What is a Unix timestamp?

A Unix timestamp is the number of seconds elapsed since January 1, 1970 00:00:00 UTC (the Unix epoch). It's a universal way to represent time in computing.

What's the difference between seconds and milliseconds?

Unix timestamps in seconds are 10 digits (e.g., 1700000000), while milliseconds are 13 digits (e.g., 1700000000000). JavaScript uses milliseconds, most systems use seconds.

Does this tool handle timezones?

Yes. The tool shows both UTC and your local timezone when converting timestamps, so you can see the exact time in both.

Unixタイムスタンプ変換

Unixタイムスタンプを日付に、日付をタイムスタンプに変換。

Current Unix Timestamp

1770559369

Timestamp → Date

Date → Timestamp

About Unix Timestamps

A Unix timestamp represents the number of seconds since January 1, 1970 (UTC). It's widely used in programming, databases, and APIs. This tool auto-detects whether the input is in seconds or milliseconds.

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How to Use

Enter a Unix timestamp to convert to a human-readable date
Or enter a date string to convert to a Unix timestamp
The tool auto-detects seconds vs milliseconds
View results in UTC, local time, and ISO format

Common Use Cases

Converting API timestamps to readable dates
Debugging date-related issues
Comparing timestamps across systems
Working with JWT token expiration times