Convert Unix timestamps to human-readable dates and back. Multi-timezone.
Convert Unix timestamps (seconds or milliseconds) to human-readable dates and vice versa. Supports multiple timezone conversions. Also shows the current Unix timestamp live.
Upload your file using the tool above.
Adjust any settings to your preference.
Click the process button and wait for results.
Download your output using the download button.
Count the digits. Ten digits is seconds, the Unix standard used by most backends and databases. Thirteen digits is milliseconds, which is what JavaScript’s Date.now() returns. Mixing them is a classic bug — interpreting milliseconds as seconds throws dates tens of thousands of years into the future.
A Unix timestamp is always UTC — it has no timezone attached. The difference you are seeing is your local offset being applied on display. This is why storing timestamps rather than formatted date strings is good practice: one unambiguous value, rendered per user rather than baked in.
Systems storing timestamps in a signed 32-bit integer overflow on 19 January 2038 and wrap to a negative number, reading as 1901. Modern platforms use 64-bit values and are unaffected, but the issue persists in older embedded systems, legacy databases and any schema that pinned the column to a 32-bit type.
Yes, Timestamp Converter is completely free. No signup, no account, and no watermark on outputs. A Pro tier is available for 100 AI ops/day and larger file sizes.
Timestamp Converter runs entirely in your browser. Your file is never uploaded — it is read, processed and saved locally, so it never reaches our servers or anyone else's. You can disconnect from the internet after the page loads and it still works.
Live Unix timestamp
—seconds or milliseconds — auto-detected
Values > 10¹⁰ treated as ms (JavaScript). Smaller values treated as seconds (POSIX).
Auto-detection: Values above 10¹⁰ are milliseconds (JavaScript Date.now()), smaller values are seconds (Unix/POSIX time()). Paste either format — the tool figures it out.
60+ timezones including India: Asia/Kolkata (IST, +05:30) covers all of India — Mumbai, Delhi, Bangalore, Kolkata. It has no DST. Nepal is Asia/Kathmandu (+05:45). Browse all zones under World Clocks, filtered by region.
Compare Zones: Click any city badge to toggle it in the comparison table. Up to 8 zones simultaneously. Set a custom reference time to see how a past/future moment appears in each timezone.
The 2038 problem: 32-bit signed integers overflow at Unix timestamp 2,147,483,647 — January 19, 2038. All modern 64-bit systems, databases, and languages handle dates well beyond this.