Timestamp Converter
Convert between Unix timestamps and human-readable dates with timezone support and relative time display.
About This Tool
The Timestamp Converter translates between Unix timestamps and human-readable dates. A Unix timestamp (also called Epoch time or POSIX time) is the number of seconds that have elapsed since January 1, 1970, 00:00:00 UTC. It is the most common way to represent time in APIs, databases, log files, and programming languages.
The tool displays a live current timestamp that updates every second, in both seconds and milliseconds format. You can toggle between the two units depending on whether your system uses second-precision (most Unix tools, many APIs) or millisecond-precision (JavaScript, Java).
The Timestamp → Date section converts any numeric timestamp into multiple formats: local time (using your browser's timezone), UTC, ISO 8601, and a relative description (e.g., "3 days ago" or "2 hours from now"). The Date → Timestamp section uses a native date-time picker that converts your selected date into Unix seconds, milliseconds, ISO 8601, and relative time.
All conversions happen client-side using JavaScript's native Date API. No data is sent to any server, and the timezone is determined by your browser.
How to Use
- View the Current Timestamp panel to see the live Unix time in seconds and milliseconds. Click the copy icon to copy either value.
- Toggle between Seconds and Milliseconds units.
- To convert a timestamp to a date, enter it in the Timestamp → Date input. Click Now to prefill the current timestamp.
- To convert a date to a timestamp, use the date-time picker in the Date → Timestamp section. Click Now to prefill the current date and time.
- Copy any result by clicking the copy icon next to it. Press Ctrl+Shift+C to copy the current Unix timestamp.
FAQ
What is a Unix timestamp?
A Unix timestamp is the number of seconds since the Unix Epoch — January 1, 1970, 00:00:00 UTC. It provides a timezone-independent way to represent a moment in time. Most programming languages and databases support it natively.
Should I use seconds or milliseconds?
It depends on your system. Most Unix/Linux tools, Python, and many REST APIs use seconds. JavaScript, Java, and some modern APIs use milliseconds. If your timestamp is around 10 digits, it's seconds. If it's 13 digits, it's milliseconds.
What timezone does this tool use?
The "Local" format uses your browser's timezone. UTC and ISO 8601 outputs are always in UTC. Unix timestamps themselves are timezone-independent.
What is the Year 2038 problem?
Systems using a 32-bit signed integer for Unix timestamps will overflow on January 19, 2038. Modern 64-bit systems are not affected. JavaScript uses 64-bit floats, so this tool handles dates far beyond 2038.
Is my data safe?
Yes. All conversions run locally in your browser. No data is sent to any server.
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