Question 1

What is a Unix timestamp?

Accepted Answer

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 widely used in programming and databases to represent dates and times.

Question 2

What's the difference between seconds and milliseconds timestamps?

Accepted Answer

A seconds timestamp has 10 digits (e.g., 1709913600), while a milliseconds timestamp has 13 digits (e.g., 1709913600000). JavaScript's Date.now() returns milliseconds, while many APIs use seconds.

Question 3

What is the Year 2038 problem?

Accepted Answer

Systems that store Unix timestamps as 32-bit signed integers will overflow on January 19, 2038. This is similar to the Y2K problem. Most modern systems use 64-bit integers, which won't overflow for billions of years.

Unix Timestamp Converter

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