Question 1

What is a Unix timestamp?

Accepted Answer

It's the number of seconds elapsed since the Unix epoch, 1970-01-01T00:00:00 UTC. A negative timestamp represents a moment before that date. It's the standard way most systems store dates internally because it's a single, timezone-independent number.

Question 2

Why do some timestamps have 13 digits instead of 10?

Accepted Answer

A 10-digit number is almost always seconds; a 13-digit number is the same value in milliseconds (JavaScript's Date.now() and many APIs use milliseconds). This tool detects which one you've pasted automatically from its length, and you can override it if it guesses wrong.

Question 3

How does the timezone conversion handle daylight saving time?

Accepted Answer

It reads the actual time zone database for the exact instant you're converting, so a date in spring converts using standard time and a date in summer uses daylight time automatically - and the offset flips at the correct moment on the transition day itself.

Question 4

Does this tool send my dates or timestamps anywhere?

Accepted Answer

No. Every conversion - timestamp to date, date to timestamp, and the live clock - runs with your browser's own built-in date and time APIs. Nothing is ever uploaded.

Question 5

Can I convert a date before 1970?

Accepted Answer

Yes. Unix time simply goes negative for anything before 1970-01-01T00:00:00 UTC, and this tool supports negative timestamps in both directions.

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Unix Timestamp Converter

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