±8.64×10^15 millisecond range; numeric input accepts up to 30 characters after removing commas and outer whitespace.
Limitations
- Digit-count detection is a guess and can misread old dates or very large second values.
- Sub-millisecond precision is not retained; very large microsecond inputs can also lose integer precision.
- Local time depends on the browser's timezone and daylight-saving rules.
- The date field is limited to years 0001–9999. Epoch conversion does not model leap seconds separately.
Your data
Conversion happens in browser memory without saving the entered timestamp. Copied output includes the converted times, including local-time information.
References
Related tools
- Date Difference Calculator
Compare calendar dates without time-of-day input.
- Markdown Preview
Prepare readable technical notes.
Frequently asked questions
Does the timestamp contain a timezone?
It identifies an instant relative to the Epoch. A timezone is applied when displaying that instant.
Why does automatic detection give an unexpected year?
The unit is inferred from digit count. Select the documented source unit explicitly.
What does Now mean in UTC mode?
It fills the current UTC date and minute. Local mode fills local wall time. The input omits the current seconds, so the converted value is rounded down to that minute.