Developer Tools
Unix Timestamp Converter
Convert Unix timestamps to dates, dates to timestamps, calculate date math, and find timestamp differences.
Your files stay on your device - processed locally via WebAssembly, never uploaded
Current Unix Timestamp
1781270061
Milliseconds: 1781270061000
Timestamp to Date
Date to Timestamp
Date Math
Timestamp Difference
Start timestamp
End timestamp
Common Timestamps
Unix Epoch
Jan 1, 1970 00:00:00 UTC
Y2K
Jan 1, 2000 00:00:00 UTC
Y2K38 / 32-bit overflow
Jan 19, 2038 03:14:07 UTC
Now (live)
Updates every second
All conversions run entirely in your browser. No data is sent to any server.
Embed this tool on your website
Copy this code to add the Unix Timestamp Converter to your site for free. It runs entirely in your visitors' browsers - no API key, no usage limits.
<iframe src="https://optipix.art/embed/unix-timestamp-converter" width="100%" height="600" style="border:1px solid #e4e4e7;border-radius:8px;" title="Unix Timestamp Converter by OptiPix" loading="lazy"></iframe> <p style="font-size:12px">Free tool by <a href="https://optipix.art/unix-timestamp-converter">OptiPix Unix Timestamp Converter</a></p>
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About Unix Timestamp Converter
Last updated: May 2026
OptiPix Unix Timestamp Converter is a comprehensive tool for working with Unix timestamps entirely in your browser. The live display shows the current Unix timestamp updating every second. Convert any timestamp (auto-detecting seconds vs milliseconds) to Local, UTC, ISO 8601, and relative ('2 hours ago') formats. Pick any date and time with a timezone selector and get back the Unix timestamp in seconds and milliseconds - with quick-date buttons for Now, Start of today, Start of week, Start of month, and Start of year. Date Math adds or subtracts seconds, minutes, hours, days, weeks, months, or years from any timestamp. The Timestamp Difference calculator takes two timestamps and returns a full duration breakdown. A reference table covers Unix Epoch, Y2K, the 32-bit overflow date, and the live current value. Copy buttons on every output make results easy to paste anywhere.
How It Works
The tool uses the browser's native JavaScript Date API for all conversions. Timestamps are parsed and formatted with toLocaleString, toUTCString, and toISOString. Relative time is computed by comparing against Date.now(). Date Math uses Date.setMonth and setFullYear for calendar-aware month and year arithmetic. The live clock runs on a 1-second setInterval.
Use Cases
- •Debug API responses containing Unix timestamps
- •Convert database epoch values to readable dates
- •Calculate expiry times and token lifetimes
- •Determine how many days between two events
- •Quickly look up well-known epoch reference values
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Frequently Asked Questions
What is a Unix timestamp?
How does auto-detection of seconds vs milliseconds work?
What is the Y2K38 problem?
Can I calculate the difference between two timestamps?
Is my data sent to a server?
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Unix Timestamp Converter
Convert between Unix timestamps and human-readable dates with live clock and date math.